PHAC says norovirus spreading at higher frequency than expected

Specifically, PHAC noted an increase in Ont., Alta. and, to a lesser extent, B.C., Sask., Man., N.B. and N.L. The health agency acknowledged the five-year historical average the current uptick is based on includes several years of the pandemic, a time of reduced norovirus reports. Norovirus is the most common form of the stomach flu, accounting for more than 60% of cases.