A hantavirus outbreak tied to the cruise ship MV Hondius has triggered contact tracing operations across multiple continents, prompted evacuations to Europe, and drawn the kind of international attention that makes pandemic comparisons almost inevitable. Health officials from the World Health Organization spent Thursday pushing back on those comparisons firmly and with specifics.
The ship departed Argentina in late March. By mid-April, a 70-year-old Dutch passenger had died aboard the vessel after presenting with fever, headache, abdominal pain, and diarrhea. Two more deaths followed, a second Dutch national and a German passenger. As of Thursday, WHO confirmed five cases connected to the vessel, with the total suspected case count at eight.
What the Andes strain is and why it matters for this outbreak
The hantavirus strain identified in this outbreak is the Andes variant, a designation that carries specific significance. Among all known strains of hantavirus, the Andes variant is the only one documented to transmit between humans. Other strains require direct contact with infected rodents or their droppings. That distinction is what elevated concern as passengers began leaving the ship and returning to their home countries before the scope of the outbreak was understood.
Hantavirus carries a fatality rate of up to 50% in the Americas, per WHO figures, and its incubation period runs from one to six weeks, meaning someone exposed on the ship may not show symptoms for weeks after returning home. WHO officials acknowledge that additional cases are possible for this reason and are urging all countries with returning passengers to maintain active monitoring.
Transmission, health experts emphasized at Today’s WHO press conference, requires close and prolonged contact, the kind seen among household members, intimate partners, and medical caregivers, not casual exposure in shared spaces.
Where the 146 remaining passengers are headed and what is happening globally
As of Today, 146 people from 23 countries remain aboard the Hondius under precautionary measures. The ship is scheduled to arrive in Tenerife in Spain’s Canary Islands around noon local time on Sunday, after which passengers will be flown to their respective home countries. Operator Oceanwide Expeditions said it is working to establish the details of every person who has embarked or disembarked the vessel since March 20.
Three passengers have already been evacuated to the Netherlands for hantavirus treatment, including a British national, a 65-year-old German, and a 41-year-old Dutch crew member. Two of the three are in serious condition. In South Africa, a British national who fell ill aboard the ship on April 27 remains in intensive care in Johannesburg, though WHO reported his condition is improving. A fifth confirmed case of hantavirus was identified in Switzerland after a passenger who left the ship received an email from the cruise operator about the outbreak, went to a local hospital, and tested positive.
Dutch health authorities disclosed they are also testing a KLM flight attendant who had contact with a 69-year-old Dutch woman who died in South Africa. If the attendant tests positive, she would be the first person connected to the outbreak who was neither a passenger nor crew member.
In the United States, health authorities are monitoring individuals in at least five states, including Georgia, Arizona, Texas, and Virginia, though no confirmed cases have been reported. Canada has three people self-isolating across Ontario and Quebec, one of whom was not aboard the ship but shared a return flight with passengers who were. Singapore reported two men in their 60s are self-isolating and awaiting test results. The UK’s Health Security Agency is tracking seven British nationals who left the ship at Saint Helena on April 24.
Why WHO says this is not Covid and what that distinction actually means
WHO Director-General Tedros Adhanom Ghebreyesus said at Today’s press conference that outbreaks of this nature underscore why health security requires international cooperation regardless of political considerations, noting that viruses are indifferent to borders and politics alike.
Maria Van Kerkhove, WHO’s acting director for epidemic and pandemic management, was direct in separating this situation from Covid. The virus spreads in a fundamentally different way, requiring sustained close contact rather than airborne or droplet transmission in public settings. Abdirahman Mahamud, WHO’s director for Health Emergency Alert and Response Operations, pointed to Argentina’s 2018 hantavirus surge as a precedent, arguing that following established public health measures can break the transmission chain.
Carlos del Rio, a professor at Emory University School of Medicine, added that while the immediate risk to the general public remains low, the hantavirus outbreak presents a meaningful opportunity to study a virus that is poorly understood and for which no vaccine or approved treatment currently exists.
