Measles Cases Spread Across US, Mexico and Canada. Learn How to Protect Yourself

While the big measles news in 2025 has focused on the major outbreak in West Texas and New Mexico, the deadly virus has spread much farther than the US Southwest. Illinois, Missouri and North Dakota have all confirmed measles cases in recent days. The outbreak of measles has spread to countries that border the US as well -- Ontario, Canada, has reported a whopping 1,383 cases since its outbreak began, and Chihuahua, Mexico, has reported 713 cases too. According to the CDC, two doses of the MMR (measles, mumps and rubella) vaccine are 97% effective at preventing measles, while one dose is 93% effective. It is uncommon for someone who is fully vaccinated to develop measles, although the first breakthrough case of 2025 was recently detected in Colorado. To learn more about measles symptoms and whether you need to get vaccinated again, we spoke with doctors for their expert insights. What does measles look like in adults and children? Measles is one of the world's most contagious viru ... Read full article.