Hantavirus: What Travellers Need to Know

Unless you've been completely offline this week, you've probably seen the headlines about a cruise ship outbreak that's left three passengers dead, and health organisations scrambling. Hantavirus is suddenly front-page news, and understandably, a lot of travellers are asking the same question: should I be worried?

The short answer: it depends where you're going. Here's what the noise is actually about, and what it means if you're backpacking through Southeast Asia, or travelling around Europe.

What Happened:

A small group of passengers aboard a cruise ship were reported to the World Health Organization on 2nd May, 2026 with severe respiratory illness. As of 4th May, seven cases had been identified including three deaths, with illness characterised by fever, gastrointestinal symptoms and rapid progression to pneumonia. Source: WHO

The ship in question, the MV Hondius, departed Argentina on 1st April, on an Atlantic voyage taking in Antarctica, the Falkland Islands and other remote locations. Source: Euronews

WHO infectious disease epidemiologist Maria Van Kerkhove was direct: "This is not SARS-CoV-2. This is not the start of a Covid pandemic. This is an outbreak that we see on a ship." The hantavirus involved is a South American strain. The risk to the general population in Europe from this particular outbreak is considered very low. European Centre for Disease Prevention and Control

So, not the next pandemic. But hantavirus itself is worth understanding, especially if you travel in rural areas.

What Is Hantavirus?

Hantaviruses are viruses that naturally infect rodents and are occasionally transmitted to humans. Infection can result in severe illness and often death, although the diseases vary by type of virus and geographical location.

In the Americas: Hantavirus causes a lung-focused condition with a fatality rate that can reach 50%. That's what the cruise ship outbreak involves.

In Europe and Asia: Hantaviruses cause haemorrhagic fever with renal syndrome (HFRS), which primarily affects the kidneys and blood vessels. The case fatality rate is under 1 to 15% in Asia, and Europe, substantially lower than the American variants. According to WHO

The Risk in Asia:

In East Asia, particularly China and the Republic of Korea, HFRS continues to account for many thousands of cases annually, although incidence has declined in recent decades. WHO

The most prevalent strains in Asia are the Hantaan virus, carried by the striped field mouse, and the Seoul virus, carried by the common rat. Both cause the kidney-targeting HFRS form rather than the lung form seen in the Americas. The Asian Affairs

For backpackers in Southeast Asia, the main risk scenarios are rural guesthouses with rodent activity, trekking in forested or agricultural areas, and staying in or cleaning any building that's been closed up for a while. Rice paddies, jungle camps, and older rural accommodation are the environments worth being mindful of.

Human-to-human transmission has not been documented in Asia. You cannot catch it from another traveller at your hostel. WHO

The Risk in Europe:

In Europe, several thousand cases are reported each year, mainly from northern and central regions where Puumala virus circulates. In 2023, 1,885 hantavirus infections were reported in the European Region, the lowest rate recorded between 2019 and 2023. WHOWHO

Scandinavia, the Baltic states, parts of Germany, and rural central Europe see the highest rates. The bank vole is the primary carrier for the European Puumala strain. If you're hiking through forest cabins in Finland or staying in rural accommodation in central Europe, this is more relevant than it would be in a city hostel in Barcelona.

As with Asia, human-to-human transmission has not been documented in Europe. WHO

The Risk in South America:

This is where the current outbreak originated, and it's relevant for anyone doing the Patagonia circuit, the Inca Trail, or a South America overland route.

The Andes virus is the most common cause of hantavirus pulmonary syndrome in South America, predominantly occurring in Argentina, Brazil, and Chile. The case fatality rate from Andes virus infection is around 40%. In Argentina, 100 to 200 cases occur each year.

Although hantavirus cases were once limited to the southern reaches of Patagonia, Argentina's Health Ministry now reports that 83% of cases are found in the country's far north. Climate change is a factor. Higher temperatures are expanding the virus's range as warming ecosystems allow the rodents that carry hantavirus to thrive in new areas.

The highest-risk areas for trekkers are Torres del Paine and the Argentine Lake District, which fall within or adjacent to the endemic range. The Machu Picchu region of Peru sits at the lower end of documented incidence, but hantavirus in Peru is real and lower risk does not mean zero risk.

The key distinction with South America is transmission. The Andes virus is the only currently known hantavirus for which limited human-to-human transmission has been documented, primarily in Argentina and Chile. This doesn't mean casual contact is dangerous. When human-to-human transmission has occurred, it has been associated with close and prolonged contact, particularly among household members or intimate partners, and appears most likely during the early phase of illness.

Because early symptoms can resemble the fever and chills of flu, you might think you just have a cold and not take it seriously. That is what makes it particularly dangerous.

How You Actually Get It:

Transmission happens through contact with contaminated urine, droppings or saliva of infected rodents. Activities that involve contact with rodents such as cleaning enclosed or poorly ventilated spaces, farming, forestry work and sleeping in rodent-infested dwellings all increase exposure risk.

Early symptoms typically include fever, headache, muscle aches and gastrointestinal symptoms such as abdominal pain, nausea or vomiting. Early diagnosis can be challenging because initial symptoms are common with other illnesses such as influenza, COVID-19, dengue or leptospirosis. If you've been in a high-risk environment and develop these symptoms, tell a doctor exactly where you've been and what you may have been exposed to.

What You Should Do:

The good news is that most routine tourism activities carry little or no risk of exposure to rodents or their excreta. You are not going to catch hantavirus at a rooftop bar in Chiang Mai.

The practical steps that matter though:

In South America specifically: If you're visiting rural areas, camping or hiking in regions where Andes virus is endemic, take precautions to reduce your potential exposure to rodent excreta. Stick to established campsites where possible, and avoid sleeping directly on the ground in forested areas without proper groundsheet protection.

Accommodation: Avoid rooms with obvious signs of rodent activity: droppings, gnaw marks, holes in walls or floors. If you're camping or staying in a rural bungalow, keep food sealed and stored off the floor.

Cleaning: Do not sweep or vacuum rodent droppings, as this spreads the virus. Instead, wet the area with a bleach and water solution, allow it to sit, then wipe with a paper towel. Wear a mask and gloves if you need to clean a space with signs of rodent presence. WHO

Ventilation: If you're entering a space that's been closed for a long time, open windows and let it air out before spending time in it.

Food: Keep all food, including snacks and anything in your pack, in sealed containers. Rodents can squeeze through surprisingly small gaps. The Asian Affairs

Seek care early: There is no vaccine and no specific antiviral for hantavirus. Early supportive care and access to a facility with a complete ICU can significantly improve survival outcomes. If you've been in rural or forested areas and develop fever, severe muscle pain and any kidney or respiratory symptoms, get to a hospital and give them your full travel history. WHO

Stay aware, not anxious:

Hantavirus is not something most travellers need to panic about. The cruise ship outbreak dominating headlines involves a South American strain far more lethal than anything circulating in Europe or Asia, and it appears linked to a specific rodent exposure before passengers even boarded.

That said, if you're trekking in Patagonia, camping in rural Argentina or Chile, hiking through Scandinavian forest cabins, or staying in older agricultural guesthouses in Vietnam or Cambodia, it's a legitimate virus to be aware of. The prevention steps are simple, and the risk drops significantly when you know what to avoid.