Ontario Respiratory Pathogen Bulletin

PHO monitors and analyzes the spread and intensity of respiratory pathogen activity and influenza in Ontario to support local, provincial, federal and global surveillance efforts.

The Ontario Respiratory Pathogen Bulletin (ORPB) is a comprehensive, weekly summary of provincial respiratory pathogen activity. Including information on the onset, duration, conclusion, geographic patterns, severity and progression of seasonal influenza activity.

The Ontario Respiratory Pathogen Bulletin does not contain COVID-19 specific data. PHO’s most recent reports, data analyses, and data tool for COVID-19 can be accessed at PHO’s COVID-19 Data and Surveillance page.

Information for Health Care Providers

Healthcare worker influenza immunization coverage rate data for the 2021-22 season can be found here.

Influenza antiviral medications are recommended for treatment of some individuals when influenza is circulating in your community (See map tab).

See our at a glance document for more information (September 2021) on the use of antiviral medications for the treatment and prevention of influenza.

For information on influenza vaccines for the 2021-22 influenza season, please see our Focus On document.

The ORPB is posted every Friday at 11:30 a.m. EST

For past reports, visit our Historical Bulletin page.

To see information on source data, classifications, citations, definitions and more, see our Technical Notes.

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Communicable Diseases


Updated 11 Nov 2022