Overview

• As of Friday, Mexican authorities report more than 4,630 confirmed cases and 21 deaths across 23 states.
• OPS data through mid‑September show 11,313 cases and 23 deaths across the Americas, with Mexico second in cases behind Canada and ahead of the United States but leading in fatalities.
• Mexico’s outbreak is centered in Chihuahua, which has about 4,133 cases, and health reports indicate most national deaths occurred there.
• Low immunization is driving spread, with over 71% of regional cases unvaccinated and Mexico’s surveillance indicating roughly 88% without prior measles vaccination, with the highest incidence in infants.
• OPS calls for achieving at least 95% two‑dose coverage, immediate vaccination of contacts up to age 39, strengthened border surveillance, and vitamin A for cases, while authorities in Mexico City ran a mass vaccination site Sept. 17–19 for people six months to 49 years.