A person infected with measles recently traveled through San Francisco International Airport and visited two popular grocery stores in San Jose, as reported by health officials.
This case concerns an adult from Santa Clara County who was contagious while at the airport on Thursday morning between 8:30 a.m. and 11 a.m.
The individual went through various areas in the international terminal, including passport control, customs, and baggage claim.
Later that same evening, from 8 p.m. to 10 p.m., the individual was at Trader Joe’s and International Halal Market in San Jose.
Officials noted that anyone who was at these locations during the indicated times might have been exposed.
Given that measles is extremely contagious, symptoms could show up seven to ten days post-exposure. Symptoms may include fever, cough, runny nose, red eyes, and rash.
Unvaccinated individuals are advised to quarantine, steer clear of large crowds, and keep an eye out for any signs of illness for up to three weeks.
Health officials urged pregnant women, infants, those with compromised immune systems, and unvaccinated people to seek medical advice immediately if they suspect exposure.
If symptoms develop, individuals should contact a healthcare provider before visiting in person, to minimize the risk of spreading the virus further.
This situation arises as California is seeing its highest number of reported measles cases in seven years.
As of June 8, the state has recorded 49 confirmed cases, nearly twice the total seen in all of 2025, and the highest since a reported 73 cases in 2019.
Data indicates that 94% of these cases involve unvaccinated individuals, with over 80% occurring in those under 19, showcasing a concerning gap in immunity despite generally high vaccination rates in the Bay Area.
Dr. Sarah Rudman, the health officer for Santa Clara County, emphasized that vaccination is the best defense against measles and can help prevent widespread outbreaks, even when there are exposures.
County officials are working closely with the California Department of Public Health and the US Centers for Disease Control and Prevention on contact tracing connected to the exposure sites.
Previously, Santa Clara County has issued similar warnings about measles exposure, indicating ongoing challenges with outbreaks originating from international travel and areas of low vaccination uptake.
On a national level, there’s been a resurgence of measles, including a significant outbreak in West Texas in 2025 that resulted in over 750 cases and multiple hospitalizations, with two deaths among unvaccinated patients.
