According to data released by the Pennsylvania Department of Health in the US on the 5th, the cumulative number of confirmed measles cases in the state in 2026 reached 1004, including 5 deaths. This is the largest state-level measles outbreak in the US in more than 30 years. On the 5th, New York State declared a “state of disaster emergency” due to the measles outbreak. According to the Pennsylvania Department of Health, the outbreak began in late April, and 39 counties across the state have reported confirmed cases of measles. Since October 2, 27 new cases have been confirmed in the state. Of the total number of confirmed cases, only 4 cases occurred in people who had received the measles, mumps, and rubella triple vaccine, accounting for less than 1%.

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