Oxford Area High School in Chester County, Pennsylvania, will be closed to all students and staff on Friday, October 9, after a confirmed measles case connected to the campus community. The district announced the closure late Thursday, saying it needs the day to audit and verify measles immunity records for every staff member working inside the high school building — a protocol mandated by the Chester County Health Department (CCHD).
Superintendent David A. Woods wrote in a letter to families that county health officials are leading contact tracing and will directly notify anyone determined to have had direct exposure to the infected person. The exclusion rules are strict: unvaccinated individuals or those unable to produce valid proof of immunization "can NOT attend school or school functions and must be quarantined 21 days from school and all school functions." Maintenance crews will carry out enhanced cleaning and sanitization throughout the facility during the closure.
The closure comes amid the nation's worst measles outbreak since the disease was declared eliminated in the United States. As of October 5, Pennsylvania has reported 1,004 confirmed cases across 39 counties, with 198 hospitalizations and five deaths. Lancaster County leads with 391 cases, followed by Mifflin with 118 and Chester with 84. Allegheny County confirmed a case on October 5 — an unvaccinated minor under 18 now recovering at home — with no school-related exposures.
According to the CDC, two doses of the measles-mumps-rubella (MMR) vaccine are about 97% effective at preventing infection; fewer than 1% of Pennsylvania's cases were in vaccinated people. Measles spreads when an infected person breathes, coughs or sneezes, and the virus can remain in the air for up to two hours after the person leaves. Symptoms typically appear 7 to 14 days after exposure: high fever, cough, runny nose and red, watery eyes, followed by a rash that starts at the hairline and spreads downward.
Health officials advise parents to check children's immunization records through their pediatrician or school nurse. Adults born in 1957 or later who are unsure of their status can ask a clinician about vaccination or a blood test showing immunity. Pennsylvania residents can call 877-PA-HEALTH with questions. Anyone who suspects measles should call a doctor's office or emergency room before arriving, so staff can prevent exposures in waiting rooms.