September 10, 2026 | Pennsylvania, USA

A growing measles outbreak in Pennsylvania has now resulted in more than 620 reported cases across 37 counties, as health officials continue responding to one of the state’s most significant measles outbreaks in years.

Officials Release New Details

The Lancaster County coroner has released additional information concerning two infants who died last month and had measles infections.

One was a six-week-old infant who died from a measles infection while also having a serious genetic condition.

A second newborn died from a ruptured spleen, with measles listed as a contributing condition rather than the primary cause of death.

Neither Infant Was Old Enough for Routine Vaccination

Neither infant was eligible to receive the routine measles vaccine because of their young age.

The MMR vaccine, which protects against measles, mumps and rubella, is normally first administered to children between 12 and 15 months of age.

The circumstances have drawn additional attention to the importance of community vaccination because very young babies cannot yet receive routine protection themselves.

More Than 620 Cases Reported

Pennsylvania has reported more than 620 measles cases in 37 counties during 2026, according to reporting by the Associated Press.

The outbreak comes amid broader concerns about declining vaccination rates and the return of a disease that had previously been declared eliminated from continuous domestic transmission in the United States.

International health officials are also preparing to review whether the United States and Mexico continue to meet the criteria for measles-elimination status.

Health authorities continue to encourage vaccination for eligible people as officials work to contain further transmission.

Source: Associated Press — September 10, 2026.