HIV epidemiology update for gay, bisexual, and other men who have sex

What percentage of people diagnosed with HIV for the first time in Ontario are GBMSM? From 2010 to 2019, between 62% and 67% of people diagnosed with HIV for the first time were GBMSM, depending on the year 62-67% (among those where HIV exposure category known)2,3,5. [...] What age group of GBMSM has the highest rate of first-time HIV diagnoses in Ontario in 2019? 13.5 14.6 In 2019, GBMSM aged 25-34 were diagnosed with HIV for the first time at the highest 6.8 rates per 100,000 males 2,5,7,8. [...] Counts of GBMSM diagnosed with HIV are estimated by applying the proportion of diagnoses attributed to GBMSM among males where GBMSM status is known to the diagnoses among males where GBMSM status is unknown. [...] 307 diagnoses known to be GBMSM plus the 84 diagnoses estimated to be GBMSM from those with unknown GBMSM status equals the 391 total estimated GBMSM diagnosed with HIV for the first time in 2019, as reported in this factsheet. [...] GBMSM status was unknown for an average of 17.6% of first-time HIV diagnoses among males per year between 2010 and 2019, and for 21.6% of first-time HIV diagnoses among males in 2019.