Three Dead, Dozens Quarantined: The Hantavirus Outbreak Unfolding on an Expedition Cruise Ship

When the MV Hondius departed Ushuaia, Argentina on April 1 with 114 passengers and 61 crew aboard, it was the start of what should have been a dream expedition: Antarctica, remote South Atlantic islands, the kind of voyage that adventurous travelers spend years saving up for. Instead, it became the site of one of the most alarming infectious disease outbreaks ever recorded on a cruise ship — and as of this week, the crisis is still far from over.

On May 25, Spain’s Ministry of Health confirmed that a second Spanish national has tested positive for hantavirus. The patient, already in isolation at the Gómez Ulla Central Defense Hospital in Madrid, is among 14 Spanish passengers evacuated from the ship and quarantined since May 10. Officials were quick to note that “the fact that the case was detected among those already in quarantine does not modify the risk situation” for the general public — but that measured reassurance doesn’t make the broader picture any less sobering.

According to CBC News, which broke the latest development, this is the second confirmed case among the Spanish cohort alone. Cases have also been confirmed in France and Canada, with passengers from at least a dozen countries — including the United States, Australia, Germany, the Netherlands, Singapore, South Africa, Switzerland, and Turkey — currently hospitalized or under quarantine in their home nations.

What We Know About the Outbreak

The culprit is the Andes virus, a strain of hantavirus found predominantly in the Andes mountain regions of Argentina and Chile. It carries a grim distinction: it is the only known hantavirus capable of spreading directly between humans — not just from rodents to people, as is the case with most hantavirus strains. Three passengers died in the weeks following the ship’s departure, making this one of the deadliest disease events in modern cruise history.

The WHO was notified of the respiratory illness cluster on May 2. By then, the ship was still at sea, passengers falling ill in a remote part of the South Atlantic with limited access to emergency care. Dozens of passengers were evacuated at Saint Helena — the remote British island where Napoleon spent his final years — while the remaining passengers disembarked at Spain’s Canary Islands before being repatriated to their home countries.

The CDC has issued quarantine orders for at least two U.S. passengers repatriated to a Nebraska quarantine facility, with 18 Americans total asked to remain under monitoring through May 31.

Why This Story Matters for Cruise Travelers

This outbreak is extraordinary in several respects. First, the sheer geographic scope of the response is unlike anything we’ve seen play out from a single voyage — health authorities across four continents are simultaneously tracking former passengers of the same ship. Second, the Andes virus transmission dynamic raises questions that the cruise industry has never seriously had to grapple with before. Traditional norovirus or respiratory illness outbreaks on ships are serious, but hantavirus — particularly a person-to-person transmissible strain — is an entirely different category of risk.

The MV Hondius is operated by Oceanwide Expeditions, a Dutch company specializing in polar and remote expedition cruises. These vessels attract a specific type of traveler: experienced, adventure-oriented, willing to visit places most people will never see. The very remoteness that makes these itineraries appealing is also what made the outbreak so difficult to contain and respond to in real time.

Hantavirus symptoms typically take between one and eight weeks to emerge after exposure, with most cases appearing within four to six weeks. That incubation window — combined with the international nature of the passenger manifest — is precisely what makes outbreak tracing and containment so complex.

The Situation Is Still Developing

With patients still under quarantine across multiple countries and the incubation window not yet fully elapsed for all former passengers, health authorities are not ready to declare this outbreak over. The confirmation of a second Spanish case on May 25 is a reminder that new positive tests can still emerge weeks after the initial exposure event.

We will continue tracking this story as it develops.

Source: Spanish passenger from the MV Hondius cruise ship tests positive for hantavirus — CBC News, published May 25, 2026.