1,345 results on '"Kaldor,J"'
Search Results
2. A biological model of scabies infection dynamics and treatment explains why mass drug administration does not lead to elimination
- Author
-
Lydeamore, M., Campbell, P. T., Regan, D. G., Tong, S. Y. C., Andrews, R., Steer, A. C., Romani, L., Kaldor, J. M., McVernon, J., and McCaw, J. M.
- Subjects
Quantitative Biology - Populations and Evolution - Abstract
Despite a low global prevalence, infections with Sarcoptes scabiei, or scabies, are still common in remote communities such as in northern Australia and the Solomon Islands. Mass drug administration (MDA) has been utilised in these communities, and although prevalence drops substantially initially, these reductions have not been sustained. We develop a compartmental model of scabies infection dynamics and incorporate both ovicidal and non-ovicidal treatment regimes. By including the dynamics of mass drug administration, we are able to reproduce the phenomena of an initial reduction in prevalence, followed by the recrudescence of infection levels in the population. We show that even under a `perfect' two-round MDA, eradication of scabies under a non-ovicidal treatment scheme is almost impossible. We then go on to consider how the probability of elimination varies with the number of treatment rounds delivered in an MDA. We find that even with infeasibly large numbers of treatment rounds, elimination remains challenging., Comment: 22 pages, 10 figures
- Published
- 2016
- Full Text
- View/download PDF
3. Opportunities to strengthen respiratory virus surveillance systems in Australia: lessons learned from the COVID-19 response
- Author
-
Shearer, FM, Edwards, L, Kirk, M, Eales, O, Golding, N, Hassall, J, Liu, B, Lydeamore, M, Miller, C, Moss, R, Price, DJ, Ryan, GE, Sullivan, S, Tobin, R, Ward, K, Kaldor, J, Cheng, AC, Wood, J, Mccaw, JM, Shearer, FM, Edwards, L, Kirk, M, Eales, O, Golding, N, Hassall, J, Liu, B, Lydeamore, M, Miller, C, Moss, R, Price, DJ, Ryan, GE, Sullivan, S, Tobin, R, Ward, K, Kaldor, J, Cheng, AC, Wood, J, and Mccaw, JM
- Abstract
Disease surveillance data was critical in supporting public health decisions throughout the coronavirus disease 2019 (COVID-19) pandemic. At the same time, the unprecedented circumstances of the pandemic revealed many shortcomings of surveillance systems for viral respiratory pathogens. Strengthening of surveillance systems was identified as a priority for the recently established Australian Centre for Disease Control, which represents a critical opportunity to review pre-pandemic and pandemic surveillance practices, and to decide on future priorities, during both pandemic and inter-pandemic periods. On 20 October 2022, we ran a workshop with experts from the academic and government sectors who had contributed to the COVID-19 response in Australia on 'The role of surveillance in epidemic response', at the University of New South Wales, Sydney, Australia. Following the workshop, we developed five recommendations to strengthen respiratory virus surveillance systems in Australia, which we present here. Our recommendations are not intended to be exhaustive. We instead chose to focus on data types that are highly valuable yet typically overlooked by surveillance planners. Three of the recommendations focus on data collection activities that support the monitoring and prediction of disease impact and the effectiveness of interventions (what to measure) and two focus on surveillance methods and capabilities (how to measure). Implementation of our recommendations would enable more robust, timely, and impactful epidemic analysis.
- Published
- 2024
4. Clinical effectiveness and analytical quality of a national pointof-care testing network for sexually transmitted infections integrated into rural and remote primary care clinics in Australia, 2016 - 2022: an observational program evaluation
- Author
-
Causer, LM, Ward, J, Smith, K, Saha, A, Andrewartha, K, Wand, H, Hengel, B, Badman, SG, Tangey, A, Matthews, S, Mak, D, Gunathilake, M, Moore, E, Speers, D, Persing, D, Anderson, D, Whiley, D, Maher, L, Regan, D, Donovan, B, Fairley, C, Kaldor, J, Shephard, M, Guy, R, Causer, LM, Ward, J, Smith, K, Saha, A, Andrewartha, K, Wand, H, Hengel, B, Badman, SG, Tangey, A, Matthews, S, Mak, D, Gunathilake, M, Moore, E, Speers, D, Persing, D, Anderson, D, Whiley, D, Maher, L, Regan, D, Donovan, B, Fairley, C, Kaldor, J, Shephard, M, and Guy, R
- Abstract
BACKGROUND: To address inequitable diagnostic access and improve time-to-treatment for First Nations peoples, molecular point-of-care (POC) testing for chlamydia, gonorrhoea and trichomonas was integrated into 49 primary care clinics across Australia. We conducted an observational evaluation to determine clinical effectiveness and analytical quality of POC testing delivered through this national program. METHODS: We evaluated (i) implementation by measuring trends in mean monthly POC testing; ii) clinical effectiveness by comparing proportions of positive patients treated by historical control/intervention period and by test type, and calculated infectious days averted; (iii) analytical quality by calculating result concordance by test type, and proportion of unsuccessful POC tests. FINDINGS: Between 2016 and 2022, 46,153 POC tests were performed; an increasing mean monthly testing trend was observed in the first four years (p < 0.0001). A greater proportion of chlamydia/gonorrhoea positives were treated in intervention compared with historical control periods (≤2 days: 37% vs 22% [RR 1.68; 95% CI 1.12, 2.53]; ≤7 days: 48% vs 30% [RR 1.6; 95% CI 1.10, 2.33]; ≤120 days: 79% vs 54% [RR 1.46; 95% CI 1.10, 1.95]); similarly for trichomonas positives and by test type. POC testing for chlamydia, gonorrhoea and trichomonas averted 4930, 5620 and 7075 infectious days, respectively. Results concordance was high [99.0% (chlamydia), 99.3% (gonorrhoea) and 98.9% (trichomonas)]; unsuccessful POC test proportion was 1.8% for chlamydia/gonorrhoea and 2.1% for trichomonas. INTERPRETATION: Molecular POC testing was successfully integrated into primary care settings as part of a routinely implemented program achieving significant clinical benefits with high analytical quality. In addition to the individual health benefits of earlier treatment, fewer infective days could contribute to reduced transmissions in First Nations communities. FUNDING: This work was supported by an Australian
- Published
- 2024
5. Sex work and HIV in Cambodia: Trajectories of risk and disease in two cohorts of high-risk young women in Phnom Penh, Cambodia
- Author
-
Page, Kimberly, Stein, E, Sansothy, N, Evans, J, Couture, MC, Sichan, K, Cockroft, M, Mooney-Somers, J, Phlong, P, and Kaldor, J
- Abstract
Objectives: HIV prevalence among Cambodian female sex workers (FSW) is among the highest in Southeast Asia. We describe HIV prevalence and associated risk exposures in FSW sampled serially in Phnom Penh, Cambodia (Young Women's Health Study (YWHS)), before
- Published
- 2013
6. The 15-Country Collaborative Study of Cancer Risk among Radiation Workers in the Nuclear Industry: Estimates of Radiation-Related Cancer Risks
- Author
-
Cardis, E., Blettner, M., Gilbert, E., Hakama, M., Hill, C., Howe, G., Kaldor, J., Muirhead, C. R., Yoshimura, T., Cowper, G., Fix, J., Marshall, M., Engels, H., Engholm, G., Martuzzi, M., and Moser, M.
- Published
- 2007
7. The 15-Country Collaborative Study of Cancer Risk among Radiation Workers in the Nuclear Industry: Design, Epidemiological Methods and Descriptive Results
- Author
-
Cardis, E., Blettner, M., Gilbert, E., Hakama, M., Hill, C., Howe, G., Kaldor, J., Muirhead, C. R., Yoshimura, T., and Engels, H.
- Published
- 2007
8. Beyond patient delay, navigating structural health system barriers to timely care and treatment in a high burden TB setting in Papua New Guinea
- Author
-
Jops, P, Cowan, J, Kupul, M, Trumb, RN, Graham, SM, Bauri, M, Nindil, H, Bell, S, Keam, T, Majumdar, S, Pomat, W, Marais, B, Marks, GB, Kaldor, J, Vallely, A, Kelly-Hanku, A, Jops, P, Cowan, J, Kupul, M, Trumb, RN, Graham, SM, Bauri, M, Nindil, H, Bell, S, Keam, T, Majumdar, S, Pomat, W, Marais, B, Marks, GB, Kaldor, J, Vallely, A, and Kelly-Hanku, A
- Abstract
Tuberculosis (TB) is a major public health issue in Papua New Guinea, with incidence rates particularly high in the South Fly District of Western Province. We present three case studies, along with additional vignettes, that were derived from interviews and focus groups carried out between July 2019 and July 2020 of people living in rural areas of the remote South Fly District depicting their challenges accessing timely TB diagnosis and care; most services within the district are only offered offshore on Daru Island. The findings detail that rather than 'patient delay' attributed to poor health seeking behaviours and inadequate knowledge of TB symptoms, many people were actively trying to navigate structural barriers hindering access to and utilisation of limited local TB services. The findings highlight a fragile and fragmented health system, a lack of attention given to primary health services, and undue financial burdens placed on people living in rural and remote areas associated with costly transportation to access functioning health services. We conclude that a person-centred and effective decentralised model of TB care as outlined in health policies is imperative for equitable access to essential health care services in Papua New Guinea.
- Published
- 2023
9. Complex intervention to promote human papillomavirus (HPV) vaccine uptake in school settings: A cluster-randomized trial.
- Author
-
Davies, C, Marshall, HS, Brotherton, JML, McCaffery, K, Kang, M, Macartney, K, Garland, SM, Kaldor, J, Zimet, G, Skinner, SR, HPV.edu Study Group, Davies, C, Marshall, HS, Brotherton, JML, McCaffery, K, Kang, M, Macartney, K, Garland, SM, Kaldor, J, Zimet, G, Skinner, SR, and HPV.edu Study Group
- Abstract
Using a cluster-randomized trial design, we aimed to evaluate a complex intervention to increase uptake of human papillomavirus (HPV) vaccination in schools. The study was undertaken in high schools in Western Australia and South Australia between 2013 and 2015 with adolescents aged 12-13 years. Interventions included education, shared decision-making, and logistical strategies. The main outcome was school vaccine uptake. Secondary outcomes included consent forms returned and mean time to vaccinate 50 students. We hypothesised that a complex intervention would increase 3-dose HPV vaccine uptake. We recruited 40 schools (21 intervention, 19 control) with 6, 967 adolescents. There was no difference between intervention and control (3-dose mean 75.7% and 78.9%, respectively). Following adjustment for baseline covariates, absolute differences in coverage in favour of the intervention group were: dose 1, 0.8% (95% CI, -1.4,3.0); dose 2, 0.2% (95% CI, -2.7, 3.1); dose 3, 0.5% (95% CI, -2.6, 3.7). The percentage of returned consent forms in intervention schools (91.4%) was higher than in control schools (difference: 6%, 95% CI, 1.4, 10.7). There was a shorter mean time to vaccinate 50 students at dose 3. The difference for dose 3 was 110 min (95% CI, 42, 177); for dose 2, 90 min (95% CI, -15, 196); and dose 1, 28 min (95% CI, -71, 127). Logs revealed the inconsistent implementation of logistical strategies. The intervention had no impact on uptake. Inadequate resourcing for logistical strategies and advisory board reluctance toward strategies with potential financial implications impacted the implementation of logistical components. TRIAL REGISTRATION: Australian and New Zealand Clinical Trials Registry, ACTRN12614000404628, 14.04.2014. The study protocol was published in 2015 before data collection was finalised (Skinner et al., 2015). THE HPV.EDU STUDY GROUP: We would like to acknowledge the contributions to this study by members of the HPV.edu Study Group, including: Pr
- Published
- 2023
10. Risk factors for herpes zoster in a large cohort of unvaccinated older adults : a prospective cohort study
- Author
-
LIU, B., HEYWOOD, A. E., REEKIE, J., BANKS, E., KALDOR, J. M., McINTYRE, P., NEWALL, A. T., and MACINTYRE, C. R.
- Published
- 2015
11. Costs of mass drug administration for scabies in Fiji
- Author
-
Turner, HC, Mow, M, Thean, LJ, Parnaby, M, Mani, J, Rafai, E, Sahukhan, A, Kama, M, Tuicakau, M, Kado, J, Romani, L, Engelman, D, Whitfeld, M, Kaldor, J, Steer, A, Carvalho, N, Turner, HC, Mow, M, Thean, LJ, Parnaby, M, Mani, J, Rafai, E, Sahukhan, A, Kama, M, Tuicakau, M, Kado, J, Romani, L, Engelman, D, Whitfeld, M, Kaldor, J, Steer, A, and Carvalho, N
- Abstract
In 2019, the Murdoch Children's Research Institute in partnership with the Fiji Ministry of Health and Medical Services carried out an integrated mass drug administration (MDA) for the treatment of scabies and lymphatic filariasis in the Northern Division of Fiji (population estimate 131,914). We conducted a retrospective micro-costing exercise focused on the cost of scabies control in order to inform budgeting and policy decision making in an endemic setting. We collected detailed information on financial and economic costs incurred by both parties during the course of the MDA campaign (April 2018 to July 2019). We also conducted interviews with personnel involved in the financial administration of the MDA campaign. The economic cost of delivering two doses of ivermectin was US$4.88 per person. The cost of donated drugs accounted for 36.3% of total MDA costs. In this first large-scale MDA for the public health control of scabies, the estimated cost of delivering MDA per person for scabies was considerably more expensive than the costs reported for other neglected tropical diseases. The important cost drivers included the remuneration of health care workers who were extensively involved in the campaign, coverage of hard-to-reach, mainly rural populations and the two-dose regimen of ivermectin. These results highlight the importance of these cost determinants and can be used to plan current and future MDA programs.
- Published
- 2022
12. Preferences for HIV Testing Services and HIV Self-Testing Distribution Among Migrant Gay, Bisexual, and Other Men Who Have Sex With Men in Australia
- Author
-
Zhang, Y, Wiseman, V, Applegate, TL, Lourenco, RDA, Street, DJ, Smith, K, Jamil, MS, Terris-Prestholt, F, Fairley, CK, McNulty, A, Hynes, A, Johnson, K, Chow, EPF, Bavinton, BR, Grulich, A, Stoove, M, Holt, M, Kaldor, J, Guy, R, Ong, JJ, Zhang, Y, Wiseman, V, Applegate, TL, Lourenco, RDA, Street, DJ, Smith, K, Jamil, MS, Terris-Prestholt, F, Fairley, CK, McNulty, A, Hynes, A, Johnson, K, Chow, EPF, Bavinton, BR, Grulich, A, Stoove, M, Holt, M, Kaldor, J, Guy, R, and Ong, JJ
- Abstract
BACKGROUND: In Australia, undiagnosed HIV rates are much higher among migrant gay, bisexual, or other men who have sex with men (GBMSM) than Australian-born GBMSM. HIV self-testing is a promising tool to overcome barriers to HIV testing and improve HIV testing uptake among migrant GBMSM. We compared the preferences for HIV testing services, including HIV self-testing, among migrant and Australian-born GBMSM. METHODS: Preferences were assessed via two discrete choice experiments (DCEs). Participants were recruited between December 2017 and January 2018 using online and offline advertising and randomly assigned to complete one of two online DCE surveys. Migrant GBMSM were classified as being born in a country with a reciprocal healthcare agreement (RHCA) with Australia (providing free or subsided health care) or not. Latent class analysis and mixed logit models were used to explore heterogeneity in preferences. FINDINGS: We recruited 1,606 GBMSM, including 583 migrant men of whom 419 (72%) were born in non-RHCA countries. Most participants preferred a free or cheap oral test with higher accuracy and a shorter window period to facilitate early detection of infections. Cost was more important for men born in non-RHCA countries than for men from RHCA countries or Australia. All groups preferred accessing kits through online distributers or off the shelf purchasing from pharmacies. Men born in RHCA countries least preferred accessing HIV self-testing kits from a medical clinic, while more than half of men from non-RHCA countries most preferred sourcing kits from a clinic. Sex-on-premises venues were the least preferred location to access test kits among all groups. In addition, two latent class analyses explored heterogeneity in preferences among men from non-RHCA countries and we found four latent classes for HIV testing services and two latent classes for HIVST distribution. INTERPRETATION: Our findings emphasise the need for high-performing and low-cost HIV self-testin
- Published
- 2022
13. Prevention of bacterial complications of scabies using mass drug administration: A population-based, before-after trial in Fiji, 2018-2020
- Author
-
Thean, LJ, Romani, L, Engelman, D, Wand, H, Jenney, A, Mani, J, Paka, J, Cua, T, Taole, S, Silai, M, Ashwini, K, Sahukhan, A, Kama, M, Tuicakau, M, Kado, J, Parnaby, M, Carvalho, N, Whitfeld, M, Kaldor, J, Steer, AC, Thean, LJ, Romani, L, Engelman, D, Wand, H, Jenney, A, Mani, J, Paka, J, Cua, T, Taole, S, Silai, M, Ashwini, K, Sahukhan, A, Kama, M, Tuicakau, M, Kado, J, Parnaby, M, Carvalho, N, Whitfeld, M, Kaldor, J, and Steer, AC
- Abstract
BACKGROUND: Scabies is an important predisposing factor of impetigo which can lead to serious bacterial complications. Ivermectin-based mass drug administration can substantially reduce scabies and impetigo prevalence in endemic settings, but the impact on serious bacterial complications is not known. METHODS: We conducted a before-after trial in the Northern Division of Fiji (population: 131,914) of mass drug administration for scabies control. Prospective surveillance was conducted from 2018 to 2020. Mass drug administration took place in 2019, involving two doses of oral ivermectin or topical permethrin, delivered alongside diethylcarbamazine and albendazole for lymphatic filariasis. The primary outcomes were incidence of hospitalisations with skin and soft tissue infections, and childhood invasive infections and post-streptococcal sequelae. Secondary outcomes included presentations to primary healthcare with skin infections and community prevalence of scabies and impetigo. FINDINGS: The incidence of hospitalisations with skin and soft tissue infections was 17% lower after the intervention compared to baseline (388 vs 467 per 100,000 person-years; incidence rate ratio 0.83, 95% CI, 0.74 to 0.94; P = 0.002). There was no difference in incidence of childhood invasive infections and post-streptococcal sequelae. Incidence of primary healthcare presentations with scabies and skin infections was 21% lower (89.2 vs 108 per 1000 person-years, incidence rate ratio, IRR 0.79, 95% CI, 0.78 to 0.82). Crude community prevalence of scabies declined from 14.2% to 7.7% (cluster-adjusted prevalence 12.5% to 8.9%; prevalence ratio 0.71, 95% CI, 0.28 to 1.17). Cluster-adjusted prevalence of impetigo declined from 15.3% to 6.1% (prevalence ratio 0.4, 95% CI, 0.18 to 0.86). INTERPRETATION: Mass drug administration for scabies control was associated with a substantial reduction in hospitalisations for skin and soft tissue infections. FUNDING: National Health and Medical Research Counc
- Published
- 2022
14. Using quantitative PCR to identify opportunities to strengthen soil-transmitted helminth control in Solomon Islands: A cross-sectional epidemiological survey
- Author
-
Mitreva, M, Le, B, Clarke, N, Hii, SF, Byrne, A, Zendejas-Heredia, PAA, Lake, S, Sokana, O, Khattak, A, Romani, L, Engelman, D, Nasi, T, Boara, D, Kaldor, J, Steer, A, Traub, R, Nery, SV, Mitreva, M, Le, B, Clarke, N, Hii, SF, Byrne, A, Zendejas-Heredia, PAA, Lake, S, Sokana, O, Khattak, A, Romani, L, Engelman, D, Nasi, T, Boara, D, Kaldor, J, Steer, A, Traub, R, and Nery, SV
- Abstract
BACKGROUND: The Kato-Katz microscopy technique is the global standard for assessment of soil-transmitted helminth (STH) burden. However, major limitations include its poor sensitivity, requirement for rapid sample processing, and inability to differentiate hookworm species nor detect Strongyloides spp. infections. We assessed the prevalence and intensity of STH species in Solomon Islands by conducting a province-wide survey using quantitative PCR (qPCR) for diagnosis, which can provide much better characterisation of STH burden than microscopy. METHODOLOGY/PRINCIPAL FINDINGS: We conducted a cross-sectional survey in 18 villages in Western Province to detect infections with six STH species and quantify intensity with three. We used linear mixed model regression to identify potential water, sanitation, and hygiene (WASH) and environmental risk factors for infection. We collected stool specimens from 830 village residents. Overall STH prevalence was 63.3% (range 27.5 to 91.5% across villages), led by Necator americanus (54.5% [range 17.5-89.4%]), followed by Ancylostoma ceylanicum (15.5% [range 2.8-45.8%]), Trichuris trichiura (9.1% [range 0-79.2%]), and Strongyloides spp. (3.2% [range 0-29.2%]). Most infections were of light intensity for N. americanus (85.7%) and T. trichiura (90.7%). Owning a household latrine was associated with a lower risk of N. americanus infection (AOR 0.41, 95% CI 0.24-0.68) while greater precipitation was linked to more common T. trichiura infection (AOR 1.14, 95% CI 1.04-1.25). CONCLUSION/SIGNIFICANCE: In this first large-scale population survey of STH in the Pacific using qPCR, we found evidence that ivermectin should be incorporated into STH control programmes because of the presence of T. trichiura and Strongyloides spp., both of which are poorly responsive to albendazole. Furthermore, One Health strategies are needed for improved A. ceylanicum and Strongyloides spp. control, WASH access and use should be improved to complement deworming
- Published
- 2022
15. Community perceptions and acceptability of mass drug administration for the control of neglected tropical diseases in Asia-Pacific countries: A systematic scoping review of qualitative research
- Author
-
Horstick, O, Mitchell, E, Kelly-Hanku, A, Krentel, A, Romani, L, Robinson, LJ, Vaz Nery, S, Kaldor, J, Steer, AC, Bell, S, Horstick, O, Mitchell, E, Kelly-Hanku, A, Krentel, A, Romani, L, Robinson, LJ, Vaz Nery, S, Kaldor, J, Steer, AC, and Bell, S
- Abstract
BACKGROUND: Preventative chemotherapy and mass drug administration have been identified as effective strategies for the prevention, treatment, control and elimination of several NTDs in the Asia-Pacific region. Qualitative research can provide in-depth insight into the social dynamics and processes underlying effective implementation of and adherence to mass drug administration programs. This scoping review examines published qualitative literature to examine factors influencing community perceptions and acceptability of mass drug administration approaches to control NTDs in the Asia-Pacific region. METHODOLOGY: Twenty-four peer reviewed published papers reporting qualitative data from community members and stakeholders engaged in the implementation of mass drug administration programs were identified as eligible for inclusion. FINDINGS: This systematic scoping review presents available data from studies focussing on lymphatic filariasis, soil-transmitted helminths and scabies in eight national settings (India, Indonesia, Philippines, Bangladesh, Laos, American Samoa, Papua New Guinea, Fiji). The review highlights the profoundly social nature of individual, interpersonal and institutional influences on community perceptions of willingness to participate in mass drug administration programs for control of neglected tropical diseases (NTD). Future NTD research and control efforts would benefit from a stronger qualitative social science lens to mass drug administration implementation, a commitment to understanding and addressing the social and structural determinants of NTDs and NTD control in complex settings, and efforts to engage local communities as equal partners and experts in the co-design of mass drug administration and other efforts to prevent, treat, control and eliminate NTDs. CONCLUSION: For many countries in the Asia-Pacific region, the "low hanging fruit has been picked" in terms of where mass drug administration has worked and transmission has been stopp
- Published
- 2022
16. Measuring school level attributable risk to support school-based HPV vaccination programs
- Author
-
Vujovich-Dunn, C, Wand, H, Brotherton, JML, Gidding, H, Sisnowski, J, Lorch, R, Veitch, M, Sheppeard, V, Effler, P, Skinner, SR, Venn, A, Davies, C, Hocking, J, Whop, L, Leask, J, Canfell, K, Sanci, L, Smith, M, Kang, M, Temple-Smith, M, Kidd, M, Burns, S, Selvey, L, Meijer, D, Ennis, S, Thomson, C, Lane, N, Kaldor, J, Guy, R, Vujovich-Dunn, C, Wand, H, Brotherton, JML, Gidding, H, Sisnowski, J, Lorch, R, Veitch, M, Sheppeard, V, Effler, P, Skinner, SR, Venn, A, Davies, C, Hocking, J, Whop, L, Leask, J, Canfell, K, Sanci, L, Smith, M, Kang, M, Temple-Smith, M, Kidd, M, Burns, S, Selvey, L, Meijer, D, Ennis, S, Thomson, C, Lane, N, Kaldor, J, and Guy, R
- Abstract
BACKGROUND: In Australia in 2017, 89% of 15-year-old females and 86% of 15-year-old males had received at least one dose of the HPV vaccine. However, considerable variation in HPV vaccination initiation (dose one) across schools remains. It is important to understand the school-level characteristics most strongly associated with low initiation and their contribution to the overall between-school variation. METHODS: A population-based ecological analysis was conducted using school-level data for 2016 on all adolescent students eligible for HPV vaccination in three Australian jurisdictions. We conducted logistic regression to determine school-level factors associated with lower HPV vaccination initiation (< 75% dose 1 uptake) and estimated the population attributable risk (PAR) and the proportion of schools with the factor (school-level prevalence). RESULTS: The factors most strongly associated with lower initiation, and their prevalence were; small schools (OR = 9.3, 95%CI = 6.1-14.1; 33% of schools), special education schools (OR = 5.6,95%CI = 3.7-8.5; 8% of schools), higher Indigenous enrolments (OR = 2.7,95% CI:1.9-3.7; 31% of schools), lower attendance rates (OR = 2.6,95%CI = 1.7-3.7; 35% of schools), remote location (OR = 2.6,95%CI = 1.6-4.3; 6% of schools,) and lower socioeconomic area (OR = 1.8,95% CI = 1.3-2.5; 33% of schools). The highest PARs were small schools (PAR = 79%, 95%CI:76-82), higher Indigenous enrolments (PAR = 38%, 95%CI: 31-44) and lower attendance rate (PAR = 37%, 95%CI: 29-46). CONCLUSION: This analysis suggests that initiatives to support schools that are smaller, with a higher proportion of Indigenous adolescents and lower attendance rates may contribute most to reducing the variation of HPV vaccination uptake observed at a school-level in these jurisdictions. Estimating population-level coverage at the school-level is useful to guide policy and prioritise resourcing to support school-based vaccination programs.
- Published
- 2022
17. An Observational Study to Assess the Effectiveness of 4CMenB against Meningococcal Disease and Carriage and Gonorrhea in Adolescents in the Northern Territory, Australia-Study Protocol.
- Author
-
Marshall, HS, Andraweera, PH, Ward, J, Kaldor, J, Andrews, R, Macartney, K, Richmond, P, Krause, V, Koehler, A, Whiley, D, Giles, L, Webby, R, D'Antoine, H, Karnon, J, Baird, R, Lawrence, A, Petousis-Harris, H, De Wals, P, Greenwood-Smith, B, Binks, M, Whop, L, Marshall, HS, Andraweera, PH, Ward, J, Kaldor, J, Andrews, R, Macartney, K, Richmond, P, Krause, V, Koehler, A, Whiley, D, Giles, L, Webby, R, D'Antoine, H, Karnon, J, Baird, R, Lawrence, A, Petousis-Harris, H, De Wals, P, Greenwood-Smith, B, Binks, M, and Whop, L
- Abstract
Invasive meningococcal disease (IMD) causes significant morbidity and mortality worldwide with serogroup B being the predominant serogroup in Australia and other countries for the past few decades. The licensed 4CMenB vaccine is effective in preventing meningococcal B disease. Emerging evidence suggests that although 4CMenB impact on carriage is limited, it may be effective against gonorrhoea due to genetic similarities between Neisseria meningitidis and Neisseria gonorrhoeae. This study protocol describes an observational study that will assess the effect of the 4CMenB vaccine against meningococcal carriage, IMD and gonorrhoea among adolescents in the Northern Territory (NT). All 14-19-year-olds residing in the NT with no contraindication for 4CMenB vaccine will be eligible to participate in this cohort study. Following consent, two doses of 4CMenB vaccine will be administered two months apart. An oropharyngeal swab will be collected at baseline and 12 months to detect pharyngeal carriage of Neisseria meningitidis by PCR. The main methodological approaches to assess the effect of 4CMenB involve a nested case control analysis and screening method to assess vaccine effectiveness and an Interrupted Time Series regression analysis to assess vaccine impact. Research ethics approvals have been obtained from Menzies and Central Australian Human Research Ethics Committees and the Western Australian Aboriginal Health Ethics Committee. Results will be provided in culturally appropriate formats for NT remote and regional communities and published in international peer reviewed journals. ClinicalTrials.gov Identifier: NCT04398849.
- Published
- 2022
18. The impact of removing financial incentives and/or audit and feedback on chlamydia testing in general practice: A cluster randomised controlled trial (ACCEPt-able)
- Author
-
Peiris, D, Hocking, JS, Wood, A, Temple-Smith, M, Braat, S, Law, M, Bulfone, L, Jones, C, Van Driel, M, Fairley, CK, Donovan, B, Guy, R, Low, N, Kaldor, J, Gunn, J, Peiris, D, Hocking, JS, Wood, A, Temple-Smith, M, Braat, S, Law, M, Bulfone, L, Jones, C, Van Driel, M, Fairley, CK, Donovan, B, Guy, R, Low, N, Kaldor, J, and Gunn, J
- Abstract
BACKGROUND: Financial incentives and audit/feedback are widely used in primary care to influence clinician behaviour and increase quality of care. While observational data suggest a decline in quality when these interventions are stopped, their removal has not been evaluated in a randomised controlled trial (RCT), to our knowledge. This trial aimed to determine whether chlamydia testing in general practice is sustained when financial incentives and/or audit/feedback are removed. METHODS AND FINDINGS: We undertook a 2 × 2 factorial cluster RCT in 60 general practices in 4 Australian states targeting 49,525 patients aged 16-29 years for annual chlamydia testing. Clinics were recruited between July 2014 and September 2015 and were followed for up to 2 years or until 31 December 2016. Clinics were eligible if they were in the intervention group of a previous cluster RCT where general practitioners (GPs) received financial incentives (AU$5-AU$8) for each chlamydia test and quarterly audit/feedback reports of their chlamydia testing rates. Clinics were randomised into 1 of 4 groups: incentives removed but audit/feedback retained (group A), audit/feedback removed but incentives retained (group B), both removed (group C), or both retained (group D). The primary outcome was the annual chlamydia testing rate among 16- to 29-year-old patients, where the numerator was the number who had at least 1 chlamydia test within 12 months and the denominator was the number who had at least 1 consultation during the same 12 months. We undertook a factorial analysis in which we investigated the effects of removal versus retention of incentives (groups A + C versus groups B + D) and the effects of removal versus retention of audit/feedback (group B + C versus groups A + D) separately. Of 60 clinics, 59 were randomised and 55 (91.7%) provided data (group A: 15 clinics, 11,196 patients; group B: 14, 11,944; group C: 13, 11,566; group D: 13, 14,819). Annual testing decreased from 20.2% to 11.7
- Published
- 2022
19. Exploring Tuberculosis Riskscapes in a Papua New Guinean 'Hotspot'
- Author
-
Jops, P, Kupul, M, Trumb, RN, Cowan, J, Graham, SM, Bell, S, Majumdar, S, Nindil, H, Pomat, W, Marais, B, Marks, G, Vallely, AJ, Kaldor, J, Kelly-Hanku, A, Jops, P, Kupul, M, Trumb, RN, Cowan, J, Graham, SM, Bell, S, Majumdar, S, Nindil, H, Pomat, W, Marais, B, Marks, G, Vallely, AJ, Kaldor, J, and Kelly-Hanku, A
- Abstract
This article explores socio-spatial dimensions of risk and how they can enhance understanding of a high burden tuberculosis (TB) context in the South Fly District of Papua New Guinea. We report on select findings from a qualitative study that included 128 semi-structured in-depth interviews and 10 focus group discussions with a wide range of South Fly District community members. Using the conceptual framework of 'riskscapes' to examine emic perspectives on risk, space and practice, we map key elements of TB riskscapes on Daru Island, South Fly District, along with solutions for navigating through these riskscapes. Overcrowding, lack of water, sanitation and hygiene, as well as food insecurity and undernutrition, were identified as common elements within participants' riskscapes, that compounded upon each other to create the perception of an assemblage of risk favourable to TB transmission.
- Published
- 2022
20. The Importance of Partnership in the Rollout of Triple-Drug Therapy to Eliminate Lymphatic Filariasis in the Pacific
- Author
-
Rainima-Qaniuci, M, Lepaitai, HB, Bhagirov, R, Padmasiri, E, Naseri, T, Thomsen, R, Won, KY, Brant, TA, Dodd, E, Nua, MT, Utu, F, Tufa, A, Chutaro, E, Camacho, J, Suiaunoa-Scanlan, L, Thean, LJ, Mani, J, Hardy, M, Samuela, J, Romani, L, Kaldor, J, Steer, AC, Faktaufon, D, Bechu, V, Naqio, F, Sosene, V, Sekihara, M, Otaki, J, Buhagiar, TS, Yajima, A, Rainima-Qaniuci, M, Lepaitai, HB, Bhagirov, R, Padmasiri, E, Naseri, T, Thomsen, R, Won, KY, Brant, TA, Dodd, E, Nua, MT, Utu, F, Tufa, A, Chutaro, E, Camacho, J, Suiaunoa-Scanlan, L, Thean, LJ, Mani, J, Hardy, M, Samuela, J, Romani, L, Kaldor, J, Steer, AC, Faktaufon, D, Bechu, V, Naqio, F, Sosene, V, Sekihara, M, Otaki, J, Buhagiar, TS, and Yajima, A
- Abstract
We discuss the experience of some Pacific island countries in introducing the new WHO-recommended treatment protocol for lymphatic filariasis-a triple-drug therapy composed of ivermectin, diethylcarbamazine, and albendazole. The successful rollout of the new treatment protocol was dependent on strong partnerships among these countries' ministries of health, WHO, and other stakeholders. Effective communication among these partners allowed for lessons learned to cross borders and have a positive impact on the experiences of other countries. We also describe various challenges confronted during this process and the ways these countries overcame them.
- Published
- 2022
21. A national survey integrating clinical, laboratory, and WASH data to determine the typology of trachoma in Nauru
- Author
-
Nash, SD, Lynch, K, Apadinuwe, SCM, Lambert, S, Hillgrove, T, Starr, M, Catlett, B, Ware, R, Cama, AW, Webster, S, Harding-Esch, EM, Bakhtiari, A, Butcher, R, Cunningham, P, Martin, D, Gwyn, S, Solomon, A, Garabwan, C, Kaldor, J, Vaz Nery, S, Nash, SD, Lynch, K, Apadinuwe, SCM, Lambert, S, Hillgrove, T, Starr, M, Catlett, B, Ware, R, Cama, AW, Webster, S, Harding-Esch, EM, Bakhtiari, A, Butcher, R, Cunningham, P, Martin, D, Gwyn, S, Solomon, A, Garabwan, C, Kaldor, J, and Vaz Nery, S
- Abstract
BACKGROUND: The epidemiology of trachoma in several Pacific Islands differs from other endemic settings, in that there is a high prevalence of clinical signs of trachoma, particularly trachomatous inflammation-follicular (TF), but few cases of trichiasis and limited evidence of ocular chlamydial infection. This so-called "Pacific enigma" has led to uncertainty regarding the appropriate public health response. In 2019 alongside Nauru's national trachoma population survey, we performed bacteriological and serological assessments of children to better understand the typology of trachoma and to determine whether there is a need for trachoma interventions. METHODS: We used two-stage cluster sampling, examining residents aged ≥1 year and collecting household-level water, sanitation, and hygiene (WASH) variables. Children aged 1-9 years provided conjunctival swabs and finger-prick dried blood spots to investigate the presence of Chlamydia trachomatis nucleic acid and anti-Pgp3 antibodies, respectively. PRINCIPAL FINDINGS: In 818 participants aged 1-9 years, the age-adjusted TF prevalence was 21.8% (95% CI 15.2-26.2%); ocular C. trachomatis prevalence was 34.5% (95% CI 30.6-38.9), and anti-Pgp3 antibody prevalence was 32.1% (95% CI 28.4%-36.3%). The age- and gender-adjusted prevalence of trichiasis in ≥15-year-olds was 0.3% (95% CI 0.00-0.85), but no individual with trichiasis had trachomatous scarring (TS). Multivariable analysis showed an association between age and both TF (OR per year of age 1.3 [95% CI 1.2-1.4]) and anti-Pgp3 positivity (OR 1.2 [95% CI 1.2-1.3]). There were high rates of access to water and sanitation and no WASH variable was associated with the presence of TF. CONCLUSIONS: TF, nucleic acid, and age-specific antibody prevalence collectively indicate that high levels of C. trachomatis transmission among children present a high risk of ocular damage due to trachoma. The absence of trichiasis with trachomatous scarring suggest a relatively recent increase
- Published
- 2022
22. Health workers, health facilities and penile cutting in Papua New Guinea: Implications for male circumcision as an HIV prevention strategy
- Author
-
Tynan, A, Vallely, A, Kelly, A, Kupul, M, Law, G, Millan, J, Siba, P, Kaldor, J, and Hill, PS
- Published
- 2011
23. Predictors of HIV Testing and Serostatus amongst Children Admitted to Port Moresby General Hospital
- Author
-
Allison, WE, Kiromat, M, Vince, JD, Schaefer, M, and Kaldor, J
- Published
- 2009
24. Patterns and Characteristics of Hepatitis C Transmission Clusters among HIV-Positive and HIV-Negative Individuals in the Australian Trial in Acute Hepatitis C
- Author
-
the ATAHC Study Group, Matthews, G. V., Pham, S. T., Hellard, M., Grebely, J., Zhang, L., Oon, A., Marks, P., van Beek, I., Rawlinson, W., Kaldor, J. M., Lloyd, A., Dore, G. J., and White, P. A.
- Published
- 2011
- Full Text
- View/download PDF
25. Enhanced case detection for newly acquired hepatitis C infection: epidemiological findings and health service implications
- Author
-
White, B, Gibson, K, Spelman, T, Lim, M, Lewis, J, Higgins, N, Pedrana, A, Devadason, D, Guy, R, Hellard, M, and Kaldor, J
- Published
- 2008
26. Characteristics and Treatment Outcomes among HIV-Infected Individuals in the Australian Trial in Acute Hepatitis C
- Author
-
Matthews, G. V., Hellard, M., Haber, P., Yeung, B., Marks, P., Baker, D., McCaughan, G., Sasadeusz, J., White, P., Rawlinson, W., Lloyd, A., Kaldor, J., and Dore, G. J.
- Published
- 2009
- Full Text
- View/download PDF
27. Occupational Exposure to Power Frequency Magnetic Fields and Risk of Non-Hodgkin Lymphoma
- Author
-
Karipidis, K., Benke, G., Sim, M., Fritschi, L., Yost, M., Armstrong, B., Hughes, A. M., Grulich, A., Vajdic, C. M., Kaldor, J. M., and Kricker, A.
- Published
- 2007
- Full Text
- View/download PDF
28. Effect of a School-Based Educational Intervention About the Human Papillomavirus Vaccine on Psychosocial Outcomes Among Adolescents: Analysis of Secondary Outcomes of a Cluster Randomized Trial
- Author
-
Davies, C, Marshall, HS, Zimet, G, McCaffery, K, Brotherton, JML, Kang, M, Garland, S, Kaldor, J, McGeechan, K, Skinner, SR, and HPV.edu Study Group
- Abstract
ImportanceDelivery of vaccination to adolescents via a school-based program provides an opportunity to promote their involvement in health decision-making, service provision, and self-efficacy (belief in one's ability to perform a certain behavior).ObjectiveTo examine the effect of a human papillomavirus (HPV) vaccination education and logistical intervention on adolescent psychosocial outcomes.Design, setting, and participantsIn this cluster randomized trial and process and qualitative evaluation, adolescents aged 12 to 13 years (first year of high school) were recruited at high schools in Western Australia (WA) and South Australia (SA) in 2013 and 2014. Statistical analysis was performed from January 2016 to December 2020.InterventionsThe complex intervention consisted of an adolescent intervention to promote knowledge and psychosocial outcomes, shared decisional support tool, and logistical strategies.Main outcomes and measuresPrespecified secondary outcomes were assessed. The HPV Adolescent Vaccination Intervention Questionnaire (HAVIQ) was used to measure changes in adolescent knowledge (6-item subscale), fear and anxiety (6-item subscale), self-efficacy (5-item subscale), and decision-making (8-item subscale). The hypothesis was that the intervention would improve adolescent involvement in vaccine decision-making (measured before dose 1 only), improve vaccine-related self-efficacy, and reduce vaccine-related fear and anxiety (measured before doses 1, 2, and 3). Mean (SD) scores for each subscale were compared between intervention and control students. In the process evaluation, focus groups were conducted. Analyses of the HAVIQ data were conducted from 2016 to 2020. Qualitative analyses of the focus groups were undertaken from 2017 to 2020.ResultsThe trial included 40 schools (21 intervention and 19 control) across sectors with 6967 adolescents (mean [SD] age, 13.70 [0.45] years). There were 3805 students (1689 girls and 2116 boys) in the intervention group and 3162 students (1471 girls and 1691 boys) in the control group. The overall response rate for the HAVIQ was 55%. In WA, where parental consent was required, the response rate was 35% (1676 of 4751 students); in SA, where parental consent was not required, it was 97% (2166 of 2216 students). The mean (SD) score for decision-making in the intervention group before dose 1 was 3.50 (0.42) of 5 points and 3.40 (0.40) in the control group, a small but significant difference of 0.11 point (95% CI, 0.06 to 0.16 point; P < .001). There was a small difference in favor of the intervention group in reduced vaccination-related anxiety (pre-dose 1 difference, -0.11 point [95% CI, -0.19 to -0.02 point]; pre-dose 2 difference, -0.18 point [95% CI, -0.26 to -0.10 point]; pre-dose 3 difference, -0.18 [95% CI, -0.24 to -0.11]) and increased vaccination self-efficacy (pre-dose 1 difference, 4.0 points; [95% CI, 1.0 to 7.0 points]; pre-dose 2 difference, 4.0 points [95% CI, 2.0 to 6.0 points]; pre-dose 3 difference, 3.0 points [95% CI, 1.0 to 5.0 points]). Focus group data from 111 adolescents in 6 intervention and 5 control schools revealed more confidence and less anxiety with each vaccine dose.Conclusions and relevanceIn this cluster randomized trial, there was a small difference in adolescent decisional involvement and vaccine-related confidence and reduced vaccination-related fear and anxiety that was maintained throughout the vaccine course in the intervention vs control groups. Guidelines for vaccination at school should incorporate advice regarding how this outcome can be achieved.Trial registrationAustralian and New Zealand Clinical Trials Registry: ACTRN12614000404628.
- Published
- 2021
29. Hepatitis C prevalence - a nationwide serosurvey
- Author
-
Gilbert, G, Backhouse, J, Burgess, M, Amin, J, Dore, G, Gidding, H, and Kaldor, J
- Published
- 2004
30. Risk Of Cancer After Low Doses Of Ionising Radiation: Retrospective Cohort Study In 15 Countries
- Author
-
The International Study Group, Cardis, E., Vrijheid, M., Blettner, M., Gilbert, E., Hakama, M., Hill, C., Howe, G., Kaldor, J., Muirhead, C. R., Schubauer-Berigan, M., and Yoshimura, T.
- Published
- 2005
- Full Text
- View/download PDF
31. Australia's notifiable diseases status, 2001: annual report of the National Notifiable Diseases Surveillance System
- Author
-
Kirk, M, Kaldor, J, Lin, M, Roche, P, Gidding, H, Wright, P, Hall, R, Milton, A, Spencer, J, Blumer, C, Bunn, C, Della-Porta, T, and Leader, R
- Published
- 2003
32. Australia's notifiable diseases status, 2000. Annual report of the National Notifiable Diseases Surveillance System
- Author
-
Spencer, J, Witteveen, D, Della-Porta, T, Wright, P, Bunn, C, Milton, A, Hall, R, Leader, R, Merianos, A, Kirk, M, Kaldor, J, Lin, M, Roche, P, and Gidding, H
- Published
- 2002
33. Outcomes from the first two years of the Australian hepatitis C surveillance strategy
- Author
-
Communicable Diseases Network Australia Viral Hepatitis Surveillance Committee, Correll, P, Spencer, J, Robotin, M, Kaldor, J, and Dore, G
- Published
- 2002
34. Childhood sexual abuse among Australian prisoners
- Author
-
Fleming, J, Levy, M, Kaldor, J, Donovan, B, and Butler, T
- Published
- 2001
35. 773Triple elimination of mother-to-child transmission of HIV, syphilis and hepatitis B in the Pacific Islands
- Author
-
Van Gemert, C, Hellard, M, Howell, J, O'Connor, M, Cowie, B, Allard, N, Homer, C, Brink, A, Chan, P-L, Kaldor, J, and Hockin, J
- Subjects
Epidemiology ,0104 Statistics, 1117 Public Health and Health Services - Abstract
Background Without intervention, HIV, hepatitis B virus and syphilis can be transmitted from mother-to-child during pregnancy, birth and breastfeeding and these can cause adverse pregnancy and longer-term outcomes. The 22 Pacific Island countries and territories (PICTs) have among the highest global prevalence of syphilis and hepatitis B. Mother-to-child transmission remains a concern, particularly hepatitis B. Global and regional elimination targets have been set to eliminate mother-to-child transmission (EMTCT) however progress of PICTs towards meeting targets is unknown. Methods Data from 2000-2019 relating to EMTCT epidemiological, process and impact targets were extracted from peer reviewed literature, online data repositories and grey literature. Results 27 peer reviewed reports, data from online data repositories for 19 countries and twelve national demographic and/or health reports were collated. Existing online databases report data for only small number of EMTCT indicators and there are few peer-reviewed studies that report EMTCT coverage estimates for PICTs. Availability of data varied between countries and available data suggests that few countries are meeting EMTCT indicator targets. Conclusions Based on the current trach trajectory, PICTs will not reach triple elimination by 2030. Both interventions to improve EMTCT activity coverage and strengthened surveillance, monitoring and evaluation systems are required. Key messages Mother-to-child transmission of HIV, hepatitis B and syphilis is a major concern in the Pacific and increased efforts are required, including strengthened monitoring and evaluation systems.
- Published
- 2021
36. Carcinogenic Drugs: A Model Data-Base for Human Risk Quantification
- Author
-
Kaldor, J. and Moolgavkar, Suresh H., editor
- Published
- 1990
- Full Text
- View/download PDF
37. Australasian Epidemiological Association postgraduate training survey
- Author
-
Spencer, J, Cunningham, J, and Kaldor, J
- Published
- 2000
38. Differences in school factors associated with adolescent HPV vaccination initiation and completion coverage in three Australian states
- Author
-
Sisnowski, J., primary, Vujovich-Dunn, C., additional, Gidding, H., additional, Brotherton, J., additional, Wand, H., additional, Lorch, R., additional, Veitch, M., additional, Sheppeard, V., additional, Effler, P., additional, Skinner, S.R, additional, Venn, A., additional, Davies, C., additional, Hocking, J., additional, Whop, L., additional, Leask, J., additional, Canfell, K., additional, Sanci, L., additional, Smith, M., additional, Kang, M., additional, Temple-Smith, M., additional, Kidd, M., additional, Burns, S., additional, Selvey, L., additional, Meijer, D., additional, Ennis, S., additional, Thomson, C., additional, Lane, N., additional, Kaldor, J., additional, and Guy, R., additional
- Published
- 2021
- Full Text
- View/download PDF
39. Effects of Low Doses and Low Dose Rates of External Ionizing Radiation: Cancer Mortality among Nuclear Industry Workers in Three Countries
- Author
-
Cardis, E., Gilbert, E. S., Carpenter, L., Howe, G., Kato, I., Armstrong, B. K., Beral, V., Cowper, G., Douglas, A., Fix, J., Fry, S. A., Kaldor, J., Lavé, C., Salmon, L., Smith, P. G., Voelz, G. L., and Wiggs, L. D.
- Published
- 1995
- Full Text
- View/download PDF
40. A field trial of azithromycin in the treatment of donovanosis in central Australia: a step towards eradication?
- Author
-
Tait, P, Skov, S, Kaldor, J, and Bowden, F
- Published
- 1998
41. O11.2 Treatment efficacy of 1g azithromycin versus 100mg doxycycline bi-daily for seven days for asymptomatic rectal Chlamydia trachomatis
- Author
-
Lau, A, primary, Kong, F, additional, Fairley, C, additional, Templeton, D, additional, Amin, J, additional, Phillips, S, additional, Law, M, additional, Chen, M, additional, Bradshaw, C, additional, Donovan, B, additional, McNulty, A, additional, Boyd, M, additional, Timms, P, additional, Chow, E, additional, Regan, D, additional, Khaw, C, additional, Lewis, D, additional, Kaldor, J, additional, Ratnayake, M, additional, Carvalho, N, additional, and Hocking, J, additional
- Published
- 2021
- Full Text
- View/download PDF
42. Congenital syphilis in a rural Australian population
- Author
-
Backhouse, J, Kaldor, J, McNulty, A, and Rowbottom, J
- Published
- 1996
43. Subtype‐specific differences in transmission cluster dynamics of HIV‐1 B and CRF01_AE in New South Wales, Australia
- Author
-
Di Giallonardo, F., Pinto, A.N., Keen, P., Shaik, A., Carrera, A., Salem, H., Selvey, C., Nigro, S.J., Fraser, N., Price, K., Holden, J., Lee, F.J., Dwyer, D.E., Bavinton, B.R., Geoghegan, J.L., Grulich, A.E., Kelleher, A.D., Grulich, A., Guy, R., Prestage, G., Zablotska, I., Duck, T., Cooper, C., Holt, M., de Wit, J., Kaldor, J., Kelleher, A., Wilson, D., Brotherton, A., Cooper, D.A., Crooks, L., Whittaker, B., Callander, D., Madeddu, D., Schmidt, H.-M., Telfer, B., Boyd, M., McGill, S., Patel, P., Power, C., Pinto, A., Nigro, S., Gordon, T., Feeney, L., Bath, K., Mackie, B., and the NSW HIV Prevention Partnership Project
- Subjects
Male ,Human immunodeficiency virus (HIV) ,HIV Infections ,medicine.disease_cause ,law.invention ,Men who have sex with men ,Sexual and Gender Minorities ,transmission cluster ,0302 clinical medicine ,Data sequences ,Risk Factors ,immune system diseases ,law ,Cluster Analysis ,Longitudinal Studies ,030212 general & internal medicine ,Clade ,Phylogeny ,Research Articles ,Recombination, Genetic ,Genetics ,Phylogenetic tree ,public health ,virus diseases ,3. Good health ,Infectious Diseases ,Transmission (mechanics) ,Female ,New South Wales ,0305 other medical science ,Research Article ,early infections ,03 medical and health sciences ,Phylogenetics ,HIV1 ,medicine ,Humans ,Homosexuality, Male ,Risk factor ,Heterosexuality ,demographic differences ,030505 public health ,business.industry ,Australia ,Public Health, Environmental and Occupational Health ,COVID-19 ,Coronavirus ,HIV-1 ,subtype B and CRF01_AE ,business - Abstract
Introduction The human immunodeficiency virus 1 (HIV‐1) pandemic is characterized by numerous distinct sub‐epidemics (clusters) that continually fuel local transmission. The aims of this study were to identify active growing clusters, to understand which factors most influence the transmission dynamics, how these vary between different subtypes and how this information might contribute to effective public health responses. Methods We used HIV‐1 genomic sequence data linked to demographic factors that accounted for approximately 70% of all new HIV‐1 notifications in New South Wales (NSW). We assessed differences in transmission cluster dynamics between subtype B and circulating recombinant form 01_AE (CRF01_AE). Separate phylogenetic trees were estimated using 2919 subtype B and 473 CRF01_AE sequences sampled between 2004 and 2018 in combination with global sequence data and NSW‐specific clades were classified as clusters, pairs or singletons. Significant differences in demographics between subtypes were assessed with Chi‐Square statistics. Results We identified 104 subtype B and 11 CRF01_AE growing clusters containing a maximum of 29 and 11 sequences for subtype B and CRF01_AE respectively. We observed a > 2‐fold increase in the number of NSW‐specific CRF01_AE clades over time. Subtype B clusters were associated with individuals reporting men who have sex with men (MSM) as their transmission risk factor, being born in Australia, and being diagnosed during the early stage of infection (p 1.5 sequences / 6‐months) and which consisted of a majority of infections among MSM. We also found four active growing CRF01_AE clusters containing only infections among MSM. Finally, we found 47 subtype B and seven CRF01_AE clusters that contained a large gap in time (>1 year) between infections and may be indicative of intermediate transmissions via undiagnosed individuals. Conclusions The large number of active and growing clusters among MSM are the driving force of the ongoing epidemic in NSW for subtype B and CRF01_AE.
- Published
- 2021
- Full Text
- View/download PDF
44. Estimation of potential hiv transmission risk in recent anal intercourse events among men who have sex with men and transgender women in bali, indonesia
- Author
-
Bavinton, BR, Mahendra, IGAA, Kaldor, J, Law, M, Grulich, AE, Januraga, PP, Bavinton, BR, Mahendra, IGAA, Kaldor, J, Law, M, Grulich, AE, and Januraga, PP
- Abstract
In recent years, prevalence of Human Immunodeficiency Virus (HIV) has increased sub-stantially in Bali, Indonesia, in men who have sex with men (MSM) and transgender women, known locally as ‘waria’. There are limited behavioural data in this population. We conducted a behavioural survey of MSM/waria in Bali in March–April 2018. Respondents were primarily recruited by HIV outreach workers. Respondents reported details about anal intercourse events with their last male/waria romantic partner and/or last male/waria casual partner (respondents could report on both if relevant). Statistical significance was tested with generalised estimating equations. Among 709 participants, median age was 27 (interquartile range = 24–31), and 92.1% were male and 7.9% were waria. One-third were born in Bali. Overall, 85.9% had ever had an HIV test; 55.1% reported being HIV-negative, 15.0% HIV-positive, and 30.0% had unknown serostatus. Most (86.5%) reported sex with men, 9.5% with waria, and 20.0% with women in the previous 6 months. Respondents described 703 anal intercourse events (397/306 with romantic/casual partners, re-spectively; 191 reported on both). Over half (56.5%) of the events were protected by condoms and 7.3% by biomedical prevention (2.6% by PrEP in either partner, 4.7% by HIV treatments in either partner). Thus, 36.3% of events involved unprotected condomless anal intercourse (40.8%/30.4% in romantic/casual partners, respectively). In multivariate analysis, unprotected condomless anal intercourse events were associated with romantic partners (p < 0.001), being born in Bali (p = 0.002), lower education (p = 0.013), believing that withdrawal before ejaculation is effective (p < 0.001), liking to use withdrawal (p = 0.021), and not liking condoms (p < 0.001). One-quarter of events had potentially reduced HIV transmission risk through non-condom-based risk reduction strategies, while 11.1% had no potential risk reduction. Events presenting the highest potential risk of HIV
- Published
- 2021
45. What does PrEP mean for 'safe sex' norms? A qualitative study
- Author
-
Haire, B, Murphy, D, Maher, L, Zablotska-Manos, I, Vaccher, S, Kaldor, J, Haire, B, Murphy, D, Maher, L, Zablotska-Manos, I, Vaccher, S, and Kaldor, J
- Abstract
While HIV pre-exposure prophylaxis (PrEP) is highly effective, it has arguably disrupted norms of 'safe sex' that for many years were synonymous with condom use. This qualitative study explored the culture of PrEP adoption and evolving concepts of 'safe sex' in Sydney, Australia, during a period of rapidly escalating access from 2015-2018, drawing on interviews with sexually active gay men (n = 31) and interviews and focus groups with key stakeholders (n = 10). Data were analysed thematically. Our results explored the decreasing centrality of condoms in risk reduction and new patterns of sexual negotiation. With regards to stigma, we found that there was arguably more stigma related to not taking PrEP than to taking PrEP in this sample. We also found that participants remained highly engaged with promoting the wellbeing of their communities through activities as seemingly disparate as regular STI testing, promotion of PrEP in their social circles, and contribution to research. This study has important implications for health promotion. It demonstrates how constructing PrEP as a rigid new standard to which gay men 'should' adhere can alienate some men and potentially create community divisions. Instead, we recommend promoting choice from a range of HIV prevention options that have both high efficacy and high acceptability.
- Published
- 2021
46. Increased targeted HIV testing and reduced undiagnosed HIV infections among gay and bisexual men
- Author
-
Patel, PG, Keen, P, McManus, H, Duck, T, Callander, D, Selvey, C, Power, C, Gray, RT, Knight, V, Asselin, J, Read, P, Johnson, K, Bavinton, BR, Bowden, VJ, Grulich, AE, Guy, R, Grulich, A, Prestage, G, Zablotska, I, Holden, J, Cooper, C, Price, K, Holt, M, de Wit, J, Kaldor, J, Kelleher, A, Wilson, D, Brotherton, A, Cooper, DA, Crooks, L, Whittaker, B, Madeddu, D, Schmidt, HM, Telfer, B, Boyd, M, McGill, S, Pinto, A, Nigro, S, Gordon, T, Feeney, L, Cunningham, P, Mao, L, Gray, J, O’Dwyer, M, Clifton, B, Patel, PG, Keen, P, McManus, H, Duck, T, Callander, D, Selvey, C, Power, C, Gray, RT, Knight, V, Asselin, J, Read, P, Johnson, K, Bavinton, BR, Bowden, VJ, Grulich, AE, Guy, R, Grulich, A, Prestage, G, Zablotska, I, Holden, J, Cooper, C, Price, K, Holt, M, de Wit, J, Kaldor, J, Kelleher, A, Wilson, D, Brotherton, A, Cooper, DA, Crooks, L, Whittaker, B, Madeddu, D, Schmidt, HM, Telfer, B, Boyd, M, McGill, S, Pinto, A, Nigro, S, Gordon, T, Feeney, L, Cunningham, P, Mao, L, Gray, J, O’Dwyer, M, and Clifton, B
- Abstract
Objectives: To evaluate the impact of government HIV strategies that aimed to increase HIV testing uptake and frequency among gay and bisexual men (GBM) in New South Wales (NSW), Australia. Design: We analysed HIV testing data from existing passive and sentinel surveillance systems between 2010 and 2018. Methods: Six indicators were measured: (1) state-wide total HIV laboratory tests; (2) number of GBM attending publicly-funded clinics; (3) 12-monthly testing uptake; (4) annual testing frequency; (5) HIV testing with a STI diagnosis; and (6) HIV positivity. Mathematical modelling was used to estimate (7) the proportion of men with undiagnosed HIV. Indicators were stratified by Australian vs. overseas-born. Results: Overall, 43,560 GBM attended participating clinics (22,662 Australian-born, 20,834 overseas-born) from 2010-2018. Attendees increased from 5,186 in 2010 to 16,507 in 2018. There were increasing trends (p<0.001 for all) in testing uptake (83.9% to 95.1%); testing with a STI diagnosis (68.7% to 94.0%); annual HIV testing frequency (1.4 to 2.7); and a decreasing trend (p<0.01) in HIV positivity (1.7% to 0.9%).Increases in testing were similar in Australian-born and overseas-born GBM. However, there were decreasing trends in the estimated undiagnosed HIV proportion overall (9.5% to 7.7%) and in Australian-born GBM (7.1% to 2.8%), but an increasing trend in overseas-born GBM (15.3% to 16.9%) (p<0.001 for all).
- Published
- 2021
47. Subtype-specific differences in transmission cluster dynamics of HIV-1 B and CRF01_AE in New South Wales, Australia
- Author
-
Di Giallonardo, F, Pinto, AN, Keen, P, Shaik, A, Carrera, A, Salem, H, Selvey, C, Nigro, SJ, Fraser, N, Price, K, Holden, J, Lee, FJ, Dwyer, DE, Bavinton, BR, Geoghegan, JL, Grulich, AE, Kelleher, AD, Guy, R, Prestage, G, Zablotska, I, Duck, T, Cooper, C, Holt, M, de Wit, J, Kaldor, J, Wilson, D, Brotherton, A, Cooper, DA, Crooks, L, Whittaker, B, Callander, D, Madeddu, D, Schmidt, HM, Telfer, B, Boyd, M, McGill, S, Patel, P, Power, C, Pinto, A, Nigro, S, Gordon, T, Feeney, L, Bath, K, Mackie, B, Di Giallonardo, F, Pinto, AN, Keen, P, Shaik, A, Carrera, A, Salem, H, Selvey, C, Nigro, SJ, Fraser, N, Price, K, Holden, J, Lee, FJ, Dwyer, DE, Bavinton, BR, Geoghegan, JL, Grulich, AE, Kelleher, AD, Guy, R, Prestage, G, Zablotska, I, Duck, T, Cooper, C, Holt, M, de Wit, J, Kaldor, J, Wilson, D, Brotherton, A, Cooper, DA, Crooks, L, Whittaker, B, Callander, D, Madeddu, D, Schmidt, HM, Telfer, B, Boyd, M, McGill, S, Patel, P, Power, C, Pinto, A, Nigro, S, Gordon, T, Feeney, L, Bath, K, and Mackie, B
- Abstract
Introduction: The human immunodeficiency virus 1 (HIV-1) pandemic is characterized by numerous distinct sub-epidemics (clusters) that continually fuel local transmission. The aims of this study were to identify active growing clusters, to understand which factors most influence the transmission dynamics, how these vary between different subtypes and how this information might contribute to effective public health responses. Methods: We used HIV-1 genomic sequence data linked to demographic factors that accounted for approximately 70% of all new HIV-1 notifications in New South Wales (NSW). We assessed differences in transmission cluster dynamics between subtype B and circulating recombinant form 01_AE (CRF01_AE). Separate phylogenetic trees were estimated using 2919 subtype B and 473 CRF01_AE sequences sampled between 2004 and 2018 in combination with global sequence data and NSW-specific clades were classified as clusters, pairs or singletons. Significant differences in demographics between subtypes were assessed with Chi-Square statistics. Results: We identified 104 subtype B and 11 CRF01_AE growing clusters containing a maximum of 29 and 11 sequences for subtype B and CRF01_AE respectively. We observed a > 2-fold increase in the number of NSW-specific CRF01_AE clades over time. Subtype B clusters were associated with individuals reporting men who have sex with men (MSM) as their transmission risk factor, being born in Australia, and being diagnosed during the early stage of infection (p < 0.01). CRF01_AE infections clusters were associated with infections among individuals diagnosed during the early stage of infection (p < 0.05) and CRF01_AE singletons were more likely to be from infections among individuals reporting heterosexual transmission (p < 0.05). We found six subtype B clusters with an above-average growth rate (>1.5 sequences / 6-months) and which consisted of a majority of infections among MSM. We also found four active growing CRF01_AE clusters contai
- Published
- 2021
48. Working with Aboriginal young people in sexual health research: a peer research methodology in remote Australia
- Author
-
Bell, S, Aggleton, P, Lockyer, A, Ferguson, T, Murray, W, Silver, B, Kaldor, J, Maher, L, Ward, J, Bell, S, Aggleton, P, Lockyer, A, Ferguson, T, Murray, W, Silver, B, Kaldor, J, Maher, L, and Ward, J
- Abstract
In a context of ongoing colonization and dispossession in Australia, many Aboriginal people live with experiences of health research that is done “on” rather than “with” or “by” them. Recognizing the agency of young people and contributing to Aboriginal self-determination and community control of research, we used a peer research methodology involving Aboriginal young people as researchers, advisors, and participants in a qualitative sexual health study in one remote setting in the Northern Territory, Australia. We document the methodology, while critically reflecting on its benefits and limitations as a decolonizing method. Findings confirm the importance of enabling Aboriginal young people to play a central role in research with other young people about their own sexual health. Future priorities include developing more enduring forms of coinvestigation with Aboriginal young people beyond data collection during single studies, and support for young researchers to gain formal qualifications to enhance future employability.
- Published
- 2021
49. Surveillance systems for monitoring cervical cancer elimination efforts: Focus on HPV infection, cervical dysplasia, cervical screening and treatment
- Author
-
Brotherton, JML, Wheeler, C, Clifford, GM, Elfstrom, M, Saville, M, Kaldor, J, Machalek, DA, Brotherton, JML, Wheeler, C, Clifford, GM, Elfstrom, M, Saville, M, Kaldor, J, and Machalek, DA
- Abstract
In order to achieve the global elimination of cervical cancer as a public health problem, close surveillance of progress in public health and clinical activities and outcomes across the three pillars of vaccination, screening and treatment will be required. Surveillance should ideally occur within an integrated system that is planned, funded, and regularly evaluated to ensure it is providing timely, accurate and relevant feedback for action. In this paper, we conceptualise the main public health surveillance objectives as process and outcome measures in each of the three pillars. Process measures include coverage/participation measures for vaccination, screening and treatment alongside the ongoing assessment of the quality and reach of these programs and activities. Outcome measures related to the natural history of human papillomavirus (HPV) infection include HPV infection prevalence, precursor cervical lesions and cervical cancers (including stage at diagnosis, cancer incidence and mortality). These outcome measures can be used for monitoring the effectiveness of the three core activities in the short, medium and long term to assess whether these interventions are effectively reducing their occurrence. We discuss possible methods for the surveillance of these measures in the context of country capacity, drawing from examples in Australia, the USA and in low and middle income countries.
- Published
- 2021
50. Conjunctival Scarring, Corneal Pannus, and Herbert's Pits in Adolescent Children in Trachoma-endemic Populations of the Solomon Islands and Vanuatu
- Author
-
Butcher, R, Tagabasoe, J, Manemaka, J, Bong, A, Garae, M, Daniel, L, Roberts, C, Handley, BL, Hu, VH, Harding-Esch, EM, Bakhtiari, A, Willis, R, Muller, A, Kaldor, J, Le Mesurier, R, Mabey, D, Cama, A, Sokana, O, Taleo, F, Taylor, HR, Solomon, AW, Butcher, R, Tagabasoe, J, Manemaka, J, Bong, A, Garae, M, Daniel, L, Roberts, C, Handley, BL, Hu, VH, Harding-Esch, EM, Bakhtiari, A, Willis, R, Muller, A, Kaldor, J, Le Mesurier, R, Mabey, D, Cama, A, Sokana, O, Taleo, F, Taylor, HR, and Solomon, AW
- Abstract
BACKGROUND: In the Solomon Islands and Vanuatu, the sign trachomatous inflammation-follicular (TF) is common, but ocular infection with Chlamydia trachomatis is not. It is therefore debatable whether azithromycin mass drug administration (MDA), the recommended antibiotic treatment strategy for trachoma's elimination as a public health problem, is necessary in this setting. We set out to estimate what proportion of adolescents were at risk of progression of trachomatous scarring. METHODS: A cross-sectional survey was undertaken of all children aged 10-14 years resident in communities identified as high-TF clusters during previous population-based mapping. Graders examined children for clinical evidence of trachomatous scarring, pannus, and Herbert's pits (HPs) or limbal follicles in both eyes. A dried blood spot was collected from each child and tested for antibodies to C. trachomatis. RESULTS: A total of 492 children in 24 villages of the Solomon Islands and Vanuatu were examined. In total, 35/492 (7%) of children had limbal signs (pannus and/or HPs) plus any conjunctival scarring. And 9/492 (2%) had limbal signs and moderate or severe conjunctival scarring; 22% of children were anti-Pgp3 seropositive. CONCLUSIONS: Few adolescents here are at risk of future complications from trachoma, supporting the conclusion that further antibiotic MDA is not currently required for trachoma elimination purposes in these settings.
- Published
- 2021
Catalog
Discovery Service for Jio Institute Digital Library
For full access to our library's resources, please sign in.