Methods to estimate the number of people living with undiagnosed HIV


Key take-home messages
  • At the end of 2016, the Public Health Agency of Canada estimated that 14% of 63,110 individuals living with HIV in Canada were undiagnosed.
  • Different types of data can be used across a variety of methodologies to estimate the undiagnosed proportion of people living with HIV.
  • The proportion of individuals living with HIV in Canada who were undiagnosed in 2016 was estimated using a complex statistical method known as “back-calculating”, which requires reliable data on HIV diagnoses and deaths from previous years.
  • Of the 21% of people living with HIV in Canada in 2014 who were undiagnosed, approximately 18% were attributed to the men who have sex with men exposure category, 20% to injection drug use, and 28% to heterosexual contact.


The Ontario HIV Treatment Network: Rapid Response Service




  • Epidemiology and Determinants of Health
    • Epidemiology
  • Population(s)
    • General HIV+ population
  • Testing
    • Testing


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