U.S. travelers — especially the elderly, young children, and people with chronic or immunocompromising conditions — should avoid expedition and long‑haul cruise voyages for now after a suspected hantavirus outbreak aboard the Dutch polar expedition ship MV Hondius that has left three dead and multiple passengers ill.

A suspected hantavirus outbreak aboard a polar expedition cruise ship has raised growing concern among international health authorities, prompting warnings for vulnerable travelers — including elderly passengers, young children, and people with chronic illnesses — to avoid long-haul expedition cruises until investigations are completed.

The incident occurred aboard the Dutch expedition vessel MV Hondius, which departed Ushuaia, Argentina, on April 1, 2026, for a remote South Atlantic and Antarctic voyage. The ship was later anchored off Cape Verde as health officials launched an investigation into a cluster of serious illnesses reported among passengers.

Authorities have confirmed at least one laboratory-verified hantavirus infection, while several additional suspected cases remain under review. Three passengers have died, and multiple others were reportedly hospitalized or medically evacuated during the voyage. The vessel carried approximately 149 to 150 passengers and crew members of various nationalities.

Health experts warn that hantaviruses can cause severe and potentially fatal respiratory disease, including hantavirus pulmonary syndrome (HPS). Certain strains found in the Americas, such as the Andes virus, are associated with high fatality rates, and limited person-to-person transmission has been documented in rare cases.

Medical specialists say expedition cruises present unique dangers during infectious disease outbreaks because passengers remain in confined environments with shared ventilation systems and limited onboard critical-care capacity. The risks become significantly greater in remote regions where access to advanced medical facilities and emergency evacuation can be delayed for days.

U.S. health and travel experts are advising older adults, immunocompromised individuals, patients with heart or lung disease, and families traveling with infants or very young children to postpone expedition and long-distance cruise travel for the time being.

For travelers unable to delay their trips, experts recommend selecting shorter, land-based itineraries with easier access to hospitals and emergency transportation. Travelers are also urged to verify whether cruise operators maintain comprehensive medical evacuation plans and to purchase travel insurance that specifically covers intensive-care treatment and emergency evacuation.

Passengers aboard cruise vessels are being advised to seek immediate medical attention if symptoms such as fever, severe headache, muscle pain, or breathing difficulties develop. Health authorities also stress the importance of isolating symptomatic individuals and following all onboard medical instructions.

The World Health Organization is coordinating the international investigation and has stated that although sustained human-to-human transmission appears unlikely, close-contact spread cannot yet be completely ruled out. Global public-health risk remains officially classified as low, though officials caution that the situation is still evolving.

U.S. travelers have also been encouraged to monitor updates from the Centers for Disease Control and Prevention and the United States Department of State for potential travel advisories, health guidance, and repatriation information.

The outbreak has renewed broader concerns about the safety of remote expedition cruises, particularly for medically vulnerable travelers. Until investigators determine the full scope of the outbreak and cruise operators demonstrate stronger disease-control measures, medical preparedness, and transparent health screening procedures, experts say high-risk travelers should reconsider cruise vacations in isolated regions and instead favor destinations with rapid access to advanced medical care.