John Goldman, an infectious disease specialist with the University of Pittsburgh Medical Center (UPMC) in central Pennsylvania, recently encountered a medical phenomenon he had not witnessed in three decades: a clinical case of measles. For thirty years, the disease existed primarily in textbooks and historical archives for most American clinicians. However, since April, Goldman has seen dozens of patients presenting with the highly contagious virus, a trend that has sent shockwaves through the regional healthcare infrastructure. "I never thought I would see this come back," Goldman remarked, reflecting a sentiment shared by public health officials across the country as they grapple with a resurgence of a disease once considered eliminated in the United States.
The return of measles is not a localized anomaly but a burgeoning national crisis. As the United States sees its case counts climb past 3,600—the highest yearly total recorded since 1991—health systems are being forced to reactivate protocols that had long been gathering dust. From Pennsylvania to South Carolina, hospitals are redesigning patient flows, retrofitting ventilation systems, and implementing rigorous screening measures to contain a pathogen that is significantly more transmissible than influenza or even the original strains of COVID-19.
The Pennsylvania Outbreak: A System Under Pressure
The epicenter of Pennsylvania’s current struggle is Lancaster County, specifically the community of Lititz. The UPMC community hospital there has become a frontline facility in the state’s response. To date, the Lititz facility has evaluated approximately 50 patients suspected of having measles, with roughly 20 of those cases requiring inpatient hospitalization. This localized surge is part of a broader statewide trend; as of September 30, Pennsylvania has officially recorded 943 cases, leading to 176 hospitalizations and five deaths.
The severity of the situation has necessitated a rapid escalation in screening protocols. Clinicians at UPMC are now trained to identify the early, non-specific symptoms of the virus, which often mimic a severe common cold. Patients are screened for high fever, cough, coryza (runny nose), and conjunctivitis (red eyes). The challenge for diagnosis lies in the timing: the signature maculopapular rash—the classic measles hallmark—does not typically manifest until three to five days after the initial symptoms begin. This "prodromal" phase is when the patient is most contagious, often before they or their providers realize they are carrying the measles virus.
To mitigate the risk of nosocomial (hospital-acquired) transmission, UPMC has implemented a "parking lot triage" system. Physicians are instructed to call the emergency department ahead of time if they suspect a patient has measles. Upon arrival, the patient is met in their vehicle, provided with a mask, and escorted through a side entrance directly to a negative-pressure isolation room. These rooms utilize specialized ventilation systems that maintain lower air pressure than the surrounding hallways, ensuring that airborne particles are sucked into the filtration system rather than drifting into common areas.
Lessons from the South Carolina Surge
While Pennsylvania battles its current wave, South Carolina provides a sobering look at how quickly a localized cluster can evolve into a regional epidemic. Between October 2025 and March 2026, an outbreak centered in Spartanburg County and the upstate region resulted in 997 confirmed cases. The rapid spread caught many off guard, requiring health systems like Prisma Health in Greenville to innovate on the fly.
Robin LaCroix, a pediatric infectious disease physician at Prisma Health, noted that the post-pandemic landscape has changed how hospitals view patient movement. "Since Covid, we haven’t really had to think a lot about how we flow patients through a system, or the special things that we need to have in place to really protect not only the healthcare givers but also the other patients who are susceptible," LaCroix stated.
One of the primary hurdles Prisma Health faced was a shortage of permanent negative-pressure isolation rooms. During the peak of the outbreak, Greenville Memorial Hospital tested 400 patients and cared for 13 hospitalized individuals. When isolation capacity was reached, the hospital’s engineering department had to retrofit standard patient rooms. This involved the installation of portable air scrubbers equipped with high-efficiency particulate air (HEPA) filters. In some instances, entire sections of the hospital had to be reassessed to ensure that air-handling units were not sharing circulation with non-measles wards.
The Vulnerability of the Most Fragile
The resurgence of measles poses a particularly acute threat to populations that cannot be vaccinated, including newborns, the immunocompromised, and pregnant women. Because the first dose of the measles, mumps, and rubella (MMR) vaccine is typically not administered until a child reaches 12 months of age, infants remain entirely dependent on herd immunity for protection.
In response to the South Carolina outbreak, Prisma Health implemented "newborn-only" entry protocols. Parents were instructed to call from their cars upon arrival for well-baby checkups and were ushered through dedicated entrances to avoid waiting rooms where they might be exposed to undiagnosed cases.
Similarly, Geisinger Medical Center in Danville, Pennsylvania, was forced to tighten visitation rules for its neonatal intensive care unit (NICU) following a potential exposure incident in August. The facility now limits NICU access exclusively to parents or legal guardians, provided they pass a rigorous symptom screening. These protocols were expanded to the entire children’s hospital in September as the regional case count continued to rise.
Clinical Interventions and the Logistics of Testing
For those exposed to the virus, the window for medical intervention is remarkably narrow. Jennifer Janco, chair of pediatrics for St. Luke’s University Health Network, emphasizes that the MMR vaccine can prevent infection or significantly reduce the severity of the illness if administered within 72 hours of exposure. For those at higher risk, such as infants or pregnant women, immune globulin—a concentrated solution of antibodies—can be administered up to six days after exposure.
However, the effectiveness of these interventions is often hampered by the logistics of diagnostic testing. Because measles was rare for so many years, very few hospitals maintain the equipment or reagents necessary for in-house testing. Swabs must be sent to state public health laboratories or large commercial labs, with a turnaround time of one to three days.
"There’s a narrow window of time to offer prevention for exposed, vulnerable people," Janco noted. To bridge this gap, the Pennsylvania Department of Health has, in some cases, sent representatives directly to patients’ homes to collect samples, preventing potentially infected individuals from entering public spaces or medical offices.
The Operational and Economic Toll
Beyond the clinical risks, the measles comeback is causing significant operational disruptions. The measles virus is famously hardy; it can remain suspended in the air for up to two hours after an infected person has left a room. In an urgent care or primary care setting, a single suspected case can effectively decommission an exam room for several hours, leading to cascading delays for other patients.
To manage the load, many health systems have pivoted back to telemedicine. During the height of the South Carolina outbreak, pediatricians used video visits to monitor patients twice daily, only bringing them into the physical clinic if their condition deteriorated to the point of requiring oxygen or intravenous fluids.
"It is a resource strain," Janco admitted. "There are so many pieces that have to fall into place to make sure that we’re doing everything we can to contain this."
Analysis: The Erosion of Herd Immunity
The current crisis is a direct consequence of declining vaccination rates. Measles requires a very high threshold of population immunity—roughly 95%—to prevent sustained transmission. As vaccine hesitancy has grown and routine childhood immunization schedules were disrupted during the COVID-19 pandemic, that "firewall" of protection has begun to crumble in specific geographic pockets.
The 3,600 cases reported this year represent more than just a statistic; they signal a regression in public health. In 1991, the year of the last comparable surge, the US was in the midst of a multi-year resurgence that eventually prompted a massive federal push to immunize underserved children. Today, the challenge is different, often involving a mix of vaccine misinformation and a lack of firsthand experience with the disease’s severity among younger generations of parents.
As hospitals continue to dust off decades-old manuals and engineers measure airflow in patient wards, the medical community is sending a clear message: measles is no longer a disease of the past. The current outbreaks in Pennsylvania and South Carolina serve as a warning that without a concerted effort to restore vaccination levels, the "new normal" for American hospitals will involve a permanent state of vigilance against a virus that the nation once thought it had defeated.
