Pennsylvania faces worst measles outbreak of the year with nearly 800 cases and four deaths

Pennsylvania has reported nearly 800 cases of measles since April, prompting urgent vaccination efforts amid the worst outbreak in the United States this year, with four deaths and over 150 hospitalisations recorded.

Pennsylvania has confirmed 792 measles cases in 39 counties since the outbreak began in late April, with the state now counting four deaths and 155 hospitalisations. The Pennsylvania Department of Health said 97 new infections were recorded between 14 and 21 September, underscoring what officials have called the worst measles outbreak in the United States this year.

State health officials have urged residents who have not been vaccinated to get the measles, mumps and rubella, or MMR, vaccine, and for adults to check whether their immunisation records are complete. According to the department, people with two documented doses do not need another shot, while those with only one dose or no records should speak with a health care provider or pharmacist.

The department said the MMR vaccine offers 97% lifetime protection after two doses. It has also expanded access to vaccination through pop-up clinics, administering more than 4,800 doses at 148 sites in affected communities since the outbreak began. Free MMR vaccinations are scheduled at the Bloomsburg Fair in Columbia County from 26 September through 3 October.

Measles spreads easily through coughs, sneezes and even lingering virus particles in the air or on surfaces. The department said nearly one in five people with measles needs hospital treatment, and the illness can lead to pneumonia or brain swelling. Symptoms often begin seven to 21 days after exposure and include fever, cough, a runny nose and red, watery eyes before a rash appears and spreads downward. People who think they may have been exposed and are developing symptoms are being advised to contact a doctor or call the state hotline at 877-724-3258, ext. 101.