Ontario declares measles outbreak over after nearly a year of spread

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Ontario declares measles outbreak over after nearly a year of spread – CBC

by tmnationtalk on October 10, 202530 Views

Outbreak sickened more than 2,300 people in province over the course of nearly a year

Oct 09, 2025

Ontario’s measles outbreak, which sickened more than 2,300 people over the course of nearly a year, highlighted the consequences of declining vaccination rates and led to the death of a newborn, has been declared over.

Public Health Ontario and the province’s top doctor said Thursday the outbreak ended on Monday because it had been 46 days since any new reported cases — twice the maximum incubation period for measles.

“In Ontario, the last confirmed case developed a rash on August 21, 2025, following several months of steadily declining case numbers,” Dr. Kieran Moore, the province’s chief medical officer of health, said in an emailed statement.

“We have now surpassed the required threshold with no additional cases identified.”