A 33-foot mobile clinic parked at Observatory Park in Upper Darby this week and began giving catch-up vaccines to families ahead of the school year. Three people were vaccinated that first day. The Delaware County Health Department considers that a start, not a disappointment, because the county has not recorded a single measles case yet and is trying to keep it that way.
Pennsylvania has now confirmed 142 measles cases in 2026, the state's highest total in more than three decades, according to figures reported by the Philadelphia Inquirer. Cases are concentrated in Lancaster and Lebanon counties, with spread into Chester County, and the state of Delaware declared its own outbreak in Kent County this month.
For families in the Philadelphia suburbs, this is the rare public health story with a concrete next step attached. The Wellness on Wheels clinic is making stops across Delaware County offering vaccines, physicals, and STI testing as part of a back-to-school campaign, and it is designed for exactly the households that fall through the cracks: families without a regular pediatrician, families who lost paperwork, and families who arrived from abroad without records.
Why a County with Zero Cases Is Running an Urgent Campaign
Lora Siegmann Werner, director of the Delaware County Health Department, framed the timing plainly. "We don't have to have measles here," she said, describing the current period as the window to prevent local transmission before the virus arrives.
The math behind that urgency is specific. In the 2024-25 school year, 94.3 percent of Delaware County kindergarteners had received the measles, mumps, and rubella vaccine. That is just below the roughly 95 percent threshold scientists say is needed for community protection, and county-level averages hide sharper problems: the Philadelphia region contains individual schools with far lower coverage, creating pockets where a single introduction can spread quickly.
Exemption filings are moving in the wrong direction. About 740 families across the five-county Philadelphia region claimed religious exemptions from vaccination in 2024, a 76 percent increase over five years, alongside 568 philosophical exemptions, up 49 percent from 2019, according to an Inquirer analysis of state data. Pennsylvania permits medical, religious, and philosophical exemptions, making it one of the easier states in which to opt out.
Access is a separate problem from hesitancy, and Delaware County has both. The county lost its dominant health system when Crozer Health closed its two remaining hospitals last year, which pushed primary care further out of reach for many residents. A clinic that drives to a neighborhood park addresses a different barrier than a persuasion campaign does.
What Parents Should Do if Vaccination Records Are Missing
The record problem is more common than most families expect, and it has a straightforward answer.
Children who were vaccinated in another country, or whose paperwork was lost in a move, do not need to track down old documents before acting. Among the mobile clinic's first clients were two sisters, ages 14 and 20, who moved to Delaware County from Africa earlier this year without their vaccination paperwork and needed second doses before the school year. Their father brought them to the park.
The MMR vaccine is normally given in two doses, the first around a child's first birthday and the second before kindergarten. Two doses are about 97 percent effective at preventing measles, and one dose is about 93 percent effective, according to the CDC. Getting an extra dose when prior doses cannot be documented is not harmful, and clinicians routinely handle this situation.
State health officials have also recommended that parents living in or traveling to counties with active measles transmission consider vaccinating infants earlier than the standard schedule. That is a decision to make with a clinician, not on the basis of a news article.
The National Picture Behind the Local Campaign
The United States confirmed 2,318 measles cases in 2026 as of July 23, surpassing the 2,289 recorded in all of 2025 and making this the worst measles year since 1991, according to CDC surveillance data published July 24. About 93 percent of cases have occurred in people who were unvaccinated or whose status was unknown. Roughly 7 percent of patients, 151 people, have been hospitalized. No measles deaths have been reported in 2026, compared with three in 2025.
Andrew Racine, president of the American Academy of Pediatrics, described the year in remarks reported by CIDRAP, saying the country "is experiencing the worst year for measles since 1991."
The structural driver is coverage. National MMR vaccination among kindergarteners fell from 95.2 percent in the 2019-20 school year to 92.5 percent in 2024–25, leaving an estimated 286,000 kindergarteners unprotected in a single cohort.
Who Faces the Highest Risk and What Symptoms to Watch
Risk is not evenly distributed. The people most vulnerable are unvaccinated children, infants under 12 months who are too young for a first dose, pregnant people without immunity, and anyone with a weakened immune system, including patients on chemotherapy or immunosuppressive drugs. Adults uncertain of their own childhood vaccination status are also in this group.
Measles typically begins with high fever, cough, runny nose, and red or watery eyes, followed several days later by a rash that starts at the hairline and spreads downward. Small white spots may appear inside the mouth. Complications include pneumonia and encephalitis, and hospitalization is common in young children.
Anyone who suspects measles should call ahead before going to a clinic or emergency room. Walking into a waiting room with measles exposes everyone in it, because the virus stays infectious in the air for up to two hours after an infected person leaves.
MMR is covered without cost sharing by most private insurance under the Affordable Care Act's preventive services rules and by Medicaid. The federal Vaccines for Children program provides free doses for uninsured and underinsured children at participating providers. Adults without insurance can contact the county health department directly.
Delaware County has not reported a measles case. That is the current fact, and it may not hold. Families in the county have a short window in which a free or low-cost shot at a neighborhood park is a genuinely useful use of an afternoon. What remains unknown is whether coverage can be raised meaningfully before school reopens, and whether the outbreak in Lancaster and Chester counties reaches the Philadelphia suburbs first.
Frequently Asked Questions
Has measles been reported in Delaware County? No. As of the county health department's statements this week, Delaware County had not reported a measles case. Cases are concentrated in Lancaster and Lebanon counties with spread into Chester County.
Where is the Wellness on Wheels clinic going? The mobile clinic is making stops across Delaware County through the back-to-school campaign, beginning at Observatory Park in Upper Darby. Current locations and hours are posted by the Delaware County Health Department.
What if my child's vaccination records were left in another country? Bring the child anyway. Clinicians can give catch-up doses without prior documentation, and an additional MMR dose in someone already vaccinated is not harmful.
How many doses of MMR does a child need? Two. The first is typically given around age 1 and the second before kindergarten. Two doses are roughly 97 percent effective at preventing measles.
What are the first symptoms of measles? High fever, cough, runny nose, and red or watery eyes, followed a few days later by a rash starting at the hairline. Small white spots may appear inside the mouth.
Should I go to the emergency room if I think my child has measles? Call ahead first. Measles remains infectious in the air for up to two hours, and arriving unannounced exposes other patients. A clinician can arrange isolation before you arrive.
Is the MMR vaccine free? It is covered without cost sharing by most private insurance and by Medicaid. The Vaccines for Children program covers uninsured and underinsured children. Uninsured adults should contact their county health department.
