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The article examines the relationship between annual rainfall and outbreaks of blackleg in cattle in Zaria, Nigeria. Using Pearson's correlation statistics, it was found that there is a positive and significant correlation between the two entities. Thus, the higher the annual rainfall, the greater outbreaks of blackleg in cattle appear.

The article discusses the problems associated with psychoactive substance use by motorcyclists in Abeokuta, Nigeria. It informs that use of psychoactive substance by motorcyclists is a matter of concern in terms of health hazards and the safety of the commuters. It also informs that government should screen commercial motorcyclists for drug use and implement educational programs to improve their knowledge about its harmful effects.

In an attempt to determine the seroprevalence of avian leukosis virus (ALV) in exotic broiler chickens and Nigerian local chickens in Zaria, Nigeria, a total of 600 sera (300 from exotic broiler chickens and 300 from Nigerian local chickens), obtained from the live bird market in Zaria, Nigeria, were tested for ALVp27 antigen by the antigen capture - enzyme linked immunosorbent assay (ac-ELISA) technique. The age range of the Nigerian local chickens sampled in this study was 6 - 24 months, while that of the exotic broiler chickens used in this study was 2-3 months. Fourteen out of the 300 sera obtained from the exotic broiler chickens tested positive to ALV p27 antigen, which represents 4.70%, while 180 of the 300 Nigerian local chicken sera were confirmed positive to the antigen, representing 60.00%. Thirteen (92.86%) of the fourteen sera from the exotic broiler chickens were lowly positive (ELISA Units range of 10-20%) to ALV p27 antigen, while only one (7.14%) serum sample was moderately positive to ALV p27 antigen with an ELISA Unit of 29.33%. Of the 180 sera from the Nigerian local chickens that tested positive to ALVp27 antigen , 79 (43.89%) were lowly positive with ELISA Units ranging from 10.67% to 21.33%, while 101 (56.11%) serum samples were moderately positive to ALVp27 antigen with ELISAUnits ranging from 28.0% to 73.33%. Ahigher seroprevalence of ALVwas detected in Nigerian local chickens than the exotic broiler chickens. [ABSTRACT FROM AUTHOR]

Purpose: To determine the prevalence and causes of blindness and visual impairment among adults in Kogi, Nigeria., Methods: A Rapid assessment of avoidable blindness (RAAB) protocol was used with additional tools measuring disability and household wealth to measure the prevalence of blindness and visual impairment (VI) and associations with sex, disability, wealth, cataract surgical coverage and its effectiveness., Results: Age- and sex-adjusted all-cause prevalence of bilateral blindness was 3.6% (95%CI 3.0-4.2%), prevalence of blindness among people living with additional, non-visual disabilities was 38.3% (95% CI 29.0-48.6%) compared to 1.6% (95%CI 1.2-2.1%; [Formula: see text] = 771.9, p<0.001) among people without additional disabilities. Cataract was the principal cause of bilateral blindness (55.3%). Cataract surgical coverage (CSC) at visual acuity (VA) 3/60 was 48.0%, higher among men than women (53.7% vs 40.3%); 12.0% among people with non-visual disabilities; 66.9% among people without non-visual disabilities, being higher among people in the wealthiest two quintiles (41.1%) compared to the lowest three (24.3%). Effective Cataract Surgical Coverage at Visual Acuity 6/60 was 31.0%, higher among males (34.9%) than females (25.5%), low among people with additional, non-visual disabilities (1.9%) compared to people with no additional disabilities (46.2%). Effective CDC was higher among people in the wealthiest two quintiles (411%) compared to the poorest three (24.3%). Good surgical outcome (VA>6/18) was seen in 61 eyes (52.6%) increasing to 71 (61.2%) eyes with best correction. Cost was identified as the main barrier to surgery., Conclusion: Findings suggest there exists inequalities in eye care with women, poorer people and people with disabilities having a lower Cataract Surgical Coverage, thereby, underscoring the importance of eye care programs to address these inequalities., Competing Interests: The authors report there are no competing interests to declare., (Copyright: © 2024 Penzin et al. This is an open access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.)

Background: Infant mortality persists as a global public health concern, particularly in lower-middle-income countries (LIMCs) such as Nigeria. The risk of an infant dying before one year of age is estimated to be six times higher in Africa than in Europe. Nigeria recorded an infant mortality rate of 72.2 deaths per 1,000 live births in 2020, in contrast to the global estimate of 27.4 per 1,000 live births. Several studies have been undertaken to determine the factors influencing infant mortality., Objective: This scoping review sought to identify and summarise the breadth of evidence available on factors associated with infant mortality in Nigeria., Methods: This review followed the five-stage principles of Arksey and O'Malley's framework. Four electronic databases were searched with no limit to publication date or study type: Ovid MEDLINE, PubMed, CINAHL Complete, and Web of Science. Selected studies were imported into Endnote software and then exported to Rayyan software where duplicates were removed. Included articles were thematically analysed and synthesised using the socioecological model., Results: A total of 8,139 references were compiled and screened. Forty-eight articles were included in the final review. At the individual level, maternal- and child-related factors were revealed to influence infant mortality; socioeconomic and sociocultural factors at the interpersonal level; provision and utilisation of health services, health workforce, hospital resources and access to health services at the organisational level; housing/neighbourhood and environmental factors at the community level; and lastly, governmental factors were found to affect infant mortality at the public policy level., Conclusion: Factors related to the individual, interpersonal, organisational, community and public policy levels were associated with infant mortality in Nigeria., Competing Interests: The authors have declared that no competing interests exist., (Copyright: © 2023 Nwanze et al. This is an open access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.)

Background: Adolescent pregnancy is a global public health and social problem that affects both developed and developing countries. Reducing adolescent pregnancy is central to achieving sustainable development goals. In 2021 Nigeria's Adolescent pregnancy was 106 per 1000 and showed an increasing rate. This study, therefore, aims to explore the literature to map the risk factors and interventions against adolescent pregnancy in Nigeria., Method: A scoping review of studies published between January 2007 and December 2022 using PubMed, Web of Science and Africa Journals Online were searched using the keywords' adolescent pregnancy' AND 'Nigeria'. Studies were screened using the eligibility criteria., Results: A total of 241 articles, of which 229 were identified through the databases and 12 were identified through hand search. After the full-text review, 28 studies met the inclusion criteria and were included in the final review. In Nigeria, the prevalence of adolescent pregnancy is between 7.5 and 49.5%. Associated factors for adolescent pregnancy in Nigeria are multifactorial, including individual, community, societal, school, family, and peer factors. Policies on adolescent sexual and reproductive health exist in Nigeria. Still, the policies need more sponsorship, implementation, and monitoring, while only some interventions on adolescent pregnancy majorly based on contraceptives and education of health providers are available in Nigeria., Conclusion: Associated factors for adolescent Pregnancy in Nigeria are multidimensional, with educational attainment and wealth index being the highest associated factor. Intervention strategies aimed at the educational level have been identified as a critical factor in curbing adolescent pregnancy. Thus, policies on sexual, reproductive, and mental health development specifically targeting adolescents to reduce the cycle of societal dependence by empowering this group economically and educationally are justifiably warranted., (© 2023. The Author(s).)

Background: Congenital hypothyroidism is one of the most common preventable causes of mental retardation and clinical manifestations are often subtle or absent at birth and hence the need for screening. Implementation of newborn screening requires local normative values., Objectives: To determine the normative values of cord Thyroid Stimulating Hormone (TSH) among term babies in Bauchi, Northeast Nigeria and compare it with that from other centers in Nigeria., Methodology: Cord blood samples from 200 term babies were analyzed for TSH by Fluorescence Immunoassay technique in this descriptive cross-sectional study. A cut-off of >20 µIU/ml was used for recall. The mean and range were determined and compared with those of previous local studies using t-test. Impact of some maternal and infant factors on TSH was also assessed., Results: The overall mean (SD) cord TSH was 3.74 (±1.99) µIU/ ml and the range was 0.73 to 15.22 µIU/ml (2.5th to 97.5th centile) and none had TSH > 20 µIU/ml and hence our recall rate was 0%. The mean cord TSH was comparable to that reported by a lone local multicenter study (p = 0.120) but significantly different from that of 3 other local studies (p < 0.001). There was also no significant difference between the means of different gender, birth weight groups, mode of delivery, socio-economic classes, maternal age and parity., Conclusion: The Cord blood TSH level of most term newborn in Bauchi, similar to other Nigerian studies, is < 10 µIU/ml with a few but significant percentage recording cord TSH level > 10 µIU/ml. Gender, birth weight, mode of delivery, socio-economic class, maternal age and parity were not significantly related to cord TSH level. The mean blood TSH values from different studies across the country tend to vary based on the assay technique. We recommend a nationwide multicenter study with a much larger sample size, lower cutoff value for recall and a unified sample processing laboratory if national normative values are to be developed., Competing Interests: The Authors declare that no competing interest exists., (Copyright © 2022 by West African Journal of Medicine.)

Cataract is a leading cause of blindness in children worldwide. Blindness can be treated with effective surgery, but in low-resource settings this treatment can be difficult to access. In addition, positive outcomes of the surgery are heavily dependent on comprehensive postoperative care. To date in Nigeria and many other low-resource countries, robust electronic data-management systems that help facility teams to manage their patient data, especially when it comes to tracking children for follow-up visits after surgery, have either yet to be put into place or are in place but have yet to be refined to respond to the specific needs of eye care programs. Sightsavers has worked with multiple state ministries in Nigeria to set up and test a system that responds to those needs., (© The Author(s) 2022. Published by Oxford University Press on behalf of Royal Society of Tropical Medicine and Hygiene.)

Black women across the African diaspora experience more aggressive breast cancer with higher mortality rates than white women of European ancestry. Although inter-ethnic germline variation is known, differential somatic evolution has not been investigated in detail. Analysis of deep whole genomes of 97 breast cancers, with RNA-seq in a subset, from women in Nigeria in comparison with The Cancer Genome Atlas (n = 76) reveal a higher rate of genomic instability and increased intra-tumoral heterogeneity as well as a unique genomic subtype defined by early clonal GATA3 mutations with a 10.5-year younger age at diagnosis. We also find non-coding mutations in bona fide drivers (ZNF217 and SYPL1) and a previously unreported INDEL signature strongly associated with African ancestry proportion, underscoring the need to expand inclusion of diverse populations in biomedical research. Finally, we demonstrate that characterizing tumors for homologous recombination deficiency has significant clinical relevance in stratifying patients for potentially life-saving therapies., (© 2021. The Author(s).)

Somatic mutation signatures may represent footprints of genetic and environmental exposures that cause different cancer. Few studies have comprehensively examined their association with germline variants, and none in an indigenous African population. SomaticSignatures was employed to extract mutation signatures based on whole-genome or whole-exome sequencing data from female patients with breast cancer (TCGA, training set, n = 1,011; Nigerian samples, validation set, n = 170), and to estimate contributions of signatures in each sample. Association between somatic signatures and common single nucleotide polymorphisms (SNPs) or rare deleterious variants were examined using linear regression. Nine stable signatures were inferred, and four signatures (APOBEC C>T, APOBEC C>G, aging and homologous recombination deficiency) were highly similar to known COSMIC signatures and explained the majority (60-85%) of signature contributions. There were significant heritable components associated with APOBEC C>T signature (h 2 = 0.575, p = 0.010) and the combined APOBEC signatures (h 2 = 0.432, p = 0.042). In TCGA dataset, seven common SNPs within or near GNB5 were significantly associated with an increased proportion (beta = 0.33, 95% CI = 0.21-0.45) of APOBEC signature contribution at genome-wide significance, while rare germline mutations in MTCL1 was also significantly associated with a higher contribution of this signature (p = 6.1 × 10 -6 ). This is the first study to identify associations between germline variants and mutational patterns in breast cancer across diverse populations and geography. The findings provide evidence to substantiate causal links between germline genetic risk variants and carcinogenesis., (© 2019 The Authors. International Journal of Cancer published by John Wiley & Sons Ltd on behalf of UICC.)

Introduction: Her-2/neu is one of the most important molecular markers of breast cancer. Overexpression of Her-2/neu as evaluated by immunohistochemistry is necessary in the management of breast cancers. This study was performed to determine the proportion of expression of the biomarker amongst breast cancer patients who presented in our 'one-stop breast cancer unit' using automated immunohistochemistry., Materials and Methods: Automated immunohistochemical analysis of 107 newly diagnosed breast cancer patients was done for expression of Her-2/neu, between 1st April, 2016 and 30th September, 2018. The data was analyzed using SPSS version 25 for windows and Microsoft excel, 2013., Results: Her-2/neu was overexpressed in 30.1% patients, and it shows no correlation with age and histological grade of the disease., Conclusion: There is overexpression of Her-2/neu in our local setting, and this observation is very relevant to any therapeutic decisions and management of these patients., (Copyright © 2019 The Authors. Published by Elsevier Ltd.. All rights reserved.)

Racial/ethnic disparities in breast cancer mortality continue to widen but genomic studies rarely interrogate breast cancer in diverse populations. Through genome, exome, and RNA sequencing, we examined the molecular features of breast cancers using 194 patients from Nigeria and 1037 patients from The Cancer Genome Atlas (TCGA). Relative to Black and White cohorts in TCGA, Nigerian HR + /HER2 - tumors are characterized by increased homologous recombination deficiency signature, pervasive TP53 mutations, and greater structural variation-indicating aggressive biology. GATA3 mutations are also more frequent in Nigerians regardless of subtype. Higher proportions of APOBEC-mediated substitutions strongly associate with PIK3CA and CDH1 mutations, which are underrepresented in Nigerians and Blacks. PLK2, KDM6A, and B2M are also identified as previously unreported significantly mutated genes in breast cancer. This dataset provides novel insights into potential molecular mechanisms underlying outcome disparities and lay a foundation for deployment of precision therapeutics in underserved populations.

After the successful roll out of MenAfriVac, Nigeria has experienced sequential meningitis outbreaks attributed to meningococcus serogroup C (NmC). Zamfara State in North-western Nigeria recently was at the epicentre of the largest NmC outbreak in the 21 st Century with 7,140 suspected meningitis cases and 553 deaths reported between December 2016 and May 2017. The overall attack rate was 155 per 100,000 population and children 5-14 years accounted for 47% (3,369/7,140) of suspected cases. The case fatality rate (CFR) among children 5-9 years was 10%, double that reported among adults ≥ 30 years (5%). NmC and pneumococcus accounted for 94% (172/184) and 5% (9/184) of the laboratory-confirmed cases, respectively. The sequenced NmC belonged to the ST-10217 clonal complex (CC). All serotyped pneumococci were PCV10 serotypes. The emergence of NmC ST-10217 CC outbreaks threatens the public health gains made by MenAfriVac, which calls for an urgent strategic action against meningitis outbreaks.

Purpose: Direct medical and non-medical costs incurred by those undergoing subsidised cataract surgery at Gusau eye clinic, Zamfara state, were recently determined. The aim of this study was to assess the willingness to pay for cataract surgery among adults with severe visual impairment or blindness from cataract in rural Zamfara and to compare this to actual costs., Methods: In three rural villages served by Gusau eye clinic, key informants helped identify 80 adults with bilateral severe visual impairment or blindness (<6/60), with cataract being the cause in at least one eye. The median amount participants were willing to pay for cataract surgery was determined. The proportion willing to pay actual costs of the (i) subsidised surgical fee (US$18.5), (ii) average non-medical expenses (US$25.2), and (iii) average total expenses (US$51.2) at Gusau eye clinic were calculated. Where participants would seek funds for surgery was determined., Results: Among 80 participants (38% women), most (n = 73, 91%) were willing to pay something, ranging from

The purpose of this project is to evaluate the suitability of different sites as locations for obtaining underground water for consumption. The analysis of ²³⁸U, ²³²Th and ⁴⁰K from rock samples from each layer of borehole at a depth of ∼50 m at Site A borehole, S3L1-S3L6 in Gosa and 40 m at Site B borehole, S4L1-S4L5 in Lugbe, Abuja, north central Nigeria is presented. The gamma-ray spectrometry was carried out using a high-purity germanium detector coupled to a computer-based high-resolution multichannel analyzer. The activity concentrations at Site A borehole for ²³⁸U have a mean value of 26 ± 3, ranging from 23 ± 2 to 30 ± 3 Bq kg⁻¹, ²³²Th a mean value of 63 ± 5, ranging from 48 ± 4 to 76 ± 6 Bq kg⁻¹ and ⁴⁰K a mean value of 573 ± 72, ranging from 437 ± 56 to 821 ± 60 Bq kg⁻¹. The activity concentrations at Site B borehole for ²³⁸U have a mean value of 20 ± 2, ranging from 16 ± 2 to 23 ± 2 Bq kg⁻¹, ²³²Th a mean value of 46 ± 4, ranging from 43 ± 4 to 49 ± 4 Bq kg⁻¹, ⁴⁰K a mean value of 915 ± 116 and ranging from 817 ± 103 Bq kg⁻¹ to 1011 ± 128 Bq kg⁻¹. It is noted that the higher activity concentrations of ²³²Th and ²³⁸U are found in Site A at Gosa. Site B has lower radioactivity, and it is recommended that both sites are suitable for underground water consumption.

We evaluated the effects of selected socio-demographic factors on late presentation and reasons why our breast cancer patients delay reporting for treatment. All female breast cancer patients referred to one of the general surgery out-patient clinics of Lagos State University Teaching Hospital between January 2009 and December 2010 were interviewed. Relevant socio-demographic and clinical data were obtained and reasons for patient delay documented. Univariate and multivariate logistic regression analyses were conducted to calculate odd ratio for delay. A total of 201 patients were enrolled. Mean duration of symptoms was 12.12 months (SD ± 5.18). Delay for more than 3 months before initial medical consultation was observed in 164 patients (81.6%). Increased risk of late presentation was associated with single women (OR=2.054), primary level of education (OR=3.059), negative history of benign breast disease (OR=1.648) and pre-menopause (OR=1.861). Ignorance of the nature of illness, belief in spiritual healing, fear of mastectomy and belief in herbal treatment were the leading reasons for delay. Women with higher risk of late presentation should be the target group during interventions aimed at raising breast cancer awareness. Reasons for patient delay should also be addressed., (Copyright © 2012 Elsevier Ltd. All rights reserved.)

Background: Attracting the best medical graduates to trauma-related specialties is pivotal for excellent injury management in future, especially with the rising global incidence of injuries. We sought to explore the interest of Nigerian medical students and interns in Orthopaedics, Cardiothoracic, Neurological, Burns and Plastic and General Surgery specialties., Methods: A cross-sectional study was conducted using a self-administered questionnaire to assess interest in selected trauma-related specialties among 177 senior medical students and interns at the Lagos State University Teaching Hospital and Lagos University Teaching Hospital in Lagos, Nigeria. Stratified random sampling method was employed and Chi-square test was performed in data analysis using SPSS v15.0 statistical package., Results: Majority (80%) showed interest in post-graduate specialization. Surgery topped the list of specialties chosen by participants while 55% were likely to choose one of the selected trauma-related specialties. Exposure to positive role models, male gender and being single were significantly associated with interest in trauma-related future career. Opportunities for career fulfilment, carrying out difficult procedures, research and discovery, intellectual challenges during practice, use of modern technology, financial remuneration of specialists, patient outcomes and previous theatre experience had significant positive influence on participants who had strong interest in trauma-related specialty. Lifestyle issues like workload, call schedules, stress and duration of residency, training conditions and facilities and time commitment to practice had negative influence on choice of specialty., Conclusion: Interest of medical students and interns in trauma-related specialties may be sustained and enhanced by practicing surgeons through mentoring and by serving as role models. Training programs in surgery should be revisited and made less stressful while lifestyle issues need to be made more favourable., (Copyright © 2012 Surgical Associates Ltd. Published by Elsevier Ltd. All rights reserved.)

Background: We sought to evaluate selected risk factors for development of inguinal hernia in adult male Nigerians in a hospital based case control study. The aim was to identify the risks for this condition in our population. This may assist in instituting appropriate preventive measures towards early detection and treatment., Methods: All male patients aged 18 years and above who presented with primary inguinal hernia at the General Surgical clinic of Ikorodu General Hospital between April 2009 and March 2011 were enrolled into the study as cases. Control subjects were selected randomly from the general out-patient clinic. Participants were interviewed during their first clinic attendance using a standardised questionnaire to record their bio-data and the presence or absence of the risk factors. All study cases had hernia repair and the type of hernia, whether indirect or direct was determined and documented. SPSS version 15.0 was used in the statistical analysis and the risk factors among the cases and controls were compared using univariate and multivariate logistic regression analysis., Results: A total number of 404 male patients were interviewed. Two hundred and two were the cases while the remaining 202 were the controls. Significant risk factors for inguinal hernia were positive family history of inguinal hernia (p < 0.001 and strenuous work activities (p < 0.001). Among the cases, 132 (65.3%) had indirect hernia while the remaining 70 (34.7%) had direct hernia. Positive family history (p = 0.011) and straining during urination or defecation (p = 0.047) were the factors significantly associated with the type of hernia., Conclusion: Family history of inguinal hernia and strenuous work activity are the significant risk factors for this condition in our setting. Public health initiatives targeting those at higher risk of hernia development may help early detection and treatment; thereby reducing morbidity and mortality from this condition., (Copyright © 2012 Surgical Associates Ltd. Published by Elsevier Ltd. All rights reserved.)

Background: Children are the most risk prone in cases of burns. The previous epidemiologic study of paediatric burns in Lagos-Nigeria was carried four decades ago. A new study becomes necessary in view of the increasing incidences of petroleum related fire disasters in Nigeria., Patients and Methods: : Children up to the age of 14 years admitted for major burns at the Lagos State University Teaching Hospital (LASUTH), Ikeja-Lagos, Nigeria between January 1, 2004 and December 31, 2008 were studied. Information about the demographics, mechanism/circumstances of burns, associated injuries, surface extent (TBSA) and depth, modes of management and outcome, length of admission, and post mortem findings in cases of death were collected., Results: : A total of 298 children with major burns were seen; 198 were males and 100 females. The ages ranged from 1 day to 14 years with mean of 4.56 ± 3.95 years. Forty percent of the cases occurred among the toddlers and 25.5% in the 2-5 years age group. Fire was the leading cause of burns, occurring in 198 (66.4%) cases. The TBSA ranged from 1% to 100% with mean of 29.67 ± 21.98. The mortality rate was 29.9%. Autopsy showed asphyxia as the primary cause of death in 14 (48.27%) cases, multiple organ dysfunctions in 27.59% and septicaemia in 13.79%., Conclusion: This study identifies the main causes of paediatric burns and the major factors responsible for morbidity and mortality at the present time in a low income country. The level of awareness about burns prevention among the populace and health care facilities should be improved., (Copyright © 2010 Elsevier Ltd and ISBI. All rights reserved.)

Mushrooms are macrofungi widely consumed as food. However, many mushrooms rot away in the wild because of fear of toxicity. Therefore, lyophilized aqueous extracts of 6 mushroom species collected from Zaria, Nigeria and taxonomically identified as Chlorophyllum molybdites, Panaeolus subalteatus, Macrolepiota procera, Leucopaxillus albissmus, Hygrophoropsis aurantiacus and Pholiota aurea were screened for toxicity in mice. Lyophilized aqueous extract of each of these mushrooms was administered to three groups of 3 mice intraperitoneally (i.p.) at doses of 100, 1000 and 10, 000 mg kg(-1), respectively. Another group of three mice given distilled water served as control. The mice were examined for clinical signs of toxicity over a period of 72 h and pathological examinations conducted on dead animals. The severity of clinical signs, onset of death and pathological lesions were dose dependent. Death occurred within 10 min in all the mice dosed at 10,000 mg kg(-1) with the lyophilized extracts of all the mushrooms screened, with the exception of that of H. aurantiacus, which produced death 21-23 h post administration. This result showed that all the screened mushrooms, including the popular edible M. procera were found toxic. Therefore, since all the mushrooms screened were found toxic, it is recommended that extreme caution should be exercised in their consumption. Furthermore, in view of the regional differences in the toxicity of mushrooms, there is the need to screen more wild mushrooms found in Nigeria for toxicity. This will boost mushroom mycophagy, reduce poisoning incidence and reduce wastage of edible mushrooms in the wild.

An investigation was conducted at the Ahmadu Bello University Veterinary Teaching Hospital (ABUVTH) between January, 1990 and September, 2003 to determine the aetiology and prevalence of canine anaemia in Zaria, Nigeria. Out of the 5278 mongrel dogs presented during the period 1990-2003, 2139 (40.5%) were found to be anaemic, with packed cell volume (PCV) values ranging from 7 to 36%. The clinical signs presented by these dogs include: Pale mucous membranes, weakness, depression, anorexia/inapettence and reduced activity. About 50 dogs (about 1%) with helminths and haemoparasitic infestations had high PCV values (37-40%) without clinical presentation of anaemia or disease. Most of the dogs with anaemia (n = 2016 or 94.2%) had parasitic infestations. About 1580 (about 74%) of the anaemic cases, attributed to parasitic infestations occurred between May and October. A few dogs (n = 55, 2.6%) had anaemia due to poor nutrition, while 68 (3.2%) had anaemia with unknown cause. The public health significance of the parasites reported in this study is discussed.

Six local species of culicides were identified as the common mosquitoes in Zaria, out of 15 species captured using various adult and larval collection methods. These common culicides are Culex pipiens fatigans, Anopheles gambiae grp., Mansonia africana, Culex pipiens pipiens, Aedes (stegomyia) aegypti and Aedes vittatus. They were each fed directly on a local dog naturally infected with Dirofilaria repens to evaluate their refractoriness/susceptibility to dirofilarial infection. In a number of donor-feeding trials, 39. 4% Culex pipiens fatigans; 58.9% An gambiae grp.; 60.5% Mansonia africana; 1.8% of Culex pipiens pipiens; 23.4% Ae aegypti and 3.3% of Ae vittatus successfully fed on the microfilaraemic host. Only Aedes aegypti was susceptible to the infection as all 40 (100%) Ae aegypti reaching 10-14 day post-blood meal had infective (L(3)) larvae of D. repens. The remaining five species were refractory. The microfilariae in the five non-susceptible mosquitoes were always found trapped in the blood meal in the insects midgut (stomach). These trapped microfilaria were dead by the 2nd day in the insect's midgut. However, in the susceptible Ae aegypti, the microfilariae were set free from the blood meal in the midgut and within 24h migrated to the malpighian tubules (MT) of the mosquitoes. All Ae aegypti dissected 5-7 day post-infective blood meal showed the typical quiescent sausage stage (L(2)) larvae in the malpighian tubules. At day-10 post-blood meal, relatively active infective (L(3)) larvae of D. repens were found in the MT; and by day 12-14, highly motile infective larvae had reached the insect's head and proboscis, with infective larvae occasionally oozing out during dissection through the tip of the proboscis. The rate of development of D. repens to infective larvae was faster in mosquitoes infected in July when the environmental temperature was 24.5 degrees C than those infected in November when the temperature was 22.5 degrees C. The latter were delayed for 4 days. The breeding sources of Ae aegypti, the local vector implicated were also identified. As no particular vector of this zoonotic filaria has been identified previously in Nigeria, these findings could make any control programme more focussed and easier.