What’s the state of influenza spread in Canada? How bad is RSV and COVID?
The Canadian respiratory virus surveillance report tracks how prevalent certain viruses are each week and how the trends are changing week to week.
The latest data, which covers the week ending March 8, 2025, shows RSV and COVID-19 infections continuing to drop across Canada, with influenza rates dropping after reaching a high of 27.7% in February.
Influenza rates were undergoing a sharp upward trend since the beginning of January when it was just above 11%.
Virus spread is measured by looking at the percentage of tests for each virus that come back positive.
The charts below compare positivity rates for this season — which began at the end of August — with the previous two years.
