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New Measles Alerts Span DC, California and Wisconsin as U.S. Cases Climb

Officials link the resurgence to low MMR coverage, warning that continued spread could jeopardize measles elimination status.

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California health officials are urging all residents to check their measles vaccination status in the wake of the state’s first outbreak of the disease since 2020.
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Overview

  • CDC data through Feb. 5 list 733 U.S. measles cases across 20 states, with roughly 92%–95% unvaccinated or of unknown status and the country at risk of sustained transmission.
  • South Carolina remains the epicenter with about 920 cumulative infections since last fall, including 546 reported in 2026.
  • DC Health issued exposure notices tied to the Jan. 23 March for Life and other sites such as the Basilica, Reagan National Airport and Metro, with case counts not specified.
  • California confirmed 17 cases in 2026 and its first outbreak since 2020 in Shasta County (eight linked cases), plus two infectious Disneyland visits on Jan. 22 and Jan. 28; those infected were unvaccinated or with unknown status.
  • Milwaukee is testing wastewater after a Jan. 29 flight exposure from Phoenix, with identified contacts advised to quarantine, while North Carolina flagged multiple Raleigh locations for potential exposure and Pennsylvania confirmed five unvaccinated cases in Lancaster County.