CDC Sends Disease Detective to Pennsylvania as US Measles Cases Climb 330 in a Week, With Federal and State Death Counts Still Apart

Since Pennsylvania's outbreak pushed the national count past last year's total, the federal response has taken a concrete step: the CDC is sending one of its "disease detectives" from the Epidemic Intelligence Service to work with state health officials. Pennsylvania requested the help through a federal mechanism known as an Epi-Aid.

The national tally now stands at 4,410 confirmed cases as of Oct. 15, up 330 from 4,080 a week earlier. That is an 8% jump in seven days. The CDC counts 42 outbreaks this year, and 96% of cases (4,228 of 4,410) are outbreak-associated.

Pennsylvania: the epicenter

The state health department reported 1,222 confirmed cases across 42 counties as of Oct. 14. That includes 86 new infections since Oct. 9. There have been 225 hospitalizations.

Pennsylvania has confirmed five measles-associated deaths, including two infants, an 18-year-old and a 40-year-old woman. A sixth, in Franklin County, is under state review and not yet in the count.

The Franklin County coroner, James Conner, announced that death on a Facebook statement. The victim was a 39-year-old unvaccinated woman with several underlying conditions, including a past measles diagnosis. A coroner's office spokesperson said the primary cause was "a probable acute cardiac event due to possible complications of the measles." The state health department said it is "conducting a thorough review."

State health staff have given more than 5,900 MMR doses at 202 pop-up clinics. Only four of Pennsylvania's confirmed cases involved vaccinated people, under 1% of the total. State officials say two doses of MMR are 97% effective against measles.

Two death counts, one disease

The CDC still acknowledges two measles deaths nationally this year. Pennsylvania says five, with a sixth pending. The gap reflects a dispute between HHS Secretary Robert F. Kennedy Jr. and Pennsylvania Gov. Josh Shapiro over how measles-related deaths are classified.

The CDC says it is working with the Council of State and Territorial Epidemiologists to build a standardized case definition for measles deaths. A CSTE spokesperson told CIDRAP the work should take two to three months. Until then, federal and state numbers can keep diverging.

Kennedy told Spectrum News 1 this week that he will bring the Pennsylvania outbreak "to a quick close."

Pennsylvania's death toll also looks heavy against its case count. Historic measles mortality runs one to three deaths per 1,000 infections. Infectious disease specialists told CIDRAP that, on those rates, the state's real infection count could be 6,000 or more. Milder cases may go unreported, especially in Amish and Mennonite communities where parents often treat sick children at home instead of going to a doctor who would report to the health department.

"Our detection of disease is only as good as our reporting," said Dr. Robert Hopkins, medical director of the National Foundation for Infectious Diseases.

Other states and the national picture

Kentucky added 66 cases this week and has 170 for the year. A CDC map as of Oct. 1 showed Pennsylvania with 963 cases, South Carolina with 670 and Utah with 535. Dr. Amesh Adalja of the Johns Hopkins Center for Health Security is also watching Ohio, southwestern Wisconsin and Utah.

New York Gov. Kathy Hochul declared a statewide disaster emergency on Oct. 5. The order runs through Nov. 4. It widens the pool of professionals who can give vaccines and gives nurses more flexibility to order measles tests.

By age, 42% of national cases are in people aged 5 to 19, 41% in adults 20 and older, and 17% in children under 5. There have been 451 measles hospitalizations nationwide.

CDC data show kindergarten MMR coverage fell from 95.2% in 2019-2020 to 92.4% in 2025-2026. The agency estimates about 280,000 kindergarteners are at risk because of those gaps.

What the experts project

Adalja predicts the U.S. will finish 2026 with roughly 6,000 to 6,500 confirmed cases. Dr. William Schaffner of Vanderbilt University Medical Center called that "a reasonable order of magnitude."

"The virus hasn't changed, and neither has the vaccine," Adalja told Newsweek. "Our willingness to use it has."

Dr. Peter Hotez of Baylor College of Medicine said the worst may still be ahead. Measles surges have come in late winter and early spring in both 2025 and 2026, he said, so he expects the peak in February and March. "We have too many unvaccinated kids and adults," Hotez said.

It is not yet known whether the CDC's new definition will absorb Pennsylvania's disputed deaths. That answer is not due until roughly December or January, at the front edge of the season Hotez is worried about.