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Measles is highly contagious, but vaccine-preventable: A primer on recent outbreaks, transmission, symptoms and complications, including ‘immune amnesia’

Canada is seeing a resurgence of measles, with cases in the first quarter of 2024 already far surpassing the total for all of 2023. There were 12 cases last year, and more than three times that number so far in 2024, with 38 reported as of March 19.

Most of these cases (28) are in Québec, and eight are in Ontario, while Saskatchewan and British Columbia have each reported one case.

As an immunologist with a focus on host-microbe interactions and antiviral immunity, I have been following recent measles outbreaks.