Global health agencies track hantavirus spread from cruise ship outbreak

On Thursday, May 7th, health authorities across the globe began a coordinated effort to contain what had become an international health crisis: a hantavirus outbreak that started aboard the MV Hondius, an expedition cruise ship, and had already claimed three lives. The Dutch couple and a German national who died represented the visible toll of a virus that had infected at least five confirmed passengers, with three more suspected cases under investigation. Now the race was on to find everyone who had been near the ship before anyone knew the danger was there.

The MV Hondius had stopped in St. Helena, a remote island in the South Atlantic, on April 24th. Passengers from at least a dozen countries disembarked there—seven British citizens, six Americans, and others scattered across the globe. None of them knew they might have been exposed. The ship's operator, Oceanwide Expeditions, began the painstaking work of contacting everyone who had left the vessel at that port and anyone they had been in close contact with since. The company was also reconstructing the complete passenger and crew manifests going back to March 20th, trying to map the full scope of who might have been at risk.

The first confirmed case emerged in early May, but by then the damage was already spreading. A Dutch woman, who had boarded on April 1st, became so ill that KLM airline staff removed her from a plane in Johannesburg on April 25th. She died before reaching home. A KLM flight attendant who had been near her during that flight was later admitted to a hospital in Amsterdam showing possible hantavirus symptoms. The Dutch couple who died are believed to have been the first cases of this outbreak. Crew members and passengers who had helped the woman during her medical crisis were being called daily for health checks by Dutch authorities.

Three patients were evacuated from the ship on Wednesday. Two were admitted to hospitals in the Netherlands; a third was transferred to Germany. Martin Anstee, an expedition guide, was among those hospitalized in the Netherlands and told reporters he was "doing okay" but facing extensive testing. A Swiss man who had traveled on the Hondius was admitted to a hospital and tested positive. A Danish citizen who returned home was advised to self-isolate as a precaution. In the United States, Georgia was monitoring two asymptomatic residents who had disembarked, Arizona was tracking one, and California was watching several others. Texas reported two residents who had returned before the outbreak was identified. Canada had three citizens under observation—two who had come home before the outbreak and a third who had been on the same flight as a symptomatic person.

The World Health Organization moved quickly to manage public alarm. Maria Van Kerkhove, the WHO's director of epidemic and pandemic management, held a press conference to emphasize a crucial distinction: "This is not coronavirus, this is a very different virus." The Andean strain of hantavirus found in several victims can, in rare cases, be transmitted from person to person, but the WHO stressed that the risk to the general public remained extremely low. This was not the pandemic scenario the world had lived through six years earlier. The CDC said it was closely monitoring the situation but assessed the risk to Americans as extremely low. President Trump, briefed on the outbreak, told reporters he hoped it was "under control" and expressed hope that Americans would not need to be concerned about spread.

The immediate challenge was the dozens of passengers still aboard the MV Hondius as it sailed toward the Canary Islands, where it was scheduled to arrive Saturday or Sunday. None of the remaining passengers showed symptoms, but the WHO was preparing step-by-step guidance for their disembarkation and the journeys home that would follow. The ship had become a floating point of origin for a global contact-tracing operation, one that would unfold across continents as people returned to their homes and health authorities tried to stay ahead of a virus that, while rare in its person-to-person transmission, had already proven deadly.