A hantavirus cluster associated with the MV Hondius has seen several patients evacuated for treatment and some travellers in the UK asked to self-isolate while agencies work to trace contacts
The expedition vessel MV Hondius has become the centre of an international public-health response after several passengers developed suspected hantavirus infections. Authorities say the majority of people on board are symptom-free, but a small number of cases linked to the voyage have prompted evacuations, contact tracing and advice for returning travellers.
Public agencies including the World Health Organization (WHO), the UK Health Security Agency (UKHSA) and the European Centre for Disease Prevention and Control (ECDC) are coordinating with national governments and the ship operator to monitor passengers and crew. While some fatalities have been reported among passengers who had disembarked earlier, officials stress that, at this stage, the risk to the wider community remains very low.
How authorities linked cases to the voyage
Investigations have focused on specific exposures that occurred before or during the trip. Local Argentine officials said a Dutch couple who joined a bird-watching excursion in Ushuaia and visited a landfill are now a leading hypothesis for how the outbreak began; they may have encountered infected rodents or contaminated material.
The WHO has connected at least eight suspected cases to the ship, with five of those eventually confirmed as hantavirus infections. Separate reports show one Dutch national who later died had briefly been on a KLM flight (KL592) from Johannesburg on 25 April 2026, a detail national health authorities have noted while tracing potential contacts.
Health agencies’ assessments and guidance
The ECDC advised treating everyone on board as a close contact because of the vessel’s enclosed spaces and shared activities, applying a precautionary approach. At the same time, the agency and the WHO have emphasised that this strain does not spread easily between people and that proper infection prevention and control reduces the likelihood of broader transmission. The UKHSA has said it is supporting British nationals from the ship, tracing flight contacts and offering testing and isolation advice to returnees; two people who independently returned to the UK have been told to self-isolate even though they are not reporting symptoms.
Medical evacuations and patient updates
On 6–7 May 2026, three passengers were medically evacuated for treatment in the Netherlands: a British expedition guide, a Dutch national and a German passenger. The British patient, identified as Martin Anstee, said he was isolated in hospital and awaiting further tests, noting he felt “okay” but could not yet predict how long he would remain admitted. The WHO confirmed the coordinated evacuations and said monitoring and follow-up for other passengers have been initiated in partnership with national authorities and the ship operator. Tragically, earlier fatalities among people who had been on or associated with the voyage have been reported in other countries, heightening the urgency of tracing and monitoring efforts.
Operational response and next steps for travellers
The ship operator, Oceanwide Expeditions, has maintained that the vessel is following high standards of biosecurity typical for expedition ships and that most people on board remain well. After evacuations were completed, Spanish authorities allowed the vessel to continue toward the Canary Islands, where health officials planned tests and disembarkation procedures. National governments, including the UK, have prepared plans to repatriate their citizens provided they remain symptom-free, with travellers expected to be tested and asked to isolate on return as a precaution.
Practical advice and public reassurance
Public-health teams recommend that anyone who travelled on the voyage or who had close contact with confirmed cases should follow guidance from their national health authority: monitor for symptoms, get tested if advised, and follow isolation instructions if required. Officials continue to stress that, despite the seriousness of individual cases, the overall public risk is low when control measures are applied: contact tracing, targeted testing and timely medical evacuation remain the primary tools to prevent onward spread.
As investigations continue and lab results are finalised, authorities aim to balance transparent communication with measured public guidance. The situation underscores the importance of recognising rodent-borne transmission routes and maintaining vigilance in environments where wildlife and people intersect, particularly on expedition-style voyages that visit remote locations.
