Rise in Stomach Illness Cases Reported in Southeastern Ontario

A hospital sign is seen at a facility in southwestern Ontario on May 22, 2025. The Canadian Press/Nicole Osborne

Cases of infectious gastrointestinal illness are increasing in southeastern Ontario, with norovirus accounting for most infections, local public health officials say.

Ontario’s Southeast Public Health said in a May 4 news release that stomach illnesses are on the rise in the Kingston area and are highly contagious. The agency is advising residents to take precautions to limit further spread.