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San Mateo County saw the first California measles case of 2026 earlier this month after an unvaccinated adult tested positive after returning from an international trip, San Mateo County Health Officials confirmed on Jan. 15.
While officials did not share any details about the individual due to privacy concerns, Communications Officer Preston Merchant said the county completed its contact tracing and that no one else developed symptoms.
As of Jan. 19, it remains the only confirmed measles case in California.
Merchant said overseas measles exposure is fairly common and since local vaccination rates are high, the county determined the risk to the public was low.
“In this case, we were confident that we were able to identify and reach the persons who may have been exposed by this case,” Merchant said.
The county did not issue a proactive statement but the data was shared on the California Department of Public Health website. KQED first reported on the year’s first measles case.
CDPH recommends that travelers ensure they are up to date on all vaccines before international travel.
In 2025, there were 25 confirmed cases of measles in California.
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