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Pennsylvania Measles Outbreak Hits 1,000 Cases
6 Oct
Summary
- Pennsylvania has over 1,000 measles cases this year, its largest outbreak in decades.
- The U.S. is experiencing its worst measles year since 1991, with nearly 3,900 cases.
- Low vaccination rates are cited as the primary cause of these widespread outbreaks.

Pennsylvania has recorded over 1,000 measles cases this year, marking its most significant outbreak in more than three decades. This situation contributes to a national crisis, with the U.S. experiencing its worst measles year since 1991, approaching 3,900 reported infections.
The current outbreak in Pennsylvania, which began west of Philadelphia in April, has resulted in 1,004 cases, 198 hospitalizations, and five deaths. Health experts universally point to declining vaccination rates as the root cause, with national coverage falling below the 95% threshold necessary for herd immunity.
Neighboring states like Ohio are also seeing substantial increases, with over 200 cases, particularly in areas with significant Amish populations known for lower vaccination uptake. New York has declared a state of emergency due to rising cases, extending vaccination eligibility to more healthcare professionals.
The Centers for Disease Control and Prevention has begun acknowledging measles-associated deaths in Pennsylvania, although there was a delay in its public data. The U.S. had previously eliminated domestic measles spread in 2000, but a resurgence is evident.