CDC Reports 4,588 Measles Cases as Pennsylvania Death Count Disputes Federal Data

The Centers for Disease Control and Prevention reported that measles cases in the United States have reached 4,588 in 2026, an increase of 178 cases from the previous week. This total is more than double the number recorded in 2025, according to data released on Friday. The disease is currently active in at least 43 separate outbreaks across the country.

Pennsylvania accounts for 1,338 of those cases, making it the state with the highest number of infections. South Carolina and Utah are the only other states reporting more than 500 cases each. Despite these high numbers, medical experts describe the official tally as an undercount. Measles is one of the most contagious diseases known to medicine, and symptoms such as fever, cough, and rash often lead infected individuals to delay seeking medical care.

A discrepancy exists between state and federal records regarding deaths. Pennsylvania state authorities have confirmed five measles-related deaths and are investigating a sixth. The CDC has reported only three national deaths. Federal officials have not specified the location of the third death, leaving it unclear if that case occurred in Pennsylvania. Reuters reported that Health and Human Services Secretary Robert F. Kennedy Jr. asked senior CDC officials in September to remove one measles death from the official count after questioning if the disease contributed to the fatal outcome.

The conflict over data coincides with structural changes in federal health oversight. This week, the Health and Human Services department announced updates to the vaccine adverse event reporting system, or VAERS. The proposal allows doctors to bill for reporting suspected vaccine injuries. VAERS has long been a point of contention, with researchers using it to track safety issues and anti-vaccine activists citing it to make claims about vaccine risks.

Kennedy has taken several steps to alter how vaccines are evaluated and presented to the public. He fired all 17 members of the expert panel that previously reviewed vaccine changes and replaced them with individuals aligned with his views, a move a court blocked in March. During his tenure, he has claimed that children receive over 90 vaccine doses and that the measles, mumps, and rubella vaccine contains aborted fetal debris. He also directed the CDC to remove statements from its website asserting that vaccines do not cause autism, a claim that contradicts extensive scientific evidence.

The CDC data indicates that measles remains a serious threat to unvaccinated populations. The disease sends one in five unvaccinated infected individuals to the hospital. Between one and three people in 1,000 die from complications associated with the illness. The measles vaccine is 97% effective at preventing the disease, with common side effects including soreness at the injection site and low-grade fever.