Circulation of respiratory viruses is normally highest in the fall and winter. For the purposes of reporting and comparisons over time and between viruses, the respiratory season typically runs from late August of the current year to late August of the following year. The current season, 2023-2024, starts on August 27, 2023 and ends on August 24, 2024. Additional information on respiratory season, and a full calendar for the current season, can be found on the Data Notes page.
Respiratory virus data included in the interactive data application is up-to-date as November 25, 2023. Among its new features, the dashboard now includes RSV cases and positivity, with plans to collect Severe Outcomes data in the near future.
Number of respiratory virus outbreaks by week, 2019-2020 to 2023-2024
Total respiratory virus outbreaks by outbreak setting, 2023-2024
Total respiratory virus outbreaks by zone, 2023-2024
Multiple organisms can be detected in an outbreak so the totals may not add up to the total number of outbreaks in each zone and facility.