A deadly outbreak linked to hantavirus aboard a cruise ship has shocked health experts and raised concerns about one of the world’s most dangerous rodent-borne diseases.
Three passengers have died and several others became seriously ill after a suspected hantavirus outbreak on the cruise ship MV Hondius.
The incident has gained international attention because scientists believe the virus involved may be capable of spreading between people, something that is extremely rare for hantavirus infections.
The ship had been traveling through remote regions near Antarctica and the South Atlantic before the outbreak began. Eventually, the vessel was isolated near Cape Verde while health authorities worked to investigate the illness and find a safe place for the ship to dock.
The outbreak information was released through reports from the World Health Organization and health experts from Northeastern University.
Hantavirus is a virus carried mainly by certain species of rats and mice. People usually become infected after breathing in virus particles from rodent urine, saliva, or droppings.
Although the disease is uncommon, it can be extremely dangerous. In the Americas, some forms of hantavirus have death rates reaching 40% to 50%.
The illness often begins with symptoms that resemble the flu. Patients may develop fever, headaches, tiredness, stomach pain, diarrhea, or muscle aches. However, the disease can rapidly become much more severe.
Doctors say the most dangerous stage occurs when the virus damages blood vessels and allows fluid to leak into the lungs. This can lead to severe breathing problems and respiratory failure.
The first patient aboard the ship reportedly developed fever and stomach symptoms only days after the cruise departed from Argentina.
His condition worsened quickly, and he later died after developing respiratory distress. His wife became sick shortly afterward and later died in South Africa. Another passenger later died after developing fever and severe illness.
Several additional passengers were hospitalized, including one patient placed in intensive care.
Scientists suspect the outbreak may involve the Andes virus strain, which is mainly found in South America.
Unlike most hantavirus strains, Andes virus has been shown in rare situations to spread directly from person to person.
This makes the outbreak especially concerning because cruise ships are enclosed environments where people share cabins, dining areas, and public spaces for long periods.
Experts believe one infected traveler may have caught the virus during a shore excursion before unknowingly spreading it to others aboard the ship.
Neil Maniar, a public health expert from Northeastern University, explained that hantavirus infections can become severe very quickly once symptoms begin.
Joshua Merson, who specializes in wilderness and extreme medicine, said doctors working in remote environments remain especially alert for hantavirus pulmonary syndrome because delayed diagnosis can be deadly.
In the United States, hantavirus infections remain rare. Only a few dozen cases are usually reported each year. However, the disease is still feared because of its high death rate.
The most common American strain is called Sin Nombre virus. It is carried by deer mice and is mainly found in western states.
People can become infected when rodent waste becomes disturbed and tiny virus particles enter the air. This sometimes happens in cabins, sheds, campsites, barns, or other places where rodents gather.
Unlike the Andes strain, Sin Nombre virus does not spread between people.
Different hantavirus strains also cause different illnesses around the world. In Europe and Asia, hantavirus infections more commonly affect the kidneys and are associated with a condition called hemorrhagic fever with renal syndrome.
Doctors currently have no specific cure or vaccine for hantavirus.
Treatment mainly focuses on supportive care. Patients may require oxygen, intravenous fluids, medications to support blood pressure, ventilators, or advanced life-support systems if breathing becomes critically impaired.
Because treatment options are limited, prevention remains the best protection.
Health experts recommend sealing holes and gaps where rodents may enter buildings, storing food properly, and carefully cleaning rodent-contaminated areas using disinfectants rather than dry sweeping or vacuuming.
Masks and gloves are also recommended when cleaning rodent droppings or nests.
The outbreak also demonstrates how global travel can complicate infectious disease control. Cruise ships, wilderness tourism, and remote travel routes may allow illnesses to spread across multiple countries before they are recognized.
Scientists continue investigating exactly how the outbreak began and whether person-to-person transmission occurred aboard the ship.
Even though hantavirus remains rare, the outbreak serves as a powerful reminder that dangerous infectious diseases can still emerge unexpectedly, especially in isolated environments where early symptoms may appear mild at first.
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Source: Northeastern University and World Health Organization.
