Radnor and Haverford families whose children still need their MMR shots have a new, free option: the Delaware County Health Department's mobile vaccine clinic is rolling out Monday, ahead of fall school registration deadlines.

The health department announced its 2026 Back-to-School immunization campaign on Tuesday, offering free clinics, online scheduling tools and a new mobile health unit called Wellness on Wheels. The effort comes as Pennsylvania's measles caseload climbs. The state Department of Health had confirmed 114 cases as of Sunday, according to the county's press release.

Both the Radnor Township School District and Haverford Township School District require MMR vaccination for students in all grades, K-12. Haverford's Policy 203 states that students who lack at least one dose of a required vaccine upon entry risk exclusion from school. Radnor's board updated its own Policy 203 in spring 2026, approving revised immunization-timeline language at its May 26 meeting.

"Measles can be dangerous, and it is vital that Delaware County residents receive their MMR vaccines so that we can protect our most vulnerable populations," Lora Siegmann Werner, director of the Delaware County Health Department, said in the announcement.

The campaign's first public event is Monday, July 27, from 11:30 a.m. to 12:30 p.m. at Observatory Park, 101 Tobacco Road, Upper Darby Township. The Wellness on Wheels mobile unit will be on-site, and Delaware County Council Member Dr. Monica Taylor will join Werner. Taylor called measles "preventable through vaccination" and said the health department is providing shots to children across the county as part of the back-to-school push.

Two doses of the MMR vaccine are 97% effective at preventing measles, even after exposure to the virus, according to the health department. One infected person can spread measles to as many as 18 others through breathing, coughing or sneezing.

The regional picture is worsening. Chester County reported 13 confirmed cases as of Wednesday, according to 6abc (WPVI). The neighboring state of Delaware declared a measles outbreak the same day after four cases surfaced in its Kent County. Nationally, the CDC had confirmed 2,260 cases across 44 states by mid-July.

Delaware County's kindergarten MMR vaccination rate was 94.3% during the 2024-25 school year, according to health department data published June 17. That same report disclosed that measles had been detected in DELCORA wastewater samples collected June 9 and June 11, though no county residents had confirmed infections at that time.

Families can also get MMR vaccines at their pediatrician's office, local pharmacies, urgent care centers, or DCHD immunization clinics. Vaccines are free for uninsured residents. Children under 18 must be accompanied by a parent or guardian, and families should bring previous immunization records. The DCHD Wellness Line, (484) 276-2100, is available 24/7.