World Health Organization is coordinating an emergency response after a suspected hantavirus outbreak aboard the expedition cruise ship MV Hondius, which is currently off the coast of Cape Verde.
Three people have died and three others are ill following what authorities believe to be exposure to hantavirus, a rare but potentially fatal infection typically spread through contact with rodent droppings, urine, or contaminated air. Laboratory testing has confirmed the virus in at least one of the affected individuals, raising concerns about broader exposure among passengers.
The vessel, operated by Oceanwide Expeditions, had been on a multi-week journey that began in Argentina and included stops in Antarctica before heading toward Cape Verde. Around 150 passengers are believed to be onboard.
Health authorities are now working to evacuate critically ill passengers, including at least one individual currently receiving intensive care treatment in South Africa. However, evacuation efforts have been complicated by restrictions from Cape Verde officials, who have not yet permitted disembarkation for medical treatment.
Hantavirus infection typically begins with flu-like symptoms such as fever, fatigue, and muscle aches, but can rapidly progress to severe respiratory distress and organ failure. Mortality rates can be high, particularly in cases involving hantavirus pulmonary syndrome, and there is no specific antiviral treatment—care is largely supportive, including oxygen therapy or ventilation in critical cases.
While human-to-human transmission is considered extremely rare, the confined environment of a cruise ship has heightened concerns, prompting a full public health risk assessment. The WHO is working with multiple governments and the ship’s operators to manage the situation, arrange medical transfers, and monitor the remaining passengers.
The incident underscores the vulnerability of closed environments like ships to infectious outbreaks, especially when dealing with rare pathogens that require rapid containment and coordinated international response.
