SANTA CLARA COUNTY, CA — Health officials in the Bay Area have issued a warning following the confirmation of a measles case in a Santa Clara County resident, urging residents who visited three specific locations to be vigilant for symptoms and check their vaccination status.

The Santa Clara County Public Health Department, in coordination with the Alameda County Public Health Department, announced the potential exposure sites during a press conference held Friday in San Jose. The identified locations include the H-Mart supermarket at 1710 Oakland Road in San Jose on May 21 between 7:15 p.m. and 9 p.m., a Starbucks at 35040 Newark Boulevard on May 23 from 11:45 a.m. to 2 p.m., and a Trader Joe’s at 1306 Grand Mall Parkway in Milpitas on May 25 between 4:45 p.m. and 8 p.m.

Health officials are advising anyone who was present at these locations during the specified times to monitor themselves for symptoms of measles for up to three weeks after potential exposure. Symptoms commonly associated with measles include fever, rash, cough, conjunctivitis (red eyes), and runny nose.

Dr. Kavita Trivedi, Alameda County’s director of clinical guidance and communicable disease controller, emphasized the importance of symptom awareness, while Dr. Sarah Rudman, acting public health director for Santa Clara County, urged residents who are unvaccinated, pregnant, have a weakened immune system, or have unvaccinated young children to contact their healthcare provider immediately.

“Measles is one of the most contagious diseases known, and the MMR vaccine remains the most effective way to prevent its spread,” Dr. Rudman said.

The individual who tested positive is an adult resident of Santa Clara County who recently returned from international travel. According to health officials, the patient did not require hospitalization and was recovering at home as of Friday.

Officials also noted that there is no ongoing risk of exposure at the affected locations beyond the dates and times listed.

This case marks the first confirmed measles diagnosis in Santa Clara County since 2019. In 2024, Alameda County reported a measles case that similarly prompted public warnings.

Residents are encouraged to verify their vaccination records through healthcare providers or by visiting myvaccinerecord.cdph.ca.gov.