It began as a dream voyage a 33-night polar odyssey through some of the most remote and spectacular waters on earth. Antarctica. The Falklands. South Georgia. Saint Helena. By the time the MV Hondius anchored off Praia, the capital of Cape Verde, on Sunday, it had become something else entirely: a sealed vessel carrying three dead passengers, a critically ill British national in a Johannesburg intensive care unit, and nearly 150 people from 23 countries who could not leave and did not know what was killing their fellow travellers.
The World Health Organization confirmed on Monday that as of May 4, seven cases of hantavirus have been identified following a suspected outbreak on the luxury cruise ship, which was carrying mostly British, American and Spanish passengers. Two infections have been confirmed through laboratory testing, while five are suspected cases. Three people have died and one patient remains critically ill.
The ship the Dutch-flagged MV Hondius, operated by Netherlands-based Oceanwide Expeditions had set out from Ushuaia in southern Argentina over a month ago, marketed as an Antarctic nature expedition with berth prices ranging from 14,000 to 22,000 euros. Along the way, passengers visited isolated stops including Antarctica, the Falkland Islands, South Georgia, and several remote Atlantic islands, where they would have encountered diverse wildlife including whales, dolphins, penguins, and seabirds. None of the 149 passengers and crew who remained aboard on Monday could have anticipated that the voyage would become a landmark in the medical history of one of the world’s rarest and most feared viruses.
South Africa’s Health Department confirmed that two of the dead were Dutch nationals a 70-year-old man who died on Saint Helena on April 11, and his wife, aged 69, who died weeks later in South Africa after collapsing at Johannesburg’s O.R. Tambo International Airport. The couple’s deaths, separated by weeks and by thousands of miles of ocean and continent, form the haunting emotional centre of a story still being written in real time.
The Dutch man’s cause of death could not be determined on board the vessel, and his body was removed at Saint Helena on April 24, accompanied by his wife. Three days later, another passenger a British national became seriously ill and was medically evacuated to Johannesburg, where a variant of hantavirus was confirmed. A German national then died on board the ship on May 2, though it has not yet been established whether the virus caused all three deaths, according to Oceanwide Expeditions.
The British patient is now in critical condition at a private medical facility in Johannesburg and is the only case so far confirmed to be hantavirus through laboratory testing. Two crew members one British, one Dutch remain aboard the ship with acute respiratory symptoms requiring urgent care, though hantavirus has not yet been confirmed in either case.
What makes the MV Hondius outbreak medically extraordinary and deeply unsettling to infectious disease specialists is precisely where it should not be happening. Scott Miscovich, a family physician and president and CEO of Premier Medical Group, said it is highly unusual for a hantavirus outbreak to occur on a ship that has not travelled anywhere where the virus is endemic. “When I first read this, I thought that they were making a misprint,” he told CNN.
Hantavirus is a rodent-borne illness. Hantaviruses cause two serious syndromes: hantavirus pulmonary syndrome, affecting the lungs, and hemorrhagic fever with renal syndrome, affecting the kidneys. Just one type the Andes virus is known to be capable of person-to-person transmission, though this is rare. It is primarily found in Chile and Argentina, where the ship originated. Investigators now believe the most probable explanation is that the ship’s hull or storage areas were contaminated with rodent droppings or urine, or that a passenger was exposed to the Andes variant during the ship’s southern South American stops before boarding.
Professor Adam Taylor of the University of Lancaster noted that hantavirus is “incredibly rare and probably underdiagnosed,” with at least 38 recognised species across the globe. “Not everybody who catches hantavirus will end up with symptoms, will end up with severe symptoms, or will end up with any at all,” he said. “There is a huge spectrum of how hantavirus affects people across the world.” He added that there is no specific cure for the disease only symptom management.
There are currently 149 people on board the ship 88 passengers and 61 crew members representing 23 different nationalities. Seventeen passengers are Americans. Cape Verde’s Health Minister Maria da Luz Lima confirmed that no one would be permitted to disembark on the island nation as a precautionary measure, even as local health authorities visited the ship to assess the two symptomatic crew members still aboard. Ireland confirmed two of its citizens were on board. Canada confirmed four nationals. Global Affairs Canada said no Canadians had been directly affected by the outbreak.
The emotional reality aboard the vessel was captured by travel vlogger Jake Rosmarin, one of the passengers confined to the ship. “What’s happening right now is very real for all of us here. We’re not just a story. We’re not just headlines,” he said in a video posted on Instagram, his voice cracking with emotion.
Oceanwide Expeditions said it was exploring the possibility of sailing to Las Palmas or Tenerife in Spain’s Canary Islands if Cape Verde continued to deny docking permission. Dutch authorities announced they would lead a joint effort to repatriate the two symptomatic crew members from Cape Verde to the Netherlands.
WHO Regional Director for Europe Dr. Hans Kluge said the organisation was “acting with urgency” following the tragic loss of life. “Health threats do not respect borders. Working together is how we protect people,” he said, adding that he was in contact with authorities in Europe and South Africa to ensure a science-based response.
The WHO said it was helping the ship’s operators coordinate a medical evacuation of the two symptomatic crew members, and that medical care was being provided to those on board who needed it. Virus sequencing was underway, and full epidemiological investigations had been launched.
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The WHO’s public guidance was deliberately measured: “There is no need for panic or travel restrictions,” Kluge said, emphasising that while hantavirus can be severe in some cases, it is not easily transmitted between people, and the risk to the wider public remains low.
For the families of three passengers who boarded a luxury expedition ship in Argentina and did not come home, those assurances arrive too late. For the 149 people still aboard the MV Hondius, anchored in Atlantic waters off a coastline that will not let them in, the investigation cannot move fast enough.
