May 15, 2025 · Homepage of Public Health Ontario (PHO). PHO keeps Ontarians safe and healthy. With our partners in government, public health and health care, we prevent illness and …

We undertake important tests for Ontario’s public health units, clinicians in primary care, hospitals, and long-term care facilities, as well as conducting reference testing for partner laboratories …

We provide scientific evidence and expert guidance that shapes policies and practices for a healthier Ontario. Our goal is to ensure Ontario has the strongest public health system and …

This tool provides comprehensive epidemiological information of respiratory virus activity in Ontario, including COVID-19, influenza and other respiratory viruses. Explore case trends, …

Learn more about working at PHO, a hub for public health practice, health care, academic research and applied research.

For use by qualified health care providers, these resources provide comprehensive instructions related to laboratory tests performed by Public Health Ontario, including testing indications, …

Information about exposure locations in public settings and what to do if you are exposed to measles.

Dec 1, 2025 · This page provides current data and surveillance information on COVID-19, including COVID-19 activity in Ontario, vaccination, variants and settings. For historical …

For inquiries about public health issues or services in your community, contact your local public health unit. For medical or health information, please contact your local health care provider.

Explore geographical surveillance data on vector-borne diseases in Ontario, including human cases, mosquito, and blacklegged tick established risk areas.