Ontario Respiratory Virus Tool

This tool provides comprehensive epidemiological information on respiratory virus activity in Ontario.

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We are an interdisciplinary scientific and research organization with province-wide reach, that is committed to advancing public health evidence and knowledge. Our unique approach features applied public health research programs and is guided by public health needs. 

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Updated 15 May 2025

Epidemiological Summary

Epidemiology of measles cases in Ontario with a focus on the current outbreak.

608 KB
Updated 11 Dec 2025

Epidemiological Summary

This report summarizes iGAS activity in Ontario compared to trends from three post-pandemic seasons (2022 – 2025) and five pre-pandemic seasons (2014 – 2019).

1.9 MB
Updated 11 Dec 2025

Surveillance Report

Epidemiological summary of legionellosis activity in Ontario displaying trends over time, by sex and age group, and by public health unit; number of patients tested and percent positivity; and severity indicators.

1.1 MB
Updated 4 Dec 2025

Best Practice

This document provides guidance for risk factor-based screening and IPAC management of cases of human-to-human transmissible VHF.

845 KB
Updated 14 Nov 2025

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