A rare, deadly hantavirus outbreak has occurred on a luxury cruise ship, prompting a global track-and-trace operation as authorities scramble to contain a pathogen that has already killed three passengers and left experts racing to locate dozens of travellers who disembarked before the alarm was raised.
The World Health Organization was notified on 2 May of a cluster of severe respiratory illness aboard the Dutch-flagged MV Hondius. As of this morning, nine probable cases have been identified, with three fatalities. Six of the cases have been laboratory-confirmed as Andes virus (ANDV), a strain of hantavirus that is uniquely capable of limited human-to-human transmission. The ship itself, which departed Ushuaia, Argentina on 1 April for an Atlantic itinerary via Antarctica, South Georgia, Tristan da Cunha, Saint Helena and Ascension Island, was refused docking in Cape Verde and eventually anchored off Tenerife, where passengers began disembarking under tightly controlled conditions yesterday.
The outbreak began with a 70-year-old Dutch man who died on board on 11 April. His 69-year-old wife died two weeks later in Johannesburg, having travelled to South Africa. A third passenger, a German woman, died on 2 May. At least six further probable or confirmed cases have since emerged, including the ship’s doctor and one of its guides. Three of those patients are British.
What is hantavirus and how does it spread?
Hantaviruses are zoonotic – primarily carried by rodents and occasionally transmitted to humans through contact with infected animals’ urine, faeces or saliva, often via inhalation of aerosolised particles. The strain identified aboard the MV Hondius, Andes virus, is primarily found in South America and is notable for being the only hantavirus known to spread from person to person, though this is rare and requires close, prolonged contact.
Dr Charlotte Hammer, an infectious diseases epidemiologist at Cambridge University who leads a research team specialising in outbreak response, said the specific strain made containment efforts more straightforward. “All the evidence suggests this is a known strain of hantavirus, which makes the mission to contain it far easier,” she said. The virus causes hantavirus pulmonary syndrome, a severe and often fatal lung disease. Symptoms typically begin with fever, fatigue, muscle aches, headache and gastrointestinal issues – easily mistaken for flu – before progressing rapidly to cough, shortness of breath, acute respiratory distress syndrome and shock.
The incubation period for Andes virus is estimated at 7 to 39 days, with a median of 18 days. The case fatality rate in the current outbreak stands at 38% among confirmed cases, consistent with the 40–50% CFR historically associated with Andes virus in South America.
‘Disease detectives’ and containment efforts
Once the WHO confirmed the outbreak, a coordinated international response was activated. Because the ship is flagged to the Netherlands, Dutch authorities were involved early. Spanish authorities stepped in as the vessel approached the Canary Islands, and the WHO is leading coordination across all affected countries and those with nationals on board. “There’ll be a rolling team working 24/7,” said Dr Hammer.
The most likely scenario, she explained, is that one or two people caught the virus while travelling in South America before boarding, brought it onto the ship, and limited person-to-person transmission occurred on board. The challenge for disease detectives is systematic elimination of incorrect hypotheses while studying published reports and past evidence to form a coherent picture. “It’s why we call these experts ‘disease detectives’,” she said.
Containment begins with monitoring everyone who may have been exposed – and that includes every passenger and crew member who embarked on the cruise. While the confined, close-contact environment of a cruise ship sounds like a recipe for rapid spread, it has actually aided public health efforts. “Cabins are tight and small with limited air circulation – passengers remain in close, sustained contact for extended periods,” said Dr Hammer. Once the outbreak was identified, keeping remaining passengers on board until a choreographed departure was organised was relatively straightforward.
A more complex task was tracking down the 29 passengers of 12 nationalities – including seven British nationals – who disembarked early at remote stops such as Tristan da Cunha and Ascension Island. “Thanks to the isolated nature of the locations where they departed the ship, all will have had some sort of traceable ticket,” Dr Hammer said. “Plus, they have a rather pressing motivation to identify themselves to the authorities – it’s a scary disease. And given how much attention this story has received globally, the chances they’ll be unaware are low.”
As of this morning, two more passengers displayed symptoms and another tested positive overnight. One French national showed symptoms while on a chartered flight to Paris, leading all five French nationals on board to be placed in “strict isolation”. The US Department of Health and Human Services said that of the 17 Americans returning home, one has tested positive but does not have symptoms, while another has mild symptoms. Both were “travelling in the plane’s biocontainment units out of an abundance of caution”.
Our reporter on the ground in Tenerife, Robyn Vinter, described the scene throughout Sunday. “Dozens of people were brought to shore in blue plastic ponchos and face coverings. It was hard to gauge their expressions, but their body language portrayed exhausted, even bewildered, people.” By early evening, flights had taken off bound for several countries including the UK. Today, passengers from the US and Australia will be the last to leave. After that, the seas are due to get too rough and the ship will return to the Netherlands.
For the British passengers and crew, 20 of the 22 British nationals on board – 19 passengers and three crew – were transferred to Arrowe Park Hospital on the Wirral to isolate for up to 45 days, receiving clinical assessments and testing. None of the British citizens still on board were reporting symptoms as of 8 May, according to the UK authorities. Two British nationals have confirmed hantavirus infections, and a third has a suspected case on Tristan da Cunha.
Experts stress there is no need to panic. The virus has been known for decades, and while rare, it is not uncommon. Argentina sees 50–100 cases annually. “I would be surprised if any of this was a massive challenge for the authorities beyond the practical logistics,” said Dr Hammer. The WHO has repeatedly made clear this is not the start of a pandemic, with risks to public health “absolutely low”. The European Centre for Disease Prevention and Control assesses the risk to the general population within the EU/EEA as low, because human-to-human transmission requires close, prolonged contact and the natural rodent reservoir is not present in Europe.
UK politics: Starmer fights for survival
While the hantavirus outbreak has dominated global health headlines, Westminster is consumed by a political crisis. Keir Starmer faces a fight for his political life in the next 24 hours as potential Labour leadership rivals from Wes Streeting to Angela Rayner position themselves for a contest, according to party sources. The prime minister’s grip on power has been severely weakened by disastrous election results last week, and backbench MP Catherine West has launched a – likely futile – attempt to topple him.
The Times reports that the PM “fights to save his skin after Rayner ultimatum”, while the Telegraph leads with “Streeting: I’m ready to be PM”. The i Paper says “Today or never to save your job, Labour MPs tells Starmer”, and the Mirror adds “Change … before it’s too late”.
Other news in brief
Iran conflict: Donald Trump has rejected an Iranian response to a US peace proposal as “totally unacceptable”, on a day the ceasefire showed signs of fraying as drone strikes were reported around the region and Benjamin Netanyahu warned the war was “not over”.
UK news: Labour has accused Nigel Farage of attempting to dodge scrutiny as the Reform leader continued to face questions over the £5m gift he received from a crypto billionaire shortly before the last general election.
Business: The full nationalisation of British Steel is expected to be announced in the king’s speech this week, a year after the government took over the daily running of the loss-making business from its Chinese owner.
Health news: Experts have called for a four-day week in the UK as research suggests those who work longer hours are more likely to be obese.
The Upside
A bit of good news to remind you the world’s not all bad. Tilton, a small village in Leicestershire, launched a community electric car-sharing scheme after residents struggled with transport access. The club offers two shared EVs and volunteer drivers, improving mobility for locals. Miriam Stoate, a local regenerative farmer, worked with other volunteers and community energy organisation Green Fox to set up the scheme.
In the UK, transport is the largest source of carbon emissions, and despite rising EV sales, experts warn progress is too slow. Even if the government invests heavily in rail and buses, they won’t meet climate goals without reducing overall car use. Shared EV fleets and community-led solutions are essential to cutting emissions and congestion. Said Stoate: “We now have a viable transport option that everyone can use without buying more and more cars – and it has helped to build our community, too.”