Measles returns to Illinois as Pennsylvania records first deaths in 35 years

With Pennsylvania reporting its first measles-related deaths in over three decades amid a surge in cases, Illinois health officials urge residents to verify their vaccination status as outbreaks threaten communities.

Illinois public health leaders are warning families to check their measles protection after Pennsylvania confirmed two measles-associated deaths, the state’s first in 35 years. The Illinois Public Health Association said the deaths are a stark reminder that the virus can still cause severe illness, especially among people who have not been vaccinated.

Pennsylvania’s health department said both people who died were unvaccinated. It also said the measles, mumps and rubella vaccine offers about 97% lifetime protection after two doses. The state has been dealing with a large outbreak this year, with the caseload rising to 497 confirmed infections across 34 counties, according to the latest update from the Pennsylvania Department of Health.

In Illinois, the state health department has recorded five confirmed measles cases in 2026 so far. The Illinois Public Health Association said the timing is especially important as students return to school and families review immunisation records. Even though Illinois reported 96.78% measles vaccination coverage in its most recent school data, the association warned that some counties and schools remain below the 95% level often cited as important for community protection, leaving room for outbreaks to take hold.

Melissa Graven, associate executive director of the Illinois Public Health Association, said adults should also know their vaccination status and not assume they are protected. “Measles is back, and we need to remain vigilant,” she said in the association’s statement. “If you aren’t sure whether you or your family are protected, don’t guess. Talk with your health care provider or local health department.”