"San Mateo County public health officials confirmed Thursday that a positive case of measles has been reported in the area - appearing to make it California's first measles case of 2026. In 2025, the county confirmed a previous measles case that also followed international travel, Merchant noted. In its weekly report, the California Department of Public Health has recorded one measles case statewide in 2026."
"Symptoms of measles - a highly contagious virus that spreads through direct contact with infectious droplets - include fever, cough, runny nose and pink eye, followed a few days later by a rash. These symptoms can emerge between seven and 21 days after exposure. About 1 in 5 unvaccinated people who become infected with measles will require hospitalization, according to the CDC. In some people, the disease can be fatal."
"The San Mateo County case this week comes on the heels of Contra Costa Health's Dec. 29 announcement that a case of measles had been confirmed in that county, in an individual who had been contagious in public between Dec. 17 and Dec. 24. According to CDC data from the 2023-24 school year, California has a 96.2% vaccination rate against measles."
San Mateo County public health officials confirmed a positive measles case, potentially California's first of 2026. The county had a prior measles case in 2025 associated with international travel. The California Department of Public Health recorded one statewide measles case in 2026 but had not confirmed if it matched San Mateo's case. Measles spreads through infectious droplets and causes fever, cough, runny nose, pink eye, and a rash seven to 21 days after exposure. About 20% of unvaccinated infected people require hospitalization and some infections can be fatal. Contra Costa County recently reported a contagious late-December case.
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