WHO Warns of Potential Rise in Hantavirus Cases Following Cruise Ship Outbreak

The World Health Organization (WHO) has urged countries to prepare for a potential increase in hantavirus cases following a serious outbreak aboard the cruise ship MV Hondius. While officials state there is currently no evidence of a larger global outbreak, the long incubation period of the virus and the high level of interaction between passengers mean more cases could emerge in the coming weeks.

The MV Hondius Outbreak: What We Know

The MV Hondius, which was sailing from Argentina to Cape Verde, became the center of a medical emergency after three passengers—a German national and a Dutch couple—died from the virus. The WHO has confirmed nine cases of the Andes variant of the hantavirus, including a US national and a French woman who were evacuated from the ship.

While hantavirus is typically spread through contact with wild rodents, the Andes variant is notable because it can be transmitted from person to person in rare instances of close contact. This possibility is a primary concern for health officials given the confined environment of a cruise ship.

Critical Medical Updates

The severity of the illness varies significantly among those infected. Health officials in Paris reported that a 65-year-old French patient is currently in intensive care with the “most severe form of cardiopulmonary presentation.” Dr. Xavier Lescure noted that the patient, who has pre-existing conditions, is utilizing an artificial lung and a blood bypass to survive the critical stage of the disease.

In contrast, a Spanish national among the 14 evacuees quarantined at a military hospital in Madrid is reported to be stable. Although this patient tested positive for hantavirus and presented with a low-grade fever and mild respiratory symptoms, they have shown no evident clinical deterioration.

International Response and Evacuation Efforts

The evacuation of the MV Hondius was a complex international operation. After Cape Verde refused the ship permission to dock, the Spanish government allowed the vessel to anchor and briefly dock in Tenerife. More than 120 passengers and crew members were evacuated in a coordinated effort on Sunday and Monday.

WHO Director-General Tedros Adhanom Ghebreyesus praised Spain’s “compassion and solidarity” and Prime Minister Pedro Sánchez’s leadership, citing the response as a model for other nations.

Global Monitoring and Quarantine Measures

• United Kingdom: The UK Health Security Agency is bringing 10 people from the remote South Atlantic islands of Saint Helena, Ascension, and Tristan da Cunha to the UK as a precautionary measure. 20 British nationals, one UK-resident German national, and one Japanese passenger have been isolating at Arrowe Park hospital in Wirral.
• Netherlands: Evacuees arrived at Eindhoven airbase, with initial flights testing negative for the virus. However, a protocol breach occurred at Radboudumc hospital in Nijmegen, where 12 staff members were quarantined for six weeks after handling the blood and urine of a hantavirus patient without proper protections.
• WHO Recommendations: The WHO advises a 42-day quarantine and constant monitoring for high-risk contacts.

Why the Risk Persists

The primary concern for health authorities is the “index case”—the first person infected on the ship—who was identified as early as April 6. Because the alarm was not raised and infectious prevention measures were not immediately in place, passengers had significant interaction for weeks.

Tedros Adhanom Ghebreyesus explained that the virus’s incubation period lasts between six to eight weeks, creating a window where infected individuals may be asymptomatic while still potentially posing a risk or awaiting the onset of severe symptoms.

Current Status of the MV Hondius

The MV Hondius has refueled and restocked in Tenerife and is currently sailing back to its port in Rotterdam. The ship is operating with a reduced complement of 25 crew members, accompanied by a doctor and a nurse.

While France’s health minister, Stéphanie Rist, stated that officials are “rather reassured” regarding the possibility of mutation, complete sequencing of the virus is still required to rule out any genetic changes in the strain.