Two unvaccinated people die of measles in Pennsylvania as US cases reach highest level since elimination

Pennsylvania reported the first two measles deaths in the United States in 2026 on 25 August. Both individuals were unvaccinated. State health officials confirmed the fatalities while Maryland declared a measles outbreak in three counties after recording 14 new confirmed cases.

The Pennsylvania deaths occurred among residents who had not received the measles-mumps-rubella vaccine. National case counts have already surpassed the levels recorded in any year since measles was declared eliminated from the United States in 2000. Declining vaccination coverage in several communities has allowed chains of transmission to re-establish.

Maryland’s outbreak spans St. Mary’s, Carroll and Cecil counties. Local health departments have begun contact tracing and are offering free vaccination clinics. Schools and childcare centres in the affected areas have been advised to verify immunisation records and exclude unvaccinated children during active transmission.

Measles is highly contagious; an infected person can transmit the virus to 90 percent of susceptible close contacts. Complications include pneumonia, encephalitis and death, with higher risk among infants, pregnant women and immunocompromised individuals. The two Pennsylvania fatalities underscore that the disease remains life-threatening even in a high-resource setting.

Public-health authorities attribute the resurgence to pockets of vaccine hesitancy, gaps in routine childhood immunisation, and imported cases from regions where measles remains endemic. Catch-up vaccination campaigns have been launched in several states, yet coverage remains below the 95 percent threshold required for herd immunity in some counties.

Federal agencies continue to recommend two doses of MMR vaccine for all eligible children and adults born after 1956 who lack documented immunity. Hospitals have been instructed to maintain isolation protocols for suspected cases and to report immediately to state surveillance systems.

The Pennsylvania and Maryland developments arrive in the same week that Florida officials moved to repeal four required school vaccines, a decision that public-health groups have criticised as likely to widen immunity gaps. Other states are monitoring whether similar legislative efforts gain traction.

For clinicians the practical message is straightforward: maintain a high index of suspicion for measles in patients with fever and rash, especially those with incomplete vaccination histories or recent travel, and ensure rapid laboratory confirmation and isolation.

Whether the current clusters remain localised or seed larger outbreaks will depend on the speed of vaccination response and the willingness of communities with low coverage to accept the vaccine. The two deaths already recorded make clear that the cost of delayed action is measured in lives.