Pennsylvania launched an online measles dashboard on Sunday, giving families a county-by-county look at the outbreak that has produced 111 confirmed cases statewide in 2026. Chester County, which borders Delaware County directly to the west of Radnor and Haverford townships, has recorded seven cases.
Lancaster County leads the state with 68 confirmed cases, followed by Lebanon County at 20. Montgomery County has three. The dashboard at pa.gov/measles will be updated Mondays, Wednesdays and Fridays with case counts, demographic breakdowns, hospitalization rates and the vaccination status of confirmed cases.
Every confirmed case in Pennsylvania this year has been in a person who was unvaccinated or whose vaccination status could not be determined, according to the Department of Health.
Chester County timeline
Chester County health director Jeanne Franklin confirmed the county's first two cases on June 30, the first in the Philadelphia suburban area since winter. The count has since grown to seven on the new dashboard.
Measles was also detected in Delaware County wastewater samples collected June 9 and June 11 from the DELCORA Western Regional Treatment Plant, which serves roughly 500,000 people across 46 municipalities in Delaware and Chester counties, PennLive reported. No confirmed cases in Delaware County have appeared on the state dashboard as of July 20.
Chester County's kindergarten vaccination rate sits at 94.5 percent, according to state data. That is half a percentage point below the 95 percent threshold public health officials consider necessary to prevent community spread.
What Radnor and Haverford families need to know
Both Radnor Township School District and the School District of Haverford Township require up-to-date immunization records, including the MMR vaccine, for all students in grades K-12 under Pennsylvania law. These are standing requirements, not new rules triggered by the outbreak.
Haverford's Policy 203 adds a provision relevant to the current situation: students who hold a vaccination exemption may be excluded from school during an outbreak of a communicable disease against which they are not immunized.
"We continue working tirelessly to contain the spread of this highly contagious virus among people who are not vaccinated," Pennsylvania Secretary of Health Dr. Debra Bogen said in the dashboard announcement on July 20.
Two doses of the MMR vaccine are 97 percent effective at preventing measles, according to the Department of Health. In late June, the state issued guidance allowing providers to vaccinate infants as young as 6 months old when measles is spreading locally.
Registration and resources
Families registering new students in Radnor can visit the Central Registration office at 135 South Wayne Ave., Wayne, open Monday through Friday, 8 a.m. to 4 p.m. Haverford families can register online or contact registrar Nathaniel Werschulz at 610-853-5900, ext. 7139.
Anyone experiencing symptoms — fever, cough, runny nose, red watery eyes followed by a rash — should call 877-PA-HEALTH (877-724-3258) before visiting a clinic.
What's next
The Department of Health plans to release school-level vaccination data online in August, which would let families see immunization rates at individual Radnor and Haverford schools. The dashboard at pa.gov/measles is the most current public source for tracking the outbreak's reach into the region.
