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South Carolina Measles Outbreak Grows to 144 as U.S. Cases Near 2,000

Falling vaccination rates are fueling multi-state transmission that is prompting quarantines.

Overview

  • South Carolina health officials report 144 cases in the Upstate region, adding nine since Tuesday, with 224 people in quarantine and four in isolation.
  • The CDC counts 1,958 U.S. cases and 49 outbreaks so far in 2025, with about 11% hospitalized and three deaths confirmed.
  • Arizona reports 190 cases, largely in Mohave County with 97% unvaccinated, while Utah lists 125 cases with recent school and healthcare exposures.
  • Most infections are in unvaccinated people, and kindergarten MMR coverage has fallen below the 95% threshold required for community protection.
  • Health experts refute viral claims that measles protects against cancer, noting Mayo Clinic’s 2014 case involved an engineered virus distinct from natural infection.