By sharing information about new interventions, and rigorously evaluating program outcomes, researchers and service providers are working to pool their knowledge and develop effective strategies to improve health and well-being across Ontario’s HIV Prevention, Engagement and Care Cascade.


Prevention services and interventions work with at-risk people and populations. Research in this area aims to understand the conditions and the social drivers of health that put people at risk and to develop services to address those conditions before HIV and Hepatitis C infection occur. Interventions are often targeted to specific populations. Prevention also includes research on biological approaches to HIV avoidance including pre and post exposure prophylaxis and the development of microbicides.


The Public Health Agency of Canada estimates that 21% of people infected with HIV in Ontario remain undiagnosed (range 18-25%). Engagement research explores ways to identify and support these individuals, and to ensure that people living with HIV have access to comprehensive care services that helps them maintain their health and well-being.


Data from the OHTN Cohort Study, suggests that most people diagnosed with HIV in Ontario are receiving antiretroviral treatment (77%) and that over three-quarters of those individuals have suppressed viral load (study findings). Care research focuses on continuous improvement of treatment outcomes in Ontario, and on creating more comprehensive services that address both mental and physical health, that determine and establish care standards for HIV-related comorbidities, and that holistically promote the health and well-being of people living with HIV.

Key Facts and Research Findings

Related Studies

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OHTN Resources

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