In Mexico, according to the distribution of probable and confirmed measles cases by epidemiological week (EW), based on the date of rash onset, the first confirmed case of measles was reported in EW 5; in EW 29, 318 probable cases and 135 confirmed cases have been reported; to date, 85 probable cases and 6 confirmed cases have been reported.
As of July 25, 3,730 confirmed cases of measles have been reported; 86 cases were reported in the last 24 hours. Sonora follows with 84 confirmed cases.
More than 7,000 probable cases have been reported nationally.
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Based on the distribution of confirmed measles cases by state and municipality, 20 states and 82 municipalities have confirmed measles cases.
According to health officials, Chihuahua accounting for 3,490 cases—93% of the national total. Tragically, 12 deaths have been reported, mostly among children under five.
Confirmed measles cases affect both sexes (48% men and 52% women). Regarding the number of cases, the most affected age group is 0 to 4 years of age (838 cases), followed by 25 to 29 years of age with 512 cases and 30 to 34 years of age with 419 cases.
Regarding the incidence rate, the 0 to 4 age group reported the highest incidence rate (8.05 cases per 100,000 inhabitants under 4 years of age), followed by the 25 to 29 age group and the 30 to 34 age group with incidence rates of 4.83 and 4.01, respectively.
In response to the outbreak, authorities launched the "Rapid Response Plan for the Measles Outbreak", focusing on enhanced surveillance, faster lab diagnostics, and strict case isolation. The "Juarez Shield Strategy", targeting residents aged six months to 49 years, has already vaccinated about 42,000 people in Chihuahua.
Health officials warn that the real number of cases could be higher due to under-reporting. Most victims were unvaccinated, reflecting a drop in national vaccine coverage to around 76%—far below the 95% threshold needed for herd immunity.