Is Hantavirus Contagious? — Strain-by-Strain Answer
The short answer: only Andes virus is contagious between people, and only via close household contact. All other hantaviruses — Sin Nombre, Puumala, Hantaan, Seoul, Dobrava-Belgrade — are caught from rodents, never from another infected person.
Quick answer table
| Hantavirus strain | Contagious between people? | Main transmission |
|---|---|---|
| Andes virus (ANDV) | Yes (close household contact) | Rodents + person-to-person |
| Sin Nombre (SNV) | No | Rodent aerosol only |
| Puumala (PUUV) | No | Rodent aerosol only |
| Hantaan (HTNV) | No | Rodent aerosol only |
| Seoul (SEOV) | No | Rodent aerosol only |
| Dobrava-Belgrade (DOBV) | No | Rodent aerosol only |
Why is Andes virus the exception?
Andes virus is the only orthohantavirus with documented and reproducible person-to-person transmission. The biological basis is not fully resolved but appears to involve structural differences in the ANDV glycoproteins (Gn and Gc) that allow higher viral replication in respiratory tissue, producing more infectious aerosols and respiratory droplets during the acute illness.
The 1996 El Bolsón outbreak in Argentine Patagonia first established person-to-person transmission as a feature of ANDV. The 2018-2019 Epuyén outbreak — also in Argentine Patagonia — included 34 cases with clear secondary chains, leading to international updates in clinical guidance. The 2026 MV Hondius cluster has prompted further refinement of contact tracing protocols by UKHSA, ECDC, and RIVM.
Andes virus secondary attack rate
Cohort data from the Argentine and Chilean outbreaks indicate the secondary attack rate (probability that a household close contact develops disease) for Andes virus is approximately:
- 5-10% in close household contacts.
- Higher (up to 15-20%) in sexual partners and primary caregivers.
- Lower (less than 1%) in non-household close contacts (e.g. co-workers, classmates).
- Negligible in casual contacts.
Practical implications for ANDV contacts
If you have been a close contact of a person with confirmed or suspected Andes virus disease, current national public-health guidance (UKHSA, ECDC, Chilean Ministry of Health) is:
- Self-monitor for fever and respiratory symptoms for 45 days from the last close contact.
- Self-isolate from vulnerable people (children, elderly, immunocompromised) until cleared by public-health follow-up.
- Routine social contact outside the household does not need to be restricted while asymptomatic.
- If you develop fever OR any respiratory symptom, contact your national health service immediately and mention ANDV exposure explicitly.
What about coughing or sneezing?
For Andes virus, respiratory droplets are part of the transmission picture, particularly during the cardiopulmonary phase. For all other hantaviruses, respiratory droplets from an infected person play no role — the patient is not contagious in any clinically meaningful way.
Healthcare worker precautions
For confirmed or suspected ANDV-HPS patients:
- Standard precautions PLUS droplet and contact precautions.
- FFP3 (UK/EU) or N95 (US/CA) respirator, eye protection, gowns, and gloves.
- Negative-pressure isolation where available.
- Designated patient-care equipment to limit cross-contamination.
For all other hantaviruses, standard precautions are sufficient. No healthcare worker transmission has been documented for SNV, PUUV, HTNV, SEOV, or DOBV.
What is NOT a hantavirus transmission route
Despite persistent misinformation, hantavirus is NOT transmitted by: mosquito or tick bites; domestic pets (with the rare Seoul virus exception); air conditioning or HVAC systems; sexual contact (separate from the general close-household ANDV route); blood donation; public water supplies; or casual social contact such as shaking hands, sharing a meal, or sitting near someone in public.
For the full transmission inventory, see the main hantavirus transmission page →
Open the live hantavirus outbreak map →
Frequently asked questions
Is hantavirus contagious between people?
With one exception, hantaviruses do not transmit between people. The exception is Andes virus (ANDV), which has documented person-to-person transmission via close household contact during the acute illness. Sin Nombre, Puumala, Hantaan, Seoul, and Dobrava-Belgrade are rodent-to-human only.
How do you catch hantavirus?
Inhaling dust contaminated with rodent urine, faeces, or saliva is the dominant route (over 95% of cases). This typically happens in enclosed spaces when contaminated dust is disturbed by sweeping, vacuuming without HEPA, or moving stored items. Direct rodent bites and contaminated food/water are minor secondary routes.
Why is Andes virus the only contagious hantavirus?
Andes virus has structural differences in its glycoproteins that allow higher replication in respiratory tissue compared to other hantaviruses. This produces more infectious respiratory droplets during acute illness, enabling household transmission. Multiple Argentine and Chilean outbreaks have documented clear secondary case chains.
Can a hantavirus patient infect their family?
For Andes virus, yes — household secondary attack rate is approximately 5-10% in close-contact household members. For all other hantaviruses, no. Household contacts of confirmed ANDV patients should self-isolate from vulnerable people (children, elderly, immunocompromised) and follow public-health guidance.
How long is a hantavirus patient contagious?
For Andes virus, infectiousness peaks during the acute prodromal and cardiopulmonary phases (roughly days 5-14 from symptom onset). Asymptomatic shedding before or after this window has not been clearly documented as a transmission source. For other hantaviruses, the question doesn't apply — they don't transmit between people.
Can healthcare workers catch hantavirus from patients?
For Andes virus, yes — healthcare worker secondary cases have been documented, prompting standard droplet + contact precautions, FFP3/N95 respirator use, and where possible negative-pressure isolation. For all other hantaviruses, no occupational transmission from patients has been documented.
Is hantavirus airborne like measles or COVID-19?
Hantavirus is not airborne in the epidemiological sense of measles or pulmonary tuberculosis — it does not float in room air or travel between rooms via HVAC. It IS aerosolised by mechanical disturbance of contaminated dust, producing a short-range aerosol. Practical implication: a room with dried rodent excreta becomes hazardous when the dust is disturbed.
Can pets transmit hantavirus to humans?
Pet dogs, cats, hamsters, guinea pigs, and rabbits do not carry hantavirus under normal circumstances. The only documented exception is pet brown rats (and rarely pet hamsters) exposed to wild brown rats carrying Seoul virus — extremely rare, documented mainly among rat-breeder communities in the UK and US.
Can you get hantavirus from a mosquito or tick bite?
No. Hantaviruses are not arthropod-borne. Mosquitoes, ticks, fleas, and midges do not carry or transmit hantavirus. Other rodent-associated diseases (e.g. Lyme disease, plague) involve arthropod vectors, but hantavirus is strictly an aerosol/contact pathogen via rodent excreta.
Is the MV Hondius hantavirus outbreak contagious between passengers?
The MV Hondius cluster is Andes virus — which CAN transmit between people via close household contact. Whether passenger-to-passenger transmission occurred aboard the ship versus all cases arising from the original Tierra del Fuego exposure is still under investigation by WHO and the involved national authorities. Cabin-mate clusters suggest some secondary transmission did occur.