A Rare Virus on a Cruise Ship Has Put Hantavirus Back in Focus. Here’s What It Means

Hantavirus is a rodent-borne virus that usually spreads when people breathe in dust contaminated with urine, droppings or saliva from infected rodents. In May 2026, it came into focus after a cruise ship-linked cluster involving the Andes strain, which can rarely spread between people through close and prolonged contact. There is no specific cure or vaccine, but early hospital care can help manage severe symptoms.

Quick Summary — Key Facts at a Glance

• Virus: Hantavirus — Andes strain
• Ship: MV Hondius, Dutch-flagged expedition vessel
• Departure: Ushuaia, Argentina — April 1, 2026
• Cases as of May 7, 2026: 8 confirmed or suspected
• Deaths: 3
• Countries affected: South Africa, Netherlands, Germany, UK, Switzerland, Spain
• Human-to-human spread: Yes, but only through very close physical contact
• Treatment: No specific antiviral — ICU and supportive care only
• Vaccine: None available
• Global risk: Low (WHO assessment)
• Where the ship is headed: Tenerife, Canary Islands, Spain

Current status as of 7 May 2026

• A hantavirus-linked cluster is under investigation on a South Atlantic cruise ship.
• The ship had passengers and crew from 23 nationalities.
• Three deaths have been reported in the official ECDC assessment.
• At least two samples tested positive for hantavirus by PCR, and one additional sample tested positive for Andes virus.
• Health agencies are investigating whether exposure happened in Argentina before boarding, through environmental exposure or through rare close-contact transmission on board.
• WHO says global risk is low.
• ECDC says the risk to the general population in Europe is very low.
• CDC is monitoring some US travellers linked to the ship, with no symptoms reported among those mentioned in the Reuters update. 

The MV Hondius, a ship owned by a Dutch company called Oceanwide Expeditions, left Ushuaia in southern Argentina on April 1, 2026. The ship was on a remote journey across the South Atlantic, stopping at Antarctica, South Georgia, Tristan da Cunha, Saint Helena, and Ascension Island before heading toward the Canary Islands.

On April 11, 2026, a 70-year-old Dutch man died on board. His cause of death was not immediately clear. His body stayed on the ship for nearly two weeks before it was taken off at Saint Helena.

His wife also left the ship at Saint Helena. She boarded a flight to Johannesburg, South Africa, fell very ill mid-flight, and died at the emergency department on April 26. She was later confirmed to have hantavirus.

Around the same time, a British passenger caught fever, breathlessness, and pneumonia symptoms. He was airlifted from Ascension Island to South Africa and admitted to an ICU. He was also confirmed positive.

On May 2, a German woman died on the ship.

By May 4, the World Health Organization had been formally notified. Seven cases were on record — two confirmed by laboratory testing, five suspected. Three people were dead.

By May 6, the count had risen to eight cases. The Andes strain was officially confirmed. Three infected passengers were evacuated by air ambulance — a 56-year-old British national, a 41-year-old Dutch national, and a 65-year-old German — and flown to the Netherlands for treatment.

On the same day, a man who had traveled on an earlier leg of the same ship's journey was found to be infected in Zurich, Switzerland, after returning home by flight. This was the first case directly linked to the ship that had spread back to mainland Europe.

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What is Hantavirus?

Hantavirus is not a new virus. It is also not a virus that spreads like flu, COVID-19 or measles. Most people get infected when they breathe in dust contaminated with urine, droppings or saliva from infected rodents. This is why hantavirus is usually linked to cabins, farms, forests, storerooms, sheds, poorly ventilated rooms and places where rodents live unnoticed. The World Health Organization says hantaviruses are carried by rodents and can cause severe disease in humans, including lung and kidney-related illness.

What are The Symptoms of Hantavirus?

Hantavirus can start like many ordinary infections. That is why it can be missed in the early stage.

Common early symptoms may include:

• Fever
• Headache
• Chills
• Muscle pain
• Tiredness
• Nausea
• Vomiting
• Diarrhoea
• Stomach pain

In severe cases, especially in the Americas, hantavirus can progress to hantavirus pulmonary syndrome. This means the lungs and heart can be affected. People may develop cough, breathing difficulty, fluid in the lungs, low blood pressure and shock. WHO says symptoms usually begin between one and eight weeks after exposure.

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How Does Hantavirus Spread?

The usual route is simple but often ignored: rodent contamination.

A person can get infected when:

• They breathe in dust from dried rodent urine, droppings or saliva
• They clean a rodent-infested space without proper precautions
• Rodent waste touches broken skin, eyes, nose or mouth
• They are bitten by an infected rodent, though this is less common

CDC says hantavirus mainly spreads from rodents to people, especially when fresh urine, droppings or nesting material is stirred up and contaminated particles enter the air. 

Person-to-person spread is not common. For most hantaviruses, it is not documented. The Andes virus is the known exception, but even there, spread usually needs close and prolonged contact. 

Is There a Cure for Hantavirus?

There is no specific licensed antiviral treatment or vaccine for hantavirus infection, according to WHO. Treatment is supportive. That means doctors treat the complications and help the body survive the illness. 

Supportive care may include:

• Oxygen support
• Fluids under medical supervision
• Monitoring blood pressure
• ICU care in severe cases
• Kidney support if kidney-related disease develops
• Breathing support if the lungs are affected

CDC also says there is no specific treatment for hantavirus infection and that patients should receive supportive care, including hydration and treatment of symptoms. Severe lung disease may require breathing support. 

The most important point is timing. Early medical care improves the chance of survival, especially when breathing problems begin.

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The Andes Virus — Why This One Is Different

Out of all the hantavirus strains that exist, the Andes virus is the one that scientists watch most carefully. Here is why:

It spreads between people. Every other hantavirus strain only spreads from rodent to human. The Andes strain can go from human to human, but only through very close, prolonged physical contact. The WHO was clear about this: sharing a cabin, a bunk room, or providing direct medical care are the kinds of situations where it can spread. It is not airborne in the way COVID-19 or influenza is.

It is deadly. The case fatality rate for the Andes virus sits at roughly 40 percent. That means out of every 10 people who get seriously ill from it, roughly 4 do not survive. This is not a virus you want to ignore.

It is found in South America. The Andes virus is primarily found in Argentina and Chile. The two passengers who appear to have been the starting point of this outbreak had traveled through Argentina before boarding the ship on April 1.

No rodents have been found on the MV Hondius. The most likely explanation from health officials is that the virus was carried onto the ship by a passenger who had been exposed in Argentina before boarding.

Symptoms — What to Watch For

Early stage (Days 1–5):

• High fever
• Muscle aches, especially in the thighs, hips, and back
• Headache
• Fatigue
• Stomach symptoms — nausea, vomiting, diarrhea

This early stage looks like the flu. That is the problem. Many people do not suspect anything serious at this point.

Later stage (Days 5 onwards):

• Cough
• Shortness of breath
• Chest tightness
• Rapid progression to pneumonia
• Acute respiratory distress syndrome (the lungs begin to fill with fluid)
• Shock

Once a patient reaches the later stage, it can deteriorate within hours. Several of the MV Hondius patients went from mild symptoms to critical condition in a matter of days.

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Which Countries Are at Risk Right Now?

Because the MV Hondius had passengers from more than 20 countries, health agencies across multiple continents have been activated. Here is where things stand:

• South Africa — Two passengers were evacuated and treated here. Lab confirmation of hantavirus was done here first.
• United Kingdom — The UK's IHR focal point first notified the WHO on May 2.
• Netherlands — The ship is Dutch-flagged. Three infected passengers were flown to the Netherlands on May 6.
• Germany — One of the confirmed cases was a German national.
• Switzerland — A man who sailed on an earlier leg of the trip tested positive in Zurich on May 6.
• Spain (Canary Islands) — The ship is heading to Tenerife for passenger disembarkation.
• Cape Verde — The ship was anchored off Praia before authorities there refused to authorize docking.
• Canada — Four Canadian citizens were on board. Canada's Foreign Affairs Minister confirmed consular staff would be at the port in Tenerife.

Bottom line

Hantavirus is serious, but it is not easy to catch in normal public settings. The main risk remains contact with infected rodents or their waste. The current cruise ship outbreak needs investigation because the Andes virus can rarely spread between people after close and prolonged contact. For most readers, the useful takeaway is simple: control rodents, clean safely, avoid breathing contaminated dust and take fever plus breathing difficulty seriously after possible exposure.

Source: Reuters, WHO, ECDC, AP News

FAQs

What is hantavirus?

Hantavirus is a virus carried by rodents. Humans usually get infected when they breathe in dust contaminated with urine, droppings or saliva from infected rodents.

Is hantavirus spreading in 2026?

The major May 2026 update is linked to a cruise ship cluster involving the Andes strain. Health agencies are investigating the source and monitoring close contacts.

Can hantavirus spread from person to person?

Most hantavirus strains do not spread from person to person. The Andes strain is an exception and can rarely spread through close and prolonged physical contact.

What are the first symptoms of hantavirus?

Early symptoms may include fever, headache, muscle pain, tiredness, nausea, vomiting, diarrhoea and stomach pain.

What are severe symptoms of hantavirus?

Severe symptoms may include cough, breathing difficulty, pneumonia, low blood pressure, shock and respiratory distress.

Is there a cure for hantavirus?

There is no specific antiviral cure or vaccine. Treatment is supportive and may include oxygen, fluids, ICU care and breathing support.

How can hantavirus be prevented?

Avoid contact with rodent urine, droppings and nesting material. Do not sweep dry droppings. Ventilate rooms, wet contaminated areas before cleaning and wear gloves.