Hantavirus cases in California, USA
Live, source-cited map of every documented hantavirus outbreak from 1993 to 2026. Curated from WHO, CDC, ECDC, PAHO, and peer-reviewed literature.
Open the live map focused on California →This page tracks every documented hantavirus outbreak in the U.S. state of California from 1993 to the present. Each event is verified against the CDC NNDSS, MMWR reports, the state department of health, and peer-reviewed literature before publication.
The dominant hantavirus species in the United States are Sin Nombre virus (the index species of the 1993 Four Corners outbreak), Bayou virus, Black Creek Canal virus, and Seoul virus. Click any marker for source-cited detail.
Recent activity
How we verify data
Every event entry is constructed from verbatim quotes in primary sources. We do not estimate; where a numeric claim cannot be verified against an open-access tier-1 source, we record zero. Tier-1 sources: WHO, CDC, ECDC, PAHO, national health ministries. Tier-2: ProMED-mail, CIDRAP, peer-reviewed papers. Tier-3 (queues for manual review): major science journalism (Reuters, AP, BBC).
Hantavirus species at a glance
Hantavirus is a family of rodent-borne RNA viruses (Hantaviridae). The clinically important species split between Hantavirus Pulmonary Syndrome (Andes, Sin Nombre, Bayou, Black Creek Canal, Choclo, Laguna Negra) and Hemorrhagic Fever with Renal Syndrome (Hantaan, Puumala, Seoul, Dobrava). Case-fatality varies dramatically by species — from <0.5 % for Puumala to ~30–40 % for Andes and Sin Nombre.