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Background: Serology is negative in a proportion of primary syphilis cases where Treponema pallidum PCR testing is positive. We aimed to identify discordant, T. pallidum PCR-positive, serology-negative primary syphilis cases and any clinical or laboratory factors associated with failure to subsequently seroconvert.Methods: Serodiscordant primary syphilis cases that were T. pallidum PCR-positive and serology-negative (including rapid plasma reagin, T. pallidum particle agglutination, T. pallidum enzyme immunoassay or T. pallidum chemiluminescence assay) were identified from the Melbourne Sexual Health Centre electronic records between April 2011 and December 2019. Clinical and laboratory associations were examined.Results: There were 814 primary syphilis cases in the study period and 38 (4.7%) were serodiscordant, 35 in men who have sex with men. Thirty-two had follow-up serology performed a median of 24 days later, of which 16 (50%) seroconverted, mostly (81%) within 6 weeks. Failure to seroconvert was significantly associated with treatment on day 1. Of the 12 cases treated on day 1, 10 (83%) failed to seroconvert compared with 6 of 20 (30%) among those who were treated after day 1.Discussion: Earlier treatment of primary syphilis can prevent the development of serological markers. T. pallidum PCR can identify primary syphilis lesions before the development of serological markers and improve diagnosis of early primary syphilis lesions. Serology alone will miss a proportion of primary syphilis infections and should be repeated if a diagnosis of syphilis is being considered. [ABSTRACT FROM AUTHOR]

Background: Syphilis infections continue to increase among men who have sex with men (MSM) in many countries, with rates often higher among HIV-positive MSM. There is limited understanding of the risk and determinants of syphilis transmission between men. We aimed to examine the concordance of early syphilis infection between male sexual partners and clinical factors associated with transmission.Methods: Men attending Melbourne Sexual Health Centre with their male partners, where at least one was diagnosed with early syphilis, were identified from linkage of partner records between March 2011 and April 2016. Early latent syphilis was defined as a new asymptomatic syphilis presentation of less than 2 years' duration. Associations between concordance and potential risk factors were examined using Fisher's exact test.Results: Among 43 couples (86 men) identified, there were 13 couples (26 men) where both were diagnosed with early syphilis, representing a concordance rate of 30.2% (95% CI 17.2% to 46.1%). Among the 13 concordant couples, 5 men had primary syphilis (4 penile, 1 anal), 11 secondary syphilis (8 generalised rash, 3 penile, 2 anal, 1 oral lesion) and 10 early latent infections. Concordance was higher among couples where at least one partner had secondary syphilis compared with couples where neither partner had secondary syphilis (53% (9/17) vs 15% (4/26), P=0.016). Furthermore, concordance was higher among couples where one was HIV positive compared with couples where both were HIV negative (62% (5/8) vs 23% (8/35), P=0.042).Conclusions: There was an overall concordance rate of 30%. Higher concordance rates for early syphilis infection between male sexual partners were associated with HIV and secondary syphilis. [ABSTRACT FROM AUTHOR]

Unlabelled: Background Increasing the frequency of HIV testing in men who have sex with men (MSM) will reduce the incidence of HIV. Trends in HIV testing among MSM in Melbourne, Australia over the last 11 years have been investigated.Methods: A retrospective study was conducted using electronic medical records of the first presentation of MSM who attended the Melbourne Sexual Health Centre between 2003 and 2013. Factors associated with HIV testing (year, demographic characteristics and sexual practices) were examined in multivariable logistic regression analyses. Jonckheere-Terpstra tests were used to examine the significance of trends in the mean time since the last HIV test.Results: Of 17578 MSM seen; 13489 attended for the first time during the study period. The proportion of first attendances who had previously tested and reported a HIV test in the last 12 months increased from 43.6% in 2003 to 56.9% in 2013 (adjusted ptrend=0.030), with a corresponding decrease in median time since the last HIV test from 19 months [interquartile range (IQR) 6-42] in 2003 to 10 months (IQR4-24) in 2013 (ptrend <0.001). The proportion of high-risk MSM (who reported unprotected anal intercourse and/or >20 partners in 12 months) who reported an HIV test in the last 12 months was unchanged (ptrend = 0.242).Conclusions: Despite HIV testing becoming more frequent, the magnitude of change over the last decade is insufficient to substantially reduce HIV incidence. A paradigm shift is required to remove barriers to testing through strategies such as point-of-care rapid testing or access to testing without seeing a clinician. [ABSTRACT FROM AUTHOR]