Hantavirus outbreak on cruise ship took nearly a month to identify after first death

A 70-year-old Dutch man woke on April 6 with fever, headache, and mild stomach trouble aboard the MV Hondius, an expedition cruise ship cutting through the South Atlantic between Argentina and Antarctica. Five days later, he was dead—respiratory distress taking him as the ship drifted between South Georgia and St. Helena. No one knew why. The cruise operator, Oceanwide Expeditions, could not determine the cause. The ship sailed on.

The MV Hondius is not a typical floating resort. It is built for expedition travel to the world's remotest places—Antarctica, isolated South Atlantic islands, the kind of destinations most people will never see. These cruises run a month or longer and cost between $6,000 and $25,000 per cabin. On April 1, the ship departed southern Argentina with roughly 150 passengers and crew from 23 nations aboard. The voyage was meant to be transformative. Instead, it became a slow-moving medical catastrophe.

When the Dutch man's body was offloaded at St. Helena on April 24, his 69-year-old wife disembarked with him. She was already symptomatic. During the flight to South Africa the next day, she collapsed at the airport. She died in a hospital on April 26. A British passenger who had fallen ill after the ship left St. Helena—high fever, shortness of breath, pneumonia—was evacuated from Ascension Island on April 27 and admitted to intensive care in South Africa. A German woman fell ill after the ship set sail again, this time toward Cape Verde. She died four days later, her body still aboard when the outbreak became public knowledge. Three dead. One critically ill. Three more showing symptoms and waiting for evacuation. The virus remained unnamed.

It took 21 days for anyone to know what was killing people. South African health officials, after exhausting other possibilities, tested the British man in intensive care for hantavirus—a rare rodent-borne pathogen that most doctors do not encounter in their careers. The test came back positive on Saturday. The next day, the WHO announced it was investigating a suspected outbreak. On Monday, posthumous testing of the Dutch woman's body confirmed hantavirus. The virus had been aboard the ship the entire time, moving through the vessel as it crossed thousands of miles of ocean, stopping at remote islands, carrying its passengers toward destinations they would never reach.

Hantavirus is not a single disease but a family of viruses carried by rodents. Infection happens through exposure to infected animal saliva, urine, or droppings. Person-to-person transmission is rare, though health officials acknowledge it may be possible. How the virus boarded the MV Hondius remains under investigation. The Dutch couple had traveled through Argentina and elsewhere in South America before embarking. Whether they contracted it on land or whether contaminated material somehow made its way into the ship's systems, no one yet knows.

The ship is now off the West African coast, headed toward Spain's Canary Islands. Passengers and crew are isolated in their cabins with maximum physical distancing—a lockdown that echoes the pandemic protocols of recent years. Aircraft were being dispatched to Cape Verde to evacuate the two most critically ill passengers and one person who had been traveling with the German woman. They would be flown to the Netherlands, though no arrival timeline was confirmed. Spanish authorities said they were monitoring the situation but had not yet confirmed the ship's arrival plans. The investigation into the source of infection continues, as does the slow, careful work of moving 150 people from a ship that became, unexpectedly, a vessel of contagion.