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North America's three largest measles outbreaks continue to expand, with over 2,500 confirmed cases.

2025 Southwest United States measles outbreak — North America's three largest measles outbreaks continue to expand, with over 2,500 confirmed cases. There have been three fatalities in the United States and one in Mexico. The ou

Published May 1, 2025· Updated October 28, 2026·1 min read

Context: 2025 Southwest United States measles outbreak.

North America's three largest measles outbreaks continue to expand, with over 2,500 confirmed cases. There have been three fatalities in the United States and one in Mexico. The outbreaks began in Ontario, Canada, then surged in Texas and New Mexico, and have quickly escalated in Chihuahua, Mexico. [https://apnews.com/article/measles-texas-mexico-canada-ontario-0956a30c043b030ae79bc9f67c6ce89c (AP News)]

Event summary via Wikipedia Current Events (2025-05-01).