Measles outbreak that contributed to Canada losing elimination status highlights risks from persistent immunity gaps

AI Summary

A study in The BMJ links the measles outbreak that contributed to Canada losing its elimination status in November 2025 to persistent vaccination gaps in historically undervaccinated communities. Close social networks spanning Canada, the United States, Mexico, and beyond enabled cross-border transmission.

The outbreak that contributed to Canada losing its measles elimination status in November 2025 was concentrated in historically undervaccinated communities with close social networks across Canada, the U.S., Mexico and beyond, creating opportunities for cross-border transmission, concludes a study published by The BMJ.