By exposure category 2017

Data source: Public Health Ontario Laboratory HIV Datamart

Key points

  • Go here for exposure category definitions and the hierarchy used to assign a test to a single category. HIV test data are not presented by priority population, as the HIV test requisition form prior to 2018 did not collect race/ethnicity and country of birth, both of which are required to assign tests to specific priority populations. Risk factor information was missing or indicated as “none” for over half of test requisition forms, and therefore an exposure category could not be assigned. These tests were excluded from the below data.
  • Between 2013 and 2017, the majority of HIV tests were consistently among heterosexual males or females who reported partners with no identified risk. However, this proportion decreased over time among males and remained stable among females.
  • Between 2013 and 2017, the percent of HIV tests in males attributed to men who have sex with men (MSM) increased from 23.7% to 30.9%.
  • In 2017, the highest HIV positivity rate in males was among MSM who used injection drugs (3.5%), whereas in females it was among individuals from countries identified as HIV-endemic (1.1%).

 

Figures

Figure 1 Percent of HIV tests by exposure category (where known), Ontario, 2013 to 2017

Snapshot: Between 2013 and 2017, the percent of HIV tests attributed to the MSM exposure category increased from 12.6% to 16.9%. The majority of tests were consistently among heterosexual people reporting partners with no identified risk factors, however this percent decreased over time.


Figure 2 Percent of HIV tests by exposure category (where known), males, Ontario, 2013 to 2017

Snapshot: Between 2013 and 2017, the percent of HIV tests among males attributed to the MSM exposure category increased from 23.7% to 30.9%. The majority of tests were consistently among heterosexual males reporting partners with no identified risk, however this percent decreased over time.


Figure 3 Percent of HIV tests by exposure category (where known), females, Ontario, 2013 to 2017

Snapshot: Between 2013 and 2017, the percent of HIV tests remained stable within exposure categories. The majority of HIV tests among females were consistently among heterosexual females reporting partners with no identified risk factors.


Figure 4 HIV test positivity rate by sex and exposure category (where known), Ontario, 2017

Snapshot: In 2017, the HIV test positivity rate among males was highest for MSM-PWID, while the rate among females was highest for people from HIV-endemic countries. Test positivity rates could be affected by re-testing of people who already know their status. This may explain the higher test positivity for people with endemic exposures.

Tables

Table 1 Number of HIV tests by exposure category, Ontario, 2013 to 2017

 

Table 2 Percent of HIV tests by exposure category, Ontario, 2013 to 2017

 

Table 3 Number of HIV tests by exposure category, males, Ontario, 2013 to 2017

 

Table 4 Percent of HIV tests by exposure category, males, Ontario, 2013 to 2017

 

Table 5 Number of HIV tests by exposure category, females, Ontario, 2013 to 2017

 

Table 6 Percent of HIV tests by exposure category, females, Ontario, 2013 to 2017

 

Table 7 Number of HIV tests and test positivity rate by exposure category, males, Ontario, 2017

 

Table 8 Number of HIV tests and test positivity rate by exposure category, females, Ontario, 2017

 

Notes: Data provided by Public Health Ontario Laboratory. Excludes HIV-negative prenatal tests. Positive results and positivity rate includes those being diagnosed for the first time in Ontario after being diagnosed previously elsewhere (known to be HIV-positive at the time of testing). MSM=men who have sex with men. PWID=people who use injection drugs. PIR=partner with identified risk. NIR=partner with no identified risk. Unknown=exposure category missing or marked as “no identified risk”. Other includes transmissions via clotting factor, transfusions, or mother-to-child.