Meanwhile, a larger outbreak is unfolding in Pennsylvania, which has the nation’s largest Amish population, estimated at 96,000 residents across 67 settlements, with nearly half located in Lancaster County. Lancaster County’s reported measles cases have surpassed 500, though local infectious disease experts suspect the actual number is at least twice that figure. While some blame Plain communities for the outbreak, experts note that low vaccination rates in these groups have persisted for centuries. The current surge is attributed to a broader decline in community immunity, with school thresholds for herd immunity falling below critical levels.
Measles is described as one of the most contagious viruses globally. The virus can linger in enclosed spaces, such as hospital waiting rooms or classrooms, for up to two hours after an infected person leaves. Susceptible individuals, including infants and those with compromised immune systems, face a 90% chance of infection if exposed during this window. In Todd County, Minnesota, a separate outbreak has resulted in 115 reported cases, three hospitalizations, and five emergency room visits as of Nov. 9. Health officials in Minnesota are working with state and local systems to identify exposed families and provide guidance.
Health authorities stress that vaccination is the most effective protection against measles. The MMR (measles, mumps, and rubella) vaccine has been administered since 1971, with decades of data confirming its safety and efficacy. One dose of the MMR vaccine is 93% effective at preventing measles. The Centers for Disease Control and Prevention recommends two doses for children: the first between 12 and 15 months of age, and the second between ages 4 and 6. Vaccination protects not only the recipient but also vulnerable groups, such as pregnant individuals and those unable to be vaccinated due to medical conditions.
Public health officials advise that individuals experiencing symptoms contact their healthcare provider before visiting medical facilities to prevent spread in waiting rooms. In Pennsylvania, where the outbreak is most severe, a state disaster emergency has not been declared, contrasting with New York, which declared an emergency with 108 cases in October and now reports 210 confirmed cases. Despite the lack of a formal emergency declaration in Pennsylvania, local health departments are actively monitoring contacts and providing support to affected residents.
