US Faces Worst Measles Outbreak Since 1991 Amid Surging Pennsylvania Infections
Key Takeaways
- Pennsylvania has recorded over 1,000 measles cases, with nearly 200 hospitalizations and five deaths.
- The CDC has reported 3,869 nationwide cases, making this the worst US outbreak since 1991.
- New York declared a state of emergency as national vaccination rates dropped below the 95% herd immunity threshold.
More than 1,000 cases of measles have been recorded this year in Pennsylvania alone, health officials announced Monday, marking the largest single-state outbreak in the United States since the early 1990s. The surge contributes to a nationwide tally of 3,869 cases reported so far this year by the US Centers for Disease Control and Prevention (CDC), cementing 2024 as the worst year for measles spread across the country in over three decades.
The Pennsylvania outbreak originated west of Philadelphia in April, resulting in nearly 200 hospitalizations and five deaths. According to the Pennsylvania Department of Health, nearly all confirmed infections involved individuals who were not vaccinated. In neighboring New York, Governor Kathy Hochul declared a month-long disaster emergency after recording over 100 cases outside New York City, mostly in under-immunized rural pockets. "No one should get seriously ill or die from a vaccine-preventable disease," Hochul stated, issuing an executive order that empowers paramedics and midwives to administer vaccines.
Measles, a highly contagious airborne virus that causes fever, cough, and characteristic rashes, can lead to severe health complications, particularly among young children. Although the United States declared domestic transmission eliminated in 2000, national vaccination rates have recently slipped below the 95% threshold required to maintain community herd immunity. Public health experts attribute this decline to rising skepticism and misinformation regarding routine childhood immunizations.
The widespread resurgence has reignited political and public health debates over inoculation mandates. Multi-state clusters have also been registered in Texas, Utah, and South Carolina, where case counts approach 1,000. As federal health leadership faces scrutiny over mixed messaging, state authorities are expanding local healthcare access and emergency testing to halt further transmission before school terms resume.
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