California Faces Rising HMPV: No Vaccine, What Doctors Warn

Wastewater data show high levels of human metapneumovirus (HMPV) across Northern California, with Redwood City reporting the strongest signals, as national cases rise since October 2025. HMPV typically causes cold-like symptoms but can lead to middle-ear infections and life-threatening asthma; there is no vaccine, and diagnosis requires lab testing. Most people recover with rest and fluids, while severe cases may need hospitalization. Preventive steps include good hand hygiene, cleaning surfaces, and staying home when sick.