The Centers for Disease Control and Prevention (CDC) has issued a formal health alert warning Americans about the risk of hantavirus following a rare but severe outbreak aboard the luxury expedition ship MV Hondius. The advisory, released on May 11, 2026, comes after three confirmed deaths and multiple infections linked to the Andes virus strain during the vessel’s transatlantic voyage, urging recent passengers and close contacts to monitor for symptoms and seek immediate medical care if they appear.
Health officials confirmed the outbreak involved the Andes hantavirus, notable for its limited person-to-person transmission capability. The MV Hondius departed from Ushuaia, Argentina in early April for a 33-day polar expedition. Passengers likely encountered the virus through contact with rodent droppings or contaminated surfaces during shore excursions in South America. Symptoms typically began with fever, muscle aches, and fatigue before rapidly progressing to severe respiratory distress characteristic of hantavirus pulmonary syndrome.
The CDC alert targets the more than 100 passengers and crew members who were on board, particularly the 17 American citizens who have returned to the United States. Several U.S. passengers are currently under medical monitoring at specialized biocontainment units, including the University of Nebraska Medical Center. One American tested positive while still asymptomatic, highlighting the importance of proactive testing and isolation protocols.
According to the CDC, early symptoms can appear anywhere from one to eight weeks after exposure. Initial signs mimic the flu — high fever, chills, headaches, and gastrointestinal issues — but can quickly escalate to coughing, shortness of breath, and fluid-filled lungs. The agency stresses that anyone who traveled on the MV Hondius should contact their healthcare provider immediately if symptoms develop, mentioning their cruise history for proper diagnostic testing.
Global Response and Containment Efforts
This marks one of the largest known clusters of Andes hantavirus outside South America. International health authorities, including the World Health Organization, have coordinated with the CDC to track passengers from over 20 countries. Many travelers were evacuated via military and chartered flights under strict infection control measures after the ship finally docked in Tenerife, Canary Islands.
The CDC advisory includes detailed guidance for clinicians on recognizing, testing, and managing potential cases. Supportive care remains the primary treatment approach, as no specific antiviral exists for hantavirus. Early hospitalization and respiratory support significantly improve survival chances, though the virus still carries a high mortality rate in severe cases.
Cruise industry experts say this incident could impact future expedition travel to remote regions. The MV Hondius, operated by a respected polar cruise company, has undergone extensive disinfection, and no new cases have been reported among crew members still on board. However, the event underscores the unique health risks associated with adventure cruising in wildlife-rich environments where rodents may carry viruses.
Public health officials continue to reassure the general public that the risk of community spread remains very low. Unlike respiratory viruses such as COVID-19, Andes hantavirus requires prolonged close contact for human-to-human transmission. Most people in the United States face greater risk from domestic hantavirus strains carried by deer mice in rural areas.
Travelers planning similar voyages are advised to review the CDC’s updated guidance on hantavirus prevention, including avoiding contact with rodents and their droppings during shore excursions. The agency continues active surveillance and contact tracing in coordination with state health departments.
As investigations into the exact source of the outbreak continue, this CDC health alert serves as a critical reminder of emerging zoonotic threats in our interconnected world. Passengers from the affected cruise are urged to remain vigilant during the coming weeks. The situation highlights both the wonders and potential hazards of remote travel, prompting enhanced health protocols across the expedition cruising sector.
Americans with questions about symptoms or exposure can contact the CDC’s hotline or visit the agency’s dedicated hantavirus webpage for the latest updates and recommendations.