Archive: Coronavirus Disease 2019 (COVID-19)

This page contains an archived collection of PHO’s previously published COVID-19 resources. These resources provide a point in time perspective of the COVID-19 pandemic in Ontario

This archived content is being made available for historical research and reference purposes only. PHO is no longer updating this content and it may not reflect current data or information. These resources only contain information that was available at the time of publishing.

For current information, please refer to our COVID-19 landing page.

Data and Surveillance

Health Professionals



PHO Rounds: Tuberculosis Contact Investigation: Principles and practice

This PHO Rounds will review the principles of TB contact investigation, including transmission risk assessment, prioritizing follow-up based on the source case’s likely infectiousness, the nature of the exposure(s), and factors that increase immunologic vulnerability of exposed individuals to TB disease.

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Updated 11 Oct 2023