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U.S. Records Over 1,300 Measles Cases in Biggest Outbreak Since 1991

Health officials warn that falling MMR coverage leaves the nation at risk of losing its measles-free certification.

2025 US measles outbreak
Doctor holding vaccine injection
FILE – Health department staff members enter the Andrews County Health Department measles clinic carrying doses of the measles, mumps and rubella vaccine, Tuesday, April 8, 2025, in Andrews, Texas. (AP Photo/Annie Rice, File)
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Overview

  • CDC data show 1,309 confirmed measles cases as of July 15 across at least 40 states.
  • Texas remains ground zero with 762 cases reported since late January, accounting for more than half of the national total.
  • Unvaccinated individuals or those with unknown vaccination status make up 92% of cases and 13% of patients required hospitalization.
  • Three deaths have been linked to this outbreak and experts caution that sustained spread could invalidate the U.S. measles elimination declaration from 2000.
  • With kindergarten MMR coverage down to 92.7%, health authorities are urging immediate vaccination to restore herd immunity and curb further transmission.