Ontario sees another sharp rise in measles cases while outbreaks grow in Quebec, Alberta

By Canadian Press on March 20, 2025.

There’s been another sharp increase in Ontario measles cases as the province begins to release weekly reports on the infectious disease.

Public Health Ontario is reporting 470 measles cases since an outbreak began in October. That’s an increase of 120 cases since March 14.

The spread resulted in 34 hospitalizations, including two people who needed intensive care. Most of those hospitalized were unvaccinated kids, including one of the intensive care patients.

The majority of cases are still located in the Southwestern Public Health region, where almost half of the cases are reported, and neighbouring Grand Erie, which has almost 24 per cent.

The outbreak expansion adds to the growing concern of rising measles cases in different parts of the country, including in Quebec where there are 40 cases and Alberta where there are 13, according to the latest data.

Ontario has increased its reporting of measles cases from publishing case numbers on a biweekly to weekly basis while Alberta has started releasing data daily from Monday to Friday.

Symptoms of the highly contagious respiratory virus include fever, a red blotchy rash, red watery eyes and cough.

This report by The Canadian Press was first published March 20, 2025.

Canadian Press health coverage receives support through a partnership with the Canadian Medical Association. CP is solely responsible for this content.

Hannah Alberga, The Canadian Press