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Respiratory Diseases

Respiratory diseases are caused by organisms such as viruses or bacteria that affect the respiratory system (e.g., lungs and throat). The organisms can be spread by coughing, sneezing or face-to-face contact.

We provide public health workers with expertise, support and resources for the prevention and control of infectious respiratory diseases.

Tools

The Ontario Respiratory Virus Tool

This tool provides comprehensive epidemiological information of respiratory virus activity in Ontario, including COVID-19, influenza and other respiratory viruses.
PHO has updated the tool.

Featured

Surveillance Report

Early season genomic surveillance of influenza in 2025-26 describes subclades of H1N1pdm09 and H3N2 circulating in Ontario.

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Updated 16 Dec 2025

Infographic

This infographic summarizes the key findings of the 2024-25 Infant and High-risk RSV Prevention Program process evaluation survey completed by Public Health Units.

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Updated 2 Dec 2025

Interactive Report

Provides comprehensive epidemiological information of respiratory virus activity in Ontario, including COVID-19, influenza and other respiratory viruses. Explore case/episode trends, laboratory testing, outcomes, outbreaks and projections.

Webpage
Updated 11 Sep 2026

Resources on respiratory diseases: infections in the respiratory system that are caused by organisms such as viruses or bacteria.

Webpage
Updated 11 Sep 2026

Epidemiological Summary

This report describes the epidemiology of tuberculosis (TB) in Ontario, presenting data on active TB disease and latent TB infection, including incidence by sex, age group, and geography.

Webpage
Updated 21 July 2026

Surveillance Report

End of season genomic surveillance of influenza in 2024/25 describes subclades of H1N1pdm09, H3N2, and influenza B circulating in Ontario.

703 KB
Updated 29 Aug 2025

Find Information On...

Blastomycosis

Enterovirus D68

Group B Streptococcal Diseases, Neonatal

Invasive Group A Streptococcus

Influenza (flu)

Legionellosis

Leprosy

Middle East Respiratory Syndrome Coronavirus

Nontuberculous Mycobacteria Infections

Coronavirus Disease 2019 (COVID-19)

Respiratory Syncytial Virus (RSV)

Tuberculosis

2026–27 Respiratory Season Resources

Avian Influenza
Updated 11 Sep 2026
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