A frightening outbreak of hantavirus aboard the Dutch cruise ship MV Hondius has set off an international public health response, with health authorities across more than a dozen countries scrambling to locate and monitor passengers who dispersed across the globe before the severity of the situation was fully understood.
The outbreak began in April 2026, when the MV Hondius departed Ushuaia, Argentina, on April 1. The first passenger died on board on April 11, and his body was only removed from the vessel thirteen days later when the ship docked at Saint Helena on April 24. His wife, who also disembarked at Saint Helena with gastrointestinal symptoms, later died in a hospital in Johannesburg, South Africa.
As of May 4, 2026, seven cases, two laboratory confirmed and five suspected, had been identified, including three deaths, one critically ill patient, and three individuals reporting mild symptoms. Illness onset occurred between April 6 and April 28, and was characterized by fever, gastrointestinal symptoms, rapid progression to pneumonia, acute respiratory distress syndrome, and shock.
By May 8, the WHO had updated its figures to report six confirmed cases and two probable cases, for a total of eight. Symptomatic patients are now hospitalized in six countries, including South Africa, Switzerland, the Netherlands, Germany, Saint Helena, and Spain.
The specific strain responsible has been identified as the Andes virus, making this outbreak particularly notable. The Andes virus is the only type of hantavirus known to spread from person to person, a transmission route usually limited to close contact, such as kissing, sharing utensils, or handling contaminated bedding.
Argentine health authorities published a report detailing the movements of the index case, a Dutch citizen who embarked on a four-month road trip across Chile, Uruguay, and Argentina from November 2025 before boarding the ship. He had returned to Argentina from Uruguay only four days before departure. Argentine health workers are now capturing and testing rodents along the route the passenger travelled.
In the United States, five states, Arizona, California, Georgia, Texas, and Virginia, are monitoring seven people who had already disembarked from the ship before the outbreak was declared. Officials say none is exhibiting signs of illness.
The CDC has classified its response at Level 3, its lowest emergency level. There is currently no licensed specific antiviral treatment for hantavirus infection. Patients receive supportive care including rest, hydration, and breathing support. The CDC warns that 38% of people who develop respiratory symptoms may die from the disease.
Despite the alarm, the WHO currently assesses the global risk from this outbreak as low, noting that documented human-to-human transmission of the Andes virus is uncommon and limited to cases of close, sustained contact.
What Are the Symptoms?
Symptoms of Hantavirus Pulmonary Syndrome (HPS) caused by the Andes virus can appear anywhere from 4 to 42 days after exposure. The illness typically unfolds in two stages.
Early symptoms often include fever, fatigue, muscle aches, headache, dizziness, chills, nausea, vomiting, diarrhea, and abdominal pain. Because these resemble many common illnesses, hantavirus can be difficult to identify in its initial phase. For HPS, the CDC describes a later stage, occurring roughly four to ten days after this initial phase, in which patients develop a cough, shortness of breath, and fluid accumulation in the lungs. This respiratory collapse can be rapid and severe.
In the Americas, hantaviruses can cause hantavirus cardiopulmonary syndrome, a severe respiratory illness with a case fatality rate of up to 50%. Anyone who has had potential exposure to an infected person or to rodents in affected areas and begins experiencing these symptoms should seek medical attention immediately and inform their doctor of the possible exposure.
How to Protect Yourself
For most people worldwide, the risk from this outbreak remains very low. The overall risk to travelers and the general public is considered extremely low, and routine travel can continue as normal.
That said, hantavirus does circulate in rodent populations in South America and elsewhere, and the following precautions are advised.
Hantaviruses spread from rodents to people when fresh urine, droppings, or nesting materials of an infected rodent are disturbed, sending the virus into the air, which can then be inhaled. The virus can also enter the body through cuts in the skin or through the eyes, nose, or mouth. Rodent control is considered the primary strategy for preventing infection, meaning wild rodents near human populations should be controlled and excluded from homes.
If cleaning an area with potential rodent contamination, ventilate the space first, and do not dry sweep or vacuum. Instead, wet contaminated material with disinfectant, wear gloves, and follow local public health guidance.
When cases are suspected, early identification and isolation, monitoring of close contacts, and standard infection prevention measures are important to limit further spread. In health-care environments, standard precautions should be applied for all patients, including hand hygiene, environmental cleaning, and safe handling of blood and body fluids.
The WHO advises that passengers and crew members practice frequent hand hygiene, remain vigilant for hantavirus symptoms, and undertake active symptom monitoring.
If hantavirus infection is suspected, standard precautions including distancing and wearing N95 masks are recommended, particularly given the Andes virus concern. Notably, many people who become ill with hantavirus report that they did not see rodents or rodent droppings beforehand.
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