Bay Area Health News Roundup: June 2026

June brought a wide range of health-related news across the Bay Area, with many of the month’s biggest stories connected to summer travel, large public gatherings and seasonal environmental risks.

One of the most notable developments was a measles exposure warning involving San Francisco International Airport and several San Jose locations. Santa Clara County health officials reported that an adult resident with measles traveled through SFO’s International Terminal and later visited two San Jose businesses while infectious. Officials encouraged anyone who may have been exposed to review their vaccination records, monitor for symptoms and contact a healthcare provider before visiting a medical facility (if symptoms developed).

Other infectious disease concerns also appeared in June. Norovirus remained active in several Bay Area communities, with wastewater monitoring showing elevated levels in Palo Alto, San Jose, Fremont, Vallejo and Novato. Health officials continued to emphasize basic prevention steps, especially frequent hand-washing with soap and water, since hand sanitizer is less effective against norovirus.

Environmental health was another major theme. The Bay Area Air District urged residents to prepare for wildfire smoke during what is expected to be an active fire season in Northern California. Officials recommended signing up for air quality alerts, using effective filtration and wearing a properly fitted N95 mask when outdoor exposure can’t be avoided.

Local public health agencies also focused on seasonal safety. Marin County highlighted tick-borne illness prevention, hot-weather preparedness and an infant formula recall tied to infant botulism concerns. Meanwhile, San Mateo County approved a budget that preserved core services while preparing for potential changes affecting Medi-Cal and CalFresh recipients.