Aedes aegypti — a bottle‑cap‑breeding, day‑biting mosquito that can spread dengue and Zika — has been detected in parts of the Bay Area; officials urge residents to clear standing water.

Santa Clara County confirmed a measles case in an adult who recently traveled abroad; officials say the vaccinated patient is isolating and urged residents to check MMR status.

A larger second flu peak has hit Sonoma and Napa counties as H3N2 and rising wastewater signals push test positivity and hospital visits higher. Health officials urge vaccination and early treatment.