HIV Incidence and Predictors of Incident HIV among Men Who Have Sex with Men Attending a Sexual Health Clinic in Melbourne, Australia

• Published in: PloS one 2016-05, Vol.11 (5), p.e0156160-e0156160
• Main Authors: Cheung, King T, Fairley, Christopher K, Read, Tim R H, Denham, Ian, Fehler, Glenda, Bradshaw, Catriona S, Chen, Marcus Y, Chow, Eric P F
• Format: Article
• Language: English
• Subjects: Adult; Australia - epidemiology; Biology and Life Sciences; Chlamydia; Chlamydia Infections - epidemiology; Condoms; Demographics; Diagnosis; Drug Users - statistics & numerical data; Enzymes; Exposure; Gonorrhea; Gonorrhea - epidemiology; Health risk assessment; Health risks; Health sciences; HIV; HIV infections; HIV Infections - epidemiology; HIV tests; Homosexuality, Male; Human immunodeficiency virus; Humans; Immunoassay; Incidence; Infections; Male; Medical diagnosis; Medical tests; Medicine; Medicine and health sciences; Men; Methods; Middle Aged; Nursing; People and Places; Post-Exposure Prophylaxis - statistics & numerical data; Pre-Exposure Prophylaxis - statistics & numerical data; Prevention; Prophylaxis; Rectal Diseases - epidemiology; Rectum; Retrospective Studies; Risk analysis; Risk factors; Sex; Sexual Behavior; Sexual health; Sexually transmitted disease prevention; Sexually transmitted diseases; STD; Subgroups; Syphilis; Transgender persons; Young Adult
• ISSN: 1932-6203; 1932-6203
• DOI: 10.1371/journal.pone.0156160

The aim of this study was to determine the risk factors for HIV infection and the incidence in men who have sex with men (MSM). It is important to identify subgroups of MSM in which preventive interventions such as pre-exposure prophylaxis (PrEP) offered at the time of their last negative test would be considered cost-effective. We conducted a retrospective cohort study of MSM attending Melbourne Sexual Health Centre (MSHC) during 2007-2013 with at least two HIV tests within 12 months of each other. Demographic characteristics, sexual and other behaviours, and bacterial sexually transmitted infection (STI) diagnoses were extracted from the date of the last negative HIV test. HIV incidence rate (IR) per 100 person-years for each risk factor was calculated. Of the 13907 MSM who attended MSHC, 5256 MSM had at least two HIV tests and were eligible, contributing 6391 person-years follow-up. 81 new HIV diagnoses were identified within 12 months of an HIV negative test with an incidence of 1.3 (95% CI: 1.0-1.6) per 100 person-years. Significant associations with subsequent HIV infection were: rectal gonorrhea (HIV IR: 3.4 95% CI: 2.1-5.2), rectal chlamydia (HIV IR: 2.6 95% CI: 1.7-3.7), inconsistent condom use (HIV IR: 2.1 95% CI: 1.6-2.7), use of post-exposure prophylaxis (HIV IR: 2.3 95% CI: 1.7-3.1), and injecting drug use (HIV IR: 8.5 95% CI: 3.4-17.5). The incidence of HIV was above 2.0% in subgroups of MSM with specific characteristics at the last HIV negative test. PrEP is considered cost effective at this incidence and could potentially be used along with other preventive interventions for these individuals in more than half of the population.