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3w ago

CDC Counts 733 Measles Cases Nationwide as Exposure Alerts Expand Across States

Health agencies warn that falling vaccination rates are fueling sustained transmission that could cost the U.S. its measles‑elimination status.

More than 1,000 cases of measles have been reported in South Carolina. (CDC/ Allison M. Maiuri, MPH, CHES/TNS/TNS)
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Measles virus particle, illustration. This virus, from the Morbillivirus group of viruses, consists of an RNA (ribonucleic acid) core surrounded by an envelope studded with surface proteins haemagglutinin-neuraminidase and fusion protein, which are used to attach to and penetrate a host cell. Measles is a highly infectious itchy rash with a fever. It mainly affects children, but one attack usually gives life-long immunity.

Overview

  • Federal data show 733 confirmed infections this year, more than four times a typical annual total, with cases reported across at least 20 states.
  • South Carolina reported 44 new infections, bringing its Upstate outbreak to 920 cases, with hundreds in quarantine and most patients unvaccinated.
  • Authorities issued fresh exposure notices in Washington, D.C., including Union Station and Reagan National Airport, and in Milwaukee after Southwest Flight WN 266 arrived Jan. 29.
  • Maine confirmed its first measles case since 2019 and San Bernardino County recorded its first since 2023, with officials listing potential exposure at an Ontario Walmart.
  • College settings are now affected, with multiple cases at Ave Maria University and contact tracing at the University of Florida, as experts stress two MMR doses offer about 97% protection and most recent U.S. cases are in the unvaccinated or of unknown status.