The United States, Canada, and Mexico are facing a significant measles outbreak with over 2,500 cases and four deaths attributed to vaccine hesitancy. The outbreak began in late 2024 in Ontario, Canada, and has spread to Texas and northern Mexico, primarily affecting under-vaccinated Mennonite communities. The measles vaccine is highly effective, providing about 97% protection, and achieving herd immunity is crucial, requiring 95% of the population to be vaccinated to prevent further spread.
