Seven Cases, Three Dead: What We Know About The Hantavirus Outbreak On A Cruise Ship Off Cape Verde

A luxury expedition cruise that left Argentina last month has turned into one of the most alarming public health events of 2026. The MV Hondius, operated by Dutch tour company Oceanwide Expeditions, departed from Ushuaia in southern Argentina on April 1 carrying 147 passengers and crew from 23 different nationalities, including 17 Americans. What was supposed to be a remote Atlantic Ocean adventure has become something nobody on board signed up for. Three people are dead, one person is fighting for their life in a Johannesburg hospital, and the ship is anchored off the coast of Cape Verde with no port willing to let it dock.

The World Health Organization confirmed on Monday that seven cases have now been identified, two of them laboratory confirmed as hantavirus and five more suspected. The WHO said illness onset among those affected occurred between April 6 and April 28, with symptoms that included fever, gastrointestinal distress, rapid progression to pneumonia, acute respiratory distress syndrome and shock. For a virus that most people have never thought about, it moved through this ship with terrifying speed.

The first victim was a 70-year-old Dutch man who fell sick on April 6 with fever, headache and stomach pain. By April 11 he was dead, right there on the ship. His body was removed when the vessel stopped at Saint Helena, a remote British overseas territory in the South Atlantic. His wife, a 69-year-old Dutch woman who had been travelling with him, disembarked at Saint Helena showing gastrointestinal symptoms. She deteriorated rapidly on a flight to Johannesburg and died at the emergency department upon arrival on April 26. She later tested positive for hantavirus. The third death was reported on May 2, when a woman on board developed pneumonia-like symptoms starting April 28 and died days later.

A British national who fell sick on April 27 was medically evacuated and is currently in intensive care at a private facility in Johannesburg, in critical condition. Two crew members, one British and one Dutch, have been reported as experiencing acute respiratory symptoms requiring urgent care on board. Dutch authorities were preparing to evacuate both symptomatic crew members using specialized aircraft fitted with medical equipment. The ship at the time of writing carries 88 passengers and 59 crew members, all living under strict isolation measures, hygiene protocols and medical monitoring.

Cape Verde refused the ship permission to dock at the port of Praia, citing the need to protect public health on the islands. Oceanwide Expeditions said the vessel may proceed to Las Palmas or Tenerife in the Spanish Canary Islands, where WHO and Dutch health services could organize and supervise further medical screening. The situation has left passengers stranded in a floating limbo, uncertain of where they are going or when this ends. Travel blogger Jake Rosmarin, who was among those still on board, posted an emotional video asking for understanding from the public. "What's happening right now is very real for all of us here. We're not just a story. We're not just headlines. We're people, people with families, with lives, with people waiting for us at home," he said.

So what exactly is hantavirus and why is it causing this much damage? Hantavirus is a family of viruses carried by rodents and transmitted to humans primarily through contact with infected urine, droppings or saliva. The most common route of infection is breathing in airborne particles from dried rodent droppings, especially in enclosed or poorly ventilated spaces. It is not a new virus. Studies indicate hantaviruses have been around for centuries, with outbreaks documented in Asia and Europe. Worldwide, between 150,000 and 200,000 cases are identified every year, though most of those go unreported in mainstream news because they happen in rural or remote communities.

The virus causes two main types of illness. In the Americas, it causes hantavirus pulmonary syndrome, which attacks the lungs and can be fatal in up to 35 to 40 percent of cases. In Europe and Asia, it causes haemorrhagic fever with renal syndrome, which attacks the kidneys. Symptoms early on can consist of fever, chills, muscle pain and headache, which makes it incredibly difficult to diagnose quickly because those are the same symptoms you get from the flu. By the time doctors figure out what they are dealing with, the virus has often already progressed into something much more dangerous.

There is no cure and no specific treatment. Patients receive supportive care, meaning doctors manage symptoms with oxygen therapy, mechanical ventilation and in severe cases, dialysis, and hope the body fights it off. Early medical attention significantly improves the chances of survival, which is why every hour matters once symptoms appear.

What makes this outbreak so puzzling to scientists is the how. Hantavirus is not supposed to spread easily between people. Almost every known case involves direct exposure to infected rodents or their droppings. Only one hantavirus, the Andes strain native to South America, is known to have spread from person to person, and this is rare. The WHO has not yet determined whether passengers had contact with wildlife during the trip or before boarding. Argentina's Tierra del Fuego province, where the ship departed from, says it has never recorded a hantavirus case. However, hantavirus is endemic in other parts of Argentina and Chile, and in late 2018 and early 2019, a town in Patagonia experienced dozens of infections.

Whether someone brought the virus on board already infected, whether there was a rodent on the ship, or whether something else entirely is at play, nobody has officially confirmed yet. Investigations involving serology, genome sequencing and metagenomics are ongoing. Five countries are now coordinating the response including Cape Verde, the Netherlands, Spain, South Africa and the United Kingdom.

For context, hantavirus gained renewed global attention in 2025 when Betsy Arakawa, wife of Hollywood actor Gene Hackman, died from the infection at their home in New Mexico. Hackman died around a week later from heart disease. That case reminded the world that this virus does not only affect people in remote locations or developing countries. It can reach anyone who crosses paths with an infected rodent.

The WHO has stressed that the overall risk to the global population from this outbreak remains low. Hantavirus does not spread through casual contact, it is not airborne in the traditional sense and it does not move from city to city the way a respiratory virus can. But for the nearly 150 people still on that ship, watching their fellow passengers get airlifted off one by one and waiting for news of who is next, the global risk assessment offers very little comfort right now.