Cruise Ship Hantavirus Cases Raise International Health Concerns

WHO and global health agencies are monitoring a hantavirus cluster aboard a cruise ship after multiple deaths and international contact tracing effort

Cover Image Attribute: File photo of MV Hondius at Spitsbergen in June 2025 / Source: Wikimedia Commons

A cluster of hantavirus infections aboard a luxury cruise ship crossing the Atlantic has drawn coordinated international response from health authorities, with five confirmed cases and three deaths reported as the vessel approaches its final destination. The outbreak, involving the Andes strain capable of limited person-to-person transmission through close contact, originated from passengers who likely encountered infected rodents during pre-cruise travel in South America, highlighting challenges in detecting rare zoonotic diseases in mobile populations.
The MV Hondius (IMO: 9818709 and MMSI: 244327000), operated by Oceanwide Expeditions, departed Ushuaia, Argentina, on April 1 with approximately 150 passengers and crew members from 28 countries for what was intended as a routine expedition. Among those boarding were a Dutch couple who had recently completed a bird-watching trip through Argentina, Chile and Uruguay, visiting sites where rodents carrying hantavirus are known to reside. Health officials later identified this travel as the probable initial exposure point for the index cases. The ship’s long voyage provided an environment of prolonged close quarters that allowed undetected spread before symptoms emerged.
The first fatality occurred weeks into the journey. A 69-year-old Dutch woman died, and her body was removed when the vessel stopped at the remote island of St. Helena in the South Atlantic on April 24. At that time, 29 other passengers disembarked without comprehensive contact tracing protocols in place, a development that has since prompted urgent efforts by multiple countries to locate and monitor them. Her Dutch husband also succumbed, with authorities investigating both cases as linked to the virus. A third death involved a German woman who passed away on May 2, her body remaining aboard as the ship continued its route.
By early May, the total count stood at eight suspected cases, five of them laboratory-confirmed as Andes hantavirus, the only known hantavirus species with documented, though limited, human-to-human transmission. The three deaths represent a significant portion of the identified infections. South African authorities confirmed the strain in two passengers, aligning with findings from other nations. No new symptomatic cases have been reported among those still aboard, which officials described as a positive but cautious indicator given the virus’s incubation period.
Hantavirus infections generally spread through contact with infected rodents or their urine, droppings or saliva, rather than casual human interaction. Symptoms typically appear between one and eight weeks after exposure and can include fever, headache, muscle aches, and gastrointestinal distress, progressing in severe cases to respiratory or kidney complications. There is no specific cure or vaccine, but early supportive care improves survival odds. The Andes variant’s potential for close-contact transmission sets it apart from most other hantaviruses, though experts emphasize it requires prolonged, intimate exposure unlike more contagious respiratory viruses.
World Health Organization Director-General Tedros Adhanom Ghebreyesus addressed the situation on May 7, noting that while serious, the public health risk remains low. “While this is a serious incident, WHO assesses the public health risk as low,” he said. He added that given the incubation period, “it’s possible that more cases may be reported.” WHO epidemiologist Maria van Kerkhove reinforced that the dynamics differ markedly from Covid-19 or influenza, stating at a briefing that the virus “spreads very, very differently” and requires close, intimate contact. Authorities have recommended masks aboard the ship and higher protective equipment for caregivers.
The WHO was notified on May 2 and has since coordinated under the International Health Regulations with affected countries. Actions include deploying an expert to the vessel for medical assessments, shipping 2,500 diagnostic kits from Argentina to laboratories in five countries, and preparing guidance for safe disembarkation. Priorities focus on patient care, protecting remaining passengers and crew, and preventing further spread. Abdirahman Sheikh Mahamud, heading WHO emergency operations, described the situation as a cluster in a confined space and expressed confidence that, with measures in place, it would not lead to a large epidemic or sustained transmission chains.
The ship anchored off Cabo Verde on May 6, where three individuals were medically evacuated. A fourth was transported to Amsterdam the following day. As of the latest updates, no passengers or crew currently aboard are showing symptoms. The vessel is scheduled to reach Spain’s Canary Islands on May 10, where detailed protocols for disembarkation and onward travel are being finalized to ensure dignity and safety. The operator is working to trace all individuals who boarded or left the ship since March 20.
Health officials across more than a dozen countries have mobilized to track the dozens who disembarked at St. Helena and any others who may have had contact with confirmed or suspected cases. Passengers and crew are being isolated or monitored in facilities in the United Kingdom, Germany, the Netherlands, Switzerland and South Africa. Argentine authorities have not pinpointed the precise origin but plan rodent testing in Ushuaia and surrounding areas. They noted after provincial meetings that current information does not allow confirmation of the infection’s starting point.
This incident underscores vulnerabilities in global travel when rare pathogens intersect with extended group exposures. Cruise ships, with their shared dining, excursions and accommodations, can amplify transmission risks for diseases with variable incubation periods. The delayed identification—symptoms unfolding over weeks before the cluster was recognized—illustrates how initial cases can be mistaken for other illnesses common during travel. The pre-cruise bird-watching activities in rodent-prone regions provided the likely zoonotic bridge, a pattern seen in past hantavirus outbreaks linked to rural or wilderness exposure in the Americas.
Broader context includes ongoing hantavirus activity in parts of South America, where environmental factors and rodent populations influence incidence. The Andes virus, endemic to the region, has previously shown limited human-to-human spread in household or close caregiving settings, but large-scale outbreaks remain uncommon when standard precautions are followed. International cooperation has been swift, reflecting lessons from prior public health events and the framework of the International Health Regulations designed precisely for cross-border threats.
Stakeholders have expressed measured concern balanced by reassurance. Ship operator Oceanwide Expeditions has cooperated fully with authorities, emphasizing passenger welfare and transparency in updates. National health ministries in affected countries are issuing guidance to clinicians for symptom recognition and testing, particularly for travelers returning from the region or with potential exposure history. Public messaging stresses that while vigilance is required, the virus does not spread easily in general community settings.
Forward considerations include completion of the ship’s journey and full passenger screening upon arrival in the Canary Islands. Long-term, this event may prompt reviews of pre-boarding health questionnaires, rodent control on vessels, and rapid diagnostic capabilities for expedition cruises visiting remote or ecologically sensitive areas. Experts caution against overreaction, noting hantavirus’s established epidemiology and the effectiveness of contact tracing in contained scenarios. WHO officials continue to monitor for additional cases while supporting affected nations in response and communication efforts.

With the vessel nearing the Canary Islands, the focus remains on orderly, science-guided management to protect both those directly impacted and the wider public. The episode serves as a reminder of the interconnected nature of global health, where a rodent reservoir in one continent can manifest aboard a ship traversing oceans, engaging multiple governments and international bodies in a unified, if still evolving, response. Authorities anticipate that with continued vigilance and the low transmissibility profile, the cluster will remain limited even as incubation windows close in coming weeks. 

With reporting by AP News, BBC, and World Health Organization.

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