The Complete
Hantavirus Wiki
Symptoms · Transmission · Treatment · Prevention · Outbreak History. Everything you need to understand hantavirus — from the 1993 Four Corners discovery to the 2026 MV Hondius cruise ship cluster.
A multi-country cluster of Andes hantavirus has been confirmed among passengers of the MV Hondius expedition cruise ship. As of May 8, 2026: 8 cases (6 laboratory confirmed), 3 deaths across the Netherlands, South Africa, Germany, and the United Kingdom. WHO issued a global alert on May 4, 2026. The CDC deployed epidemiologists to the Canary Islands as the vessel arrived in Tenerife. This is the first documented multi-country hantavirus cluster linked to person-to-person Andes virus transmission aboard a vessel.
🦠 What Is Hantavirus?
Hantavirus is a family of RNA viruses (genus Hantavirus, family Hantaviridae) that naturally infect wild rodents worldwide. Humans become infected when they inhale microscopic airborne particles — aerosols — from the urine, feces, or saliva of an infected rodent. Unlike most respiratory viruses, hantavirus is not spread by coughing or sneezing between people.
Depending on the strain involved, hantavirus infection causes one of two syndromes. In the Americas, Hantavirus Pulmonary Syndrome (HPS) — also called Hantavirus Cardiopulmonary Syndrome (HCPS) — attacks the lungs and cardiovascular system, with a case fatality rate of 35–40% for the most dangerous North American strain, Sin Nombre virus. In Asia and Europe, Hemorrhagic Fever with Renal Syndrome (HFRS) targets the kidneys and causes approximately 150,000–200,000 hospitalizations globally every year.
The 2026 outbreak aboard the MV Hondius is caused by Andes virus — a South American strain that is unique among all known hantaviruses because it is the only strain capable of spreading from person to person. This property, combined with international travel and a closed-environment cruise ship setting, created an unprecedented public health challenge and triggered a global alert from the World Health Organization on May 4, 2026.
🫁 HPS vs HFRS: Two Diseases, One Virus Family
Understanding which type of hantavirus disease is relevant to you depends almost entirely on geography. If you live in or travel to the Americas, HPS is the primary concern. If you live in or travel to Asia, Korea, China, or rural Europe, HFRS is more relevant.
| Feature | HPS (Americas) | HFRS (Asia/Europe) |
|---|---|---|
| Primary organ affected | Lungs, cardiovascular | Kidneys |
| Main strains | Sin Nombre, Andes | Hantaan, Seoul, Puumala, Dobrava |
| Case fatality rate | 35–40% (SNV) | 0.1–15% (varies by strain) |
| Annual global cases | ~200–400 (Americas) | ~150,000–200,000 |
| Person-to-person | Andes only | None |
| Vaccine available | No | Yes (Korea, China — for HFRS strains) |
🚢 The 2026 Outbreak: Why the World Is Watching
The May 2026 hantavirus outbreak is unprecedented for several reasons. It is the first time Andes virus — the only person-to-person transmissible hantavirus — has been confirmed in a multi-country cluster linked to international travel. It is the first known hantavirus cluster aboard a vessel. And it demonstrates that travelers returning from Patagonia (the endemic zone for Andes virus) can seed cases in countries that have never before managed hantavirus.
Despite the global media attention, infectious disease experts emphasize that the fundamental biology of hantavirus has not changed: it is not efficiently transmitted between humans, it requires prolonged close contact even for Andes virus, and there is no evidence of community spread in any country beyond the immediate vessel contacts.
Read the complete 2026 MV Hondius outbreak report →
🛡️ The 3 Core Prevention Principles
Because no vaccine exists for HPS, prevention is the only reliable protection. Three principles cover the vast majority of real-world risk reduction:
- Never dry-sweep or vacuum rodent droppings. This is the single most dangerous action you can take in a rodent-infested space. Always wet the droppings with a 1:10 bleach solution before removing them. See the complete cleaning protocol →
- Wear an N95 respirator (not a cloth mask) when entering any space with signs of rodent activity — cabins, sheds, barns, or any enclosed space that has been closed for an extended period.
- Seal rodent entry points. Mice can enter through gaps as small as ¼ inch (6mm). Steel wool, hardware cloth, and caulk are effective. Eliminating the source of exposure is the most durable prevention strategy.
📺 Hantavirus Explained: Video Guides
Selected expert explanations of the 2026 outbreak and hantavirus basics.
📚 Complete Hantavirus Reference
Early signs, incubation period, HPS phases, when to go to the ER
How hantavirus spreads, which rodents carry it, and person-to-person Andes risk
ICU care, ECMO survival rates, medications, and vaccine pipeline
ELISA testing, PCR, the 5-point clinical screen, blood test results
10-step cleaning protocol, camping guide, home rodent-proofing
Sin Nombre, Andes, Seoul, Puumala, Hantaan, Dobrava — full profiles
2026 MV Hondius, 1993 Four Corners, 2012 Yosemite, Americas data
US states by case count, global endemic regions, seasonal patterns
Every hantavirus question answered — transmission, symptoms, pets, pandemic risk
Hantavirus FAQ: Most Asked Questions
What is hantavirus and how do you get it?
Hantavirus is a rodent-borne RNA virus transmitted primarily by inhaling aerosolized particles from infected rodent urine, feces, or saliva. In North America, the deer mouse is the main carrier of Sin Nombre virus, the leading cause of Hantavirus Pulmonary Syndrome (HPS). Andes virus — responsible for the 2026 cruise ship outbreak — is the only strain that can also spread person-to-person through close contact.
Is hantavirus contagious between people?
Almost all hantavirus strains, including Sin Nombre virus in North America, are NOT contagious between people. The sole exception is Andes virus (South America), which can spread through prolonged close contact. The 2026 MV Hondius cruise ship cluster involved Andes virus person-to-person transmission.
What are the first signs of hantavirus?
Early hantavirus symptoms include sudden high fever, severe muscle aches (especially in the thighs and lower back), intense headache, fatigue, and often nausea or diarrhea. Unlike flu, hantavirus does NOT cause sore throat or runny nose. After 3–5 days, some patients rapidly develop a dry cough and life-threatening breathing difficulty.
Should I be worried about the 2026 hantavirus outbreak?
Unless you were aboard the MV Hondius cruise ship between March 20 and May 8, 2026, your risk from this specific outbreak is extremely low. WHO assessed global public risk as 'very low.' However, hantavirus is present year-round in rodent populations across western North America and other endemic regions, so general prevention awareness is always worthwhile.
Is there a hantavirus vaccine or cure?
No vaccine is available for HPS-causing hantaviruses (Sin Nombre, Andes) in 2026. Vaccines for Old World HFRS strains exist in South Korea and China. There is no specific antiviral cure for HPS — treatment is intensive supportive care in an ICU, with ECMO used in the most severe cases.