Oxford Area High School Closes After Measles Case

Oxford Area High School in Chester County, Pennsylvania, closed to students and staff on Friday, Oct. 9, 2026, after officials confirmed a measles case within the school community. The Oxford Area School District suspended in-person activities to verify employee immunity records and coordinate with county health authorities investigating potential exposures.

Pennsylvania had recorded 1,078 measles cases as of 2 p.m. Wednesday, according to the Pennsylvania Department of Health. Chester County accounted for 86 cases, making it the most affected county in the five-county Philadelphia region, according to reports published Oct. 8 and 9.

The district completed enhanced cleaning and disinfection of the high school, according to Superintendent David Woods and a district statement. Officials did not identify whether the confirmed case involved a student, employee or another member of the school community.

The Chester County Health Department is leading the exposure investigation and will contact people identified as potentially exposed. Anyone who is unvaccinated against measles or cannot provide proof of vaccination must remain away from school and school-related activities for 21 days following a potential exposure, according to district instructions.

The district acknowledged families' concerns in its communication about the closure.

"We understand that news like this may be concerning for families," the district said in a statement.

Woods said the closure would allow the district to verify staff immunity documentation as directed by the county health department. Pennsylvania requires schools to track and report vaccination records for students, but state law does not impose the same reporting requirement on employees.

County health officials had worked with school nurses and superintendents before the academic year to prepare for possible measles transmission, according to Jeanne Franklin, director of the Chester County Health Department, who discussed those preparations earlier in the week.

The county had also alerted schools before classes began that they would need to establish the vaccination status of staff and volunteers if a positive case emerged. The district has not confirmed whether the high school would reopen the following Monday or whether planned homecoming activities would proceed.

Pennsylvania is experiencing its largest measles outbreak in more than three decades, according to reporting by The Philadelphia Inquirer. The outbreak began in April and has spread to more than half of the state's 67 counties, with Lancaster County, near the Philadelphia region, serving as its center.

Chester County reported its first cases of the current outbreak at the end of June. Cases have been concentrated near the county's western border with Lancaster County, and Oxford lies in Chester County's southwestern corner.

Measles spreads through the air when infected people breathe, cough or sneeze, and the virus can remain in the air for hours, according to the Centers for Disease Control and Prevention. Symptoms can include fever, cough, runny nose, red and watery eyes, and a rash that typically begins on the face before spreading across the body.

The disease can cause serious complications, including pneumonia and brain swelling, particularly in young children. The CDC recommends two doses of the measles, mumps and rubella vaccine. One dose is 93% effective against measles, while two doses are 97% effective, according to the agency.

Vaccination coverage remains a concern in the Philadelphia region. An Inquirer analysis of school immunization data found that at least 40% of kindergartens in the region were vulnerable to an outbreak during the previous school year, up from 33% the year before.

Available school records showed that all 303 Oxford Area High School seniors received the MMR vaccine during the 2025-2026 school year. Penn's Grove School, the district's middle school, reported a 96.3% vaccination rate among seventh graders during the same academic year.

Public health officials identify approximately 95% community vaccination coverage as the level needed to prevent sustained measles transmission. The county health department continues to manage exposure investigations and provide instructions to people identified as potentially affected.