Event Details

PHO Rounds: Is Antibody Out There? Understanding COVID-19 Seroprevalence in Ontario

Serosurveys for Coronavirus Disease 2019 (COVID-19) aim to estimate the proportion of the population that has been infected by and developed antibodies against SARS-CoV-2, the virus that causes COVID-19, at various points in time. In this presentation, we will outline the key findings of the Ontario COVID-19 serosurveys performed by Public Health Ontario (PHO) and discuss the interpretation of our results, as well as the implications of the findings on the pandemic response.

By the end of this session, participants will be able to:

  1. Explain the purpose of seroprevalence studies
  2. Summarize the advantages and drawbacks of various serosurvey methodologies
  3. Describe COVID-19 seroprevalence trends in Ontario over time

Presenter(s): Vanessa Tran and Shelly Bolotin

Vanessa Tran is a Clinical Microbiologist at Public Health Ontario’s laboratory, and an Assistant Professor in the Department of Laboratory Medicine and Pathobiology at the University of Toronto. Her clinical portforlio includes HIV, Hepatitis Viruses, and Education. She is supporting the COVID-19 laboratory response and is the lead for COVID-19 serology testing at PHO.

Shelly Bolotin is a scientist in Health Protection at PHO, and an Assistant Professor at the Dalla Lana School of Public Health and the Department of Laboratory Medicine at the University of Toronto. Her research program focuses on measuring population immunity to vaccine-preventable diseases. She is the COVID-19 serosurveillance lead at PHO.



Public Health Ontario Rounds are a self-approved group learning activity (Section 1) as defined by the Maintenance of Certification Program of the Royal College of Physicians and Surgeons of Canada (RCPSC). In order to receive written documentation for Continuing Medical Education (CME) credits, please check “Yes” beside the question “Do you require CME credits?” on the registration form.

College of Family Physicians of Canada (CFPC) Affiliate Members may count RCPSC credits toward their Mainpro+ credit requirements. All other CFPC members may claim up to 50 Certified credits per cycle for participation in RCPSC MOC Section 1 accredited activities.

PHO Rounds are also approved by the Council of Professional Experience for professional development hours (PDHs) for members of the Canadian Institute of Public Health Inspectors (CIPHI).

For more information or for a record of registration for other Continuing Education purposes, please contact events@oahpp.ca


Public Health Ontario is committed to complying with the Accessibility for Ontarians with Disabilities Act (AODA). If you require accommodations to participate in this event, please contact 647-260-7100 or events@oahpp.ca.

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Published 9 Nov 2020