Since October 2024, Ontario has identified 2,009 measles cases as of June 1, 2025
Typically, Ontario has 0 to 22 cases a year.
This is by far the largest measles outbreak we have seen in almost 30 years.
… and many cases have been in people who are not vaccinated for measles.

Click Here to check out our Measles Fact Sheet to get the overview of measles infection, signs & simptoms, and key facts to consider getting vaccinated with measles vaccines.