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Measles Outbreaks Escalate: Jalisco Confirms 122 Cases as UtahArizona Cluster Spreads

Lagging vaccination in affected communities is fueling community transmission beyond initial school exposures.

Overview

  • Jalisco reports 122 confirmed infections as of the Oct. 23 cut, with most cases in children ages 5–9 and 95.1% lacking complete vaccination.
  • Education officials in Jalisco count 11 schools with suspended activities, including a full closure at a private school in Tlaquepaque and targeted virtual classes in Arandas and Tepatitlán.
  • Mexico has recorded 5,029 measles cases and 23 deaths so far in 2025, according to recent reports, as state brigades expand on-campus vaccination and school-based prevention.
  • Michoacán reaches 100 confirmed cases with roughly 30% test positivity reported by InDRE, concentrated in young children and prompting intensified vaccinations in Yurécuaro.
  • The UtahArizona outbreak stands at 123 cases with confirmed community spread into Hurricane and St. George, six hospitalizations reported, county coverage rates well below 95%, and the CDC tallying 1,618 U.S. cases across 42 states.