HIV diagnoses and testing patterns among young gay, bisexual and other men who have sex with men: an analysis of HIV surveillance data in British Columbia, 2008-2015.

Abstract

We examined changes in HIV testing indicators following a recent increase in diagnoses among young gay, bisexual and other men who have sex with men (GBMSM) in BC that accompanied implementation of a provincial HIV strategy. Surveillance and laboratory testing data were used to compare case counts and testing characteristics among GBMSM < 30 and ≥ 30years diagnosed in 2008-2011 and 2012-2015. We tested differences in the proportion diagnosed on first testing episode, proportion diagnosed at late stage of infection and the median inter-test interval ((ITI) time in months between last negative test and first positive test) using χ2 and Wilcoxon rank-sum tests. In 2008-2011, 657 diagnoses were made among GBMSM: 24% among men < 30years and 76% among men ≥ 30years. In 2012-2015, 590 diagnoses were made: 28% among < 30years and 28% among ≥ 30years. Among men < 30years, diagnoses made on first testing episode decreased (39.4% vs. 28.7% in 2012-2015; p = 0.042) and there were few late-stage diagnoses (5.1% in 2008-2011 vs. 9.1% in 2012-2015). The median ITI was 10months in both periods. No changes were observed over time among men ≥ 30years. However, in both periods, late-stage diagnosis was more common in men ≥ 30years (2008-2011, 18.8%; 2012-2015, 18.6%; p < 0.01 for both). The ITI was also longer for men ≥ 30years (2008-2011, 24.5months; 2012-2015, 20months; p < 0.001 for both). Testing indicators suggested better testing practices among GBMSM diagnosed at < 30years compared to those diagnosed at older ages. However, there are clear needs for additional prevention measures in both age groups.