A Virus Most Had Never Heard of Is Now a Global Concern
In April 2026, an outbreak of hantavirus infection caused by the Andes virus was identified on the Dutch cruise ship MV Hondius, which had departed Ushuaia, Argentina, on April 1, 2026. What followed has become one of the most complex international public health responses since the COVID-19 pandemic, involving 22 countries, the WHO, the CDC, and hospital quarantines across Europe and the United States.
The Hospital Breach That Raised the Alarm
Twelve hospital workers at the Radboudumc university medical centre in Nijmegen were placed in precautionary quarantine after following an incorrect procedure with a hantavirus patient admitted on May 7, following evacuation from the MV Hondius.
When taking the patient's blood, staff followed a standard procedure rather than the stricter protocol required given the nature of the virus. International regulations were also not followed when disposing of the patient's urine. The 12 staff members will remain in quarantine for six weeks, though the hospital stressed that infection risk was very low and patient care had continued uninterrupted.
Radboudumc board chair Bertine Lahuis stated: the hospital regretted the incident and would investigate the course of events carefully to learn from it and prevent recurrence.
What Is the Andes Virus and Why Does It Spread Differently
The type of hantavirus responsible for this outbreak is the Andes virus, which can lead to hantavirus pulmonary syndrome, a severe and potentially deadly disease that affects the lungs. What makes the Andes variant particularly dangerous is its rare capacity for person-to-person transmission.
A Harvard University professor of public health noted that in a previous outbreak, one person passed the virus to another simply by passing by at a birthday party and saying hello, warning that anyone on the ship should be considered high risk.
The MV Hondius: How the Outbreak Unfolded at Sea
The first passenger died on April 11. His body was taken ashore at Saint Helena on April 24, where his wife also disembarked and died two days later in a hospital in Johannesburg. A third passenger also died on board.
After Spain approved the vessel's arrival despite objections from the Canary Islands president, the ship departed for Tenerife on May 6, arriving on May 10 with 147 individuals on board. Passengers were evacuated and repatriated across six European countries and Canada.
Global Response: Quarantine Across Continents
Eighteen people are being monitored at US medical facilities. Sixteen are at the University of Nebraska Medical Center, one in the biocontainment unit after testing positive and 15 in the quarantine unit. Two patients were transferred to Emory University in Atlanta.
In the UK, 22 individuals were taken off the ship in Tenerife, screened, and flown to Manchester, where they entered 72-hour quarantine in self-contained flats at Arrowe Park Hospital, followed by 45 days of home isolation.
WHO Assessment: Serious but Not a Broader Outbreak
WHO Director General Tedros Adhanom Ghebreyesus said there was no sign that a larger outbreak was beginning, but warned that the long incubation period of the virus meant more infections could surface over the coming weeks. As of May 12, the WHO identified 11 cases, nine confirmed and three deaths, all linked to the cruise.
A former CDC director noted that the agency was on the sidelines of the response rather than leading it, citing the effects of staffing cuts and the absence of a full-time director.
