Measles Case Linked to SFO Visit Sparks Health Alerts in California

WHO:

Yahoo - An adult from Santa Clara County was infected with measles.

Mercury News - The Santa Clara County Public Health Department is involved in the response.

WHAT:

Yahoo - The Santa Clara County Public Health Department reported that 94% of measles cases involve unvaccinated individuals, and more than 80% are in people under 19, highlighting ongoing gaps in immunity despite generally high vaccination coverage in the Bay Area.

Mercury News - The department advised individuals who may have been affected to monitor symptoms for seven to 21 days after potential exposure.

Mercury News - The department emphasized that anyone with measles or at risk of developing measles should not attend large gatherings, as measles spreads very rapidly.

Yahoo - California has recorded its highest annual measles count in seven years, with 49 confirmed cases as of June 8, which is the highest since 2019 when 73 cases were reported.

Mercury News - State data shows that 94% of measles cases involve unvaccinated individuals, and more than 80% are in people under 19.

Yahoo - The individual was infectious while passing through San Francisco International Airport and visiting two grocery stores in San Jose.

Yahoo - California has confirmed 49 cases of measles as of June 8, which is nearly double the total recorded in all of 2025.

Mercury News - The measles exposure warning was issued for specific times at the airport and grocery stores.

WHERE:

Yahoo - San Francisco International Airport, including the international terminal, passport control, customs, and baggage claim areas.

Yahoo - Trader Joe’s on Coleman Avenue and International Halal Market on E Santa Clara Street in San Jose.

WHEN:

Yahoo - The individual passed through the airport on Thursday morning between 8:30 a.m. and 11 a.m.

Yahoo - The individual visited Trader Joe’s and International Halal Market on the same day between 8 p.m. and 10 p.m.

Mercury News - The exposure warning was issued for June 8.

WHY:

Yahoo - The Santa Clara County Public Health Department emphasized the importance of vaccination, stating that exposures like this one remind the public of the need for immunization.

Yahoo - The alert was issued due to the contagious nature of measles, which can spread rapidly.

Yahoo - The increase in measles cases in California is driven primarily by international travel.

HOW:

Yahoo - Health officials warned that anyone developing symptoms should contact a medical provider before visiting in person to reduce the risk of further transmission.

Mercury News - The Santa Clara County Public Health Department has issued similar exposure warnings in recent years, including in February 2026 and May 2025.

Yahoo - Health officials are coordinating with the California Department of Public Health and the CDC for contact tracing.

Mercury News - Individuals who may have been exposed are advised to review their immunization records and contact healthcare providers if they are at risk.

(UPDATED June 15, 2026 06:44 UTC)

The Santa Clara County Public Health Department has reported that a staggering 94% of measles cases involve unvaccinated individuals, with over 80% of those cases occurring in people under 19, indicating significant gaps in immunity despite high vaccination rates in the Bay Area. The department is advising anyone who may have been exposed to monitor for symptoms for seven to 21 days and emphasizes that those with measles or at risk should avoid large gatherings, as the disease spreads rapidly. Health officials also urge anyone developing symptoms to contact a medical provider before visiting in person to help reduce the risk of further transmission.

(UPDATED June 15, 2026 01:47 UTC)

California has reported its highest annual measles count in seven years, with 49 confirmed cases as of June 8, marking the most significant outbreak since 2019 when 73 cases were recorded. State data reveals that 94% of these cases involve unvaccinated individuals, with over 80% occurring in people under 19, prompting the Santa Clara County Public Health Department to stress the importance of vaccination. The department has issued similar exposure warnings in recent years, including alerts in February 2026 and May 2025, highlighting the ongoing need for immunization.

(UPDATED June 14, 2026 23:20 UTC)

An adult from Santa Clara County has been diagnosed with measles and was infectious while passing through San Francisco International Airport and visiting two grocery stores in San Jose. The Santa Clara County Public Health Department is actively responding to the situation, which has prompted an exposure warning for specific times at the airport and the grocery stores, including Trader Joe’s and International Halal Market. As of June 8, California has confirmed 49 cases of measles this year, nearly double the total recorded in all of 2025, and health officials are urging anyone who may have been exposed to check their immunization records and contact their healthcare providers.