Quebec says measles outbreak has ended

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Montreal·New

Quebec's outbreak began in December 2024 and involved a contagious traveller who had visited the province before they were diagnosed.

An outbreak can be considered over if 32 days pass with no new reported case

The Canadian Press

· Posted: Apr 22, 2025 12:55 PM EDT | Last Updated: 15 minutes ago

A digitally colourized transmission electron micrographic of the reveals some of the ultrastructural morphology exhibited by both a paramyxovirus measles virus (MeV), and virions of the polyomavirus, simian virus SV40.

This digitally colourized transmission electron micrographic (TEM) image shows the measles virus. (Dr. Erskine Palmer/CDC)

Quebec's Health Ministry has declared an end to the measles outbreak in the province.

A spokesperson said Tuesday the department determined the outbreak was over after no new cases were reported over the weekend.

Marie-Christine Patry says an outbreak can be considered over if 32 days pass without a new reported infection.

Quebec's outbreak began in December 2024 and involved a contagious traveller who had visited the province before they were diagnosed.

Most of the province's cases — 32 out of 40 — were reported in the Laurentians region, north of Montreal.

The federal government says there have been 880 measles cases reported in five provinces so far in 2025, with the vast majority — 804 — in Ontario.

Patry says there hasn't been a new case of measles reported in Quebec since March 18.

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