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yesterday

Bay Area Health Officials Warn of Measles Exposures Linked to International Traveler

Health agencies listed three Bay Area exposure sites, calling on unvaccinated visitors to verify immunization records, monitor symptoms

Trader Joe’s at 1306 Great Mall Parkway in Milpitas, Calif.
Starbucks at 35040 Newark Blvd. in Newark, Calif.
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.
Computer illustration of a measles virus particle.

Overview

  • An adult Bay Area resident tested positive for measles after returning from international travel and passing through a U.S. airport, prompting joint alerts from Santa Clara and Alameda County health departments.
  • The individual is isolating at home without hospitalization and visited H Mart in San Jose on May 21, Starbucks in Newark on May 23 and Trader Joe’s in Milpitas on May 25 during the infectious period.
  • Anyone present at those locations during the specified times who lacks immunity or is unsure of vaccination status should review immunization records and watch for fever, cough, runny nose, red eyes and rash for seven to 21 days.
  • A joint press conference is set for May 30 at 9:30 a.m. in San Jose, where health officials will outline prevention measures, vaccination guidance and steps for potentially exposed individuals.
  • With over 1,000 measles cases reported nationwide in 2025, authorities stress that two doses of the MMR vaccine provide about 97% protection and remain critical to containing the outbreak.