The Centers for Disease Control and Prevention has documented 4,410 measles cases nationwide as of mid-October, marking a significant increase of 330 cases during the preceding week. The outbreak has resulted in 451 hospitalizations across the country. Infection patterns show that children and teenagers aged five to 19 represent 42 percent of reported cases, while adults aged 20 and older account for 41 percent of infections. The remaining 17 percent of cases have been identified among children under age five.
Pennsylvania is experiencing the nation’s most severe outbreak, with 1,222 cases documented across 42 counties as of mid-week. The state has confirmed five measles-associated deaths and is investigating a sixth potential fatality. Additionally, 225 individuals in Pennsylvania have required hospitalization. The state health department reported 86 new infections in the week preceding the reporting date.
In response to the escalating situation, the CDC has deployed an epidemiological specialist from its Epidemic Intelligence Service to assist Pennsylvania state health officials. This deployment came following an official request from state authorities for federal support. Simultaneously, Pennsylvania has intensified vaccination initiatives within affected communities, with state health center personnel administering more than 5,900 doses of measles, mumps and rubella vaccine at 202 temporary vaccination clinics since the outbreak began in late April.
New York Governor Kathy Hochul declared a statewide disaster emergency on October 5 as cases increased in neighboring Pennsylvania. The declaration, which remains in effect through November 4, authorizes additional healthcare professionals to administer vaccines and permits nurses expanded authority to order measles testing.
National vaccination data indicates a concerning downward trend in measles immunization coverage among kindergarteners, which declined from 95.2 percent during the 2019–2020 school year to 92.4 percent in 2025–2026. The CDC estimates this coverage gap places approximately 280,000 kindergarteners at risk.
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