A rare virus outbreak aboard a cruise ship has triggered an international health response after three passengers died and health officials warned that everyone on board may have been exposed to a dangerous infection.
The World Health Organization announced that all passengers and crew members on the cruise ship MV Hondius should now be treated as high-risk contacts following an outbreak linked to hantavirus, a disease normally associated with rodents.
The outbreak has raised particular concern because the virus involved appears to be the Andes virus, which is the only known hantavirus capable of spreading directly between humans.
The ship was carrying nearly 150 passengers and crew members and was heading toward the waters near Tenerife in Spain’s Canary Islands. Health officials confirmed that three passengers have died so far, including a Dutch couple and a German woman.
Several other confirmed and suspected cases have also been identified.
Maria Van Kerkhove from the World Health Organization explained that everyone remaining on the ship should be closely monitored for 42 days after their last possible exposure to infected individuals.
The 42-day monitoring period is based on the possible incubation time of the virus, meaning symptoms can take weeks to appear after infection.
At the time of the announcement, WHO officials said no additional people on board were showing symptoms. Still, experts stressed that careful follow-up remains extremely important because early symptoms can resemble common illnesses.
Hantavirus infections often begin with fever, muscle pain, headaches, tiredness, nausea, and stomach problems. In severe cases, the disease can later cause dangerous breathing difficulties and lung failure.
Most hantavirus infections are linked to contact with rodents or contaminated rodent waste. People usually become infected by inhaling virus particles from rodent urine, saliva, or droppings.
Human-to-human transmission is extremely rare among hantaviruses. However, the Andes virus, which was first identified in South America, has previously shown the ability to spread between close human contacts.
This possibility has made international health agencies especially cautious during the cruise ship outbreak.
The World Health Organization said the risk to the general public remains low, including for residents of Tenerife and the Canary Islands. Officials believe the outbreak is currently limited to individuals connected to the ship.
Still, global coordination efforts are now underway because passengers and crew members come from multiple countries.
WHO Director-General Tedros Adhanom Ghebreyesus is reportedly traveling to Tenerife to assist with response efforts and evacuation planning.
Health officials are working together with Spain, the Netherlands, the cruise operator, and medical experts from around the world to organize what WHO described as a “safe and dignified” disembarkation process.
According to WHO officials, passengers who develop symptoms will be transferred directly onto medical evacuation planes and flown to the Netherlands for treatment.
Passengers without symptoms are expected to return to their home countries on separate flights arranged by their governments. Some countries are discussing sharing evacuation flights to simplify transportation.
Even after returning home, passengers and crew members will still require monitoring for 42 days.
During this period, health authorities may ask individuals to regularly report symptoms, monitor temperatures, and remain in contact with healthcare providers.
The outbreak demonstrates how quickly infectious diseases can become international concerns in highly connected environments such as cruise ships.
Cruise ships can create difficult conditions during outbreaks because large groups of people share dining areas, cabins, entertainment spaces, and ventilation systems while traveling together for long periods.
During the COVID-19 pandemic, cruise ships became major examples of how infectious diseases can spread rapidly in closed environments.
Experts say the current hantavirus outbreak is different because hantavirus infections are much rarer than respiratory viruses like influenza or COVID-19. However, the high death rate linked to severe hantavirus infections makes careful monitoring essential.
Scientists are especially interested in understanding how the Andes virus spreads between people and why it behaves differently from most other hantaviruses.
Researchers are also studying whether certain close-contact situations increase transmission risk and how quickly infected individuals become contagious.
After carefully analyzing the situation, the WHO response appears designed to prioritize caution because the outbreak involves a rare virus capable of severe illness and possible human-to-human spread.
The decision to classify everyone on board as high-risk contacts reflects uncertainty about transmission and the need to avoid additional cases.
At the same time, health officials continue emphasizing that there is currently little evidence of widespread community risk outside the ship itself. The coming weeks of monitoring will likely be critical in determining whether the outbreak remains contained.
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Source: World Health Organization.
