Most people asking this question have just cleaned out a shed, found droppings in a cupboard, or are caring for someone who is sick. The reassuring part is that hantavirus does not behave like a cold, flu, or COVID-19. With one regional exception, you cannot catch it from another person — you catch it from the environment rodents contaminated.
The rule: rodent-to-human, not human-to-human
Hantaviruses live in wild rodent populations — deer mice in North America, bank voles in northern Europe, brown rats worldwide. Infected rodents shed virus in urine, droppings, and saliva without getting sick themselves. Humans become infected when that dried material is stirred into the air and inhaled. Sin Nombre virus, the main cause of hantavirus pulmonary syndrome in the United States, has never been shown to pass from one person to another in more than three decades of surveillance. The same holds for the Old World strains that cause hemorrhagic fever with renal syndrome.
The exception: Andes virus
Andes virus, which circulates in Argentina and Chile, is the only hantavirus with confirmed person-to-person transmission. Clusters investigated by Argentina's Ministry of Health and PAHO have traced infection to household members, sexual partners, and healthcare workers who had close, prolonged contact with a sick patient — not to casual contact in shops, on transport, or in passing. Contacts are typically monitored for up to six weeks, matching the outer limit of the incubation period. Our Andes virus page covers the documented clusters in detail.
What this means practically
- If a family member has HPS in North America or Europe: you are not at risk from them. You may, however, share the same rodent exposure at home — that is the real thing to address.
- If you were near a confirmed Andes case: contact local public health, note the date of contact, and watch for fever, muscle aches, and shortness of breath for six weeks.
- If you found rodent evidence at home: the risk is airborne particles from the droppings, not other people. Follow the wet-cleaning protocol in our rodent control guide and never sweep or vacuum dry waste.
Common questions
Sources
- U.S. Centers for Disease Control and Prevention — Hantavirus transmission.
- Pan American Health Organization — Andes virus person-to-person transmission.
- Argentina Ministry of Health — hantavirus surveillance guidance.