Three Dead, Eight Infected: How the Hantavirus Outbreak Is Unfolding

This started as a mysterious illness on a remote Atlantic voyage. It's now a hantavirus outbreak that has killed three people, infected eight, triggered international evacuations, and put passengers in their cabins while hazmat-suited medical teams work below deck.

The MV Hondius left Argentina on April 1 for an expedition cruise through some of the most isolated places on earth — Antarctica, South Georgia, Nightingale Island, Tristan da Cunha, Saint Helena, Ascension Island. The kind of trip that costs serious money and draws serious adventurers. By the time anyone understood what was happening, people were already dying.

As of May 7, the ship is en route to the Canary Islands after being anchored off Cape Verde. Three people are confirmed dead. Five confirmed cases and three suspected cases have been identified by the WHO. A Swiss man is being treated in a hospital in Zurich. A British national is being treated in South Africa. Two Singapore residents who disembarked early are in isolation and awaiting test results. And residents in Georgia, California, and Arizona are being monitored after returning to the US — none showing symptoms currently.

How It Started

A Dutch man developed fever, headache, and mild diarrhea on April 6. He deteriorated quickly. He died on the ship on April 11. His body sat aboard for nearly two weeks before being removed at Saint Helena on April 24.

That same day his wife went ashore at Saint Helena with gastrointestinal symptoms. She got on a flight to Johannesburg the next day and her condition collapsed mid-air. She died April 26. Her case was confirmed as hantavirus on May 4 — weeks after her husband was already dead.

Two anonymous Argentine investigators have since suggested the leading hypothesis is that the Dutch couple contracted the virus during a birdwatching outing near a landfill in Ushuaia before boarding — not during shore excursions on the remote islands. The Argentine health ministry published a report on May 6 showing the couple's movements over a four-month road trip through Chile, Uruguay, and Argentina in the months before they boarded. Rodent capture and testing along their travel route is now underway.

Another male passenger — a British national — reported fever, shortness of breath, and signs of pneumonia on April 24. He was evacuated to South Africa on April 27 and is currently in intensive care with confirmed hantavirus.

A fourth passenger, a German woman whose symptoms started April 28, died May 2.

Three people dead. The ship kept sailing.

The Part That Makes This Different

The WHO confirmed on May 6 that the strain is the Andes virus — and that detail changes the entire risk picture.

Most hantavirus strains don't spread between humans. You get it from infected rodents — from breathing in air contaminated by their urine, feces, or saliva in places where they've been. It's awful, but it's not contagious in the way flu is. The Andes virus is the exception. It's a South American strain documented to spread person to person through close contact. It's the only hantavirus known to do this consistently.

WHO official Maria Van Kerkhove said it plainly — "We do believe there may be some human-to-human transmission happening among really close contacts — the husband and wife, people who've shared cabins."

The Ship Has Nowhere to Go

What's unfolding now is as much a diplomatic crisis as a medical one. The ship planned to dock in Tenerife in the Canary Islands to evacuate its roughly 150 remaining passengers and crew from 23 nationalities. The Canary Islands' regional president Fernando Clavijo refused, saying he could not guarantee public safety. The WHO responded that Spain has "a moral and legal obligation to assist these people."

Spain's interior ministry has since said passenger evacuation will begin from the archipelago starting May 11, overruling the regional government. Three passengers were evacuated by air from Cape Verde before the ship departed — two have landed in the Netherlands, a third flight was delayed but the passenger is stable.

The Outbreak Is Now a Multi-Country Event

The reach of this outbreak extends well beyond the ship. French authorities confirmed a French national is being monitored as a contact case after traveling on the same flight as the Dutch woman who died — an Airlink flight that was carrying 82 passengers and six crew from Saint Helena to Johannesburg. Contact tracing for that flight is ongoing.

KLM has also notified passengers on a Netherlands-bound flight in Johannesburg on April 25, after Dutch health authorities confirmed the woman had briefly been aboard. Singapore isolated two residents — aged 65 and 67 — who disembarked from the Hondius early and were on the same Johannesburg-bound flight. One has a runny nose; the other is asymptomatic. Test results are pending. The CDC has issued a statement saying the US government is "closely monitoring" the situation and coordinating a whole-of-government response for American passengers.

What Hantavirus Does

Most people have never had a reason to think much about hantavirus. It's rare, it doesn't usually spread between people, and outbreaks tend to be small and geographically contained. Argentina has reported 101 hantavirus infections since June 2025 — roughly double the caseload from the same period the previous year, which is part of why investigators are looking hard at the couple's time in the country before boarding.

Symptoms show up two to three weeks after exposure — fever, chills, muscle aches, vomiting, diarrhea. Then in serious cases it hits the lungs and heart. Hantavirus Pulmonary Syndrome can have a fatality rate above 30 percent. There's no vaccine. No specific treatment. You manage the symptoms and hope the immune system wins. The window between "feeling off" and critical deterioration can be measured in days.

Look at the timeline on this ship. The Dutch man went from first symptoms to dead in five days.

What's Happening Right Now

Passengers remain in their cabins. Meals are being delivered. They can go to outer decks for air. Masks and distancing are in place. Three additional medical professionals boarded at Cape Verde. The ship is heading toward the Canary Islands where evacuation is expected to begin May 11, pending health authority decisions on screening and clearance protocols.

WHO Director-General Tedros Adhanom Ghebreyesus has said the overall public health risk remains low, and officials have dismissed comparisons to COVID-19. But investigators are still working to confirm the exact source of the outbreak and whether human-to-human transmission occurred on board — or whether all cases trace back to a single exposure event in Argentina.

WHO says global risk is low. That's probably accurate in the broad statistical sense. Inside those cabins, and on the flights those passengers took before anyone knew what was happening, it's a different kind of math entirely.

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