WHO Warns Countries to Prepare for Rising Hantavirus Outbreaks

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The World Health Organization (WHO) has warned countries to prepare for additional hantavirus cases following a multi-country outbreak linked to the cruise ship MV Hondius. The warning comes as health authorities in France and Spain confirm severe cases, including a French woman on a ventilator in intensive care, while the WHO urges strict monitoring and quarantine measures for exposed individuals.

The outbreak, which has already claimed three lives—two Dutch nationals and one German passenger—has raised concerns about the potential for further spread. The WHO has confirmed nine cases of the Andes variant of hantavirus, including a French woman and a U.S. National who tested positive after being evacuated from the ship. The virus, typically spread by wild rodents, can also be transmitted person-to-person in rare cases of close contact.

WHO Urges Vigilance Amid Uncertain Trajectory

WHO Director-General Tedros Adhanom Ghebreyesus emphasized that while there is no immediate sign of a larger outbreak, the situation remains unpredictable due to the virus’s long incubation period. “At the moment, there is no sign that we are seeing the start of a larger outbreak, but of course the situation could change and, given the long incubation period of the virus, it’s possible we might see more cases in the coming weeks,” he stated during a press conference in Madrid on May 12, 2026.

The WHO has recommended a 42-day quarantine and constant monitoring of high-risk contacts, a measure Spain has implemented after taking in the stricken cruise ship. The ship, which was traveling from Argentina to Cape Verde, became the epicenter of the outbreak after passengers and crew members fell ill.

Medical and Public Health Context

Hantavirus infections are rare but can be severe, with the Andes variant—transmitted through aerosolized rodent urine or feces—posing a particular risk. Symptoms range from flu-like illness to life-threatening pulmonary syndrome, which requires intensive care. The CDC has issued a health advisory highlighting the cluster as a multi-country concern, noting that person-to-person transmission is possible but uncommon.

While the WHO has not declared a global emergency, the outbreak underscores the need for heightened surveillance in regions where rodent populations may carry the virus. Argentina, where the ship originated, has historically reported hantavirus cases, but the recent cruise ship cluster marks an unusual transmission event outside typical endemic zones.

What Comes Next

Health authorities are monitoring the situation closely, with the WHO calling on countries to enhance laboratory capacity and public health preparedness. The 42-day quarantine period—longer than typical for respiratory viruses—reflects the virus’s prolonged incubation, which can range from one to six weeks. Experts caution that additional cases may emerge as contacts continue to be monitored.

For now, the WHO advises travelers and health officials to remain vigilant, particularly in areas where rodent activity is high. Public health agencies are also urging strict adherence to quarantine protocols to prevent further spread.