Dutch Authorities Launch International Contact Tracing After Cruise Ship Outbreak
AMSTERDAM — KLM Royal Dutch Airlines said a 69-year-old Dutch passenger who later died from hantavirus was denied boarding on a flight from Johannesburg to Amsterdam after airline crew assessed her worsening medical condition while she was on board the aircraft.
The incident, which occurred on April 25 at O.R. Tambo International Airport in Johannesburg, has intensified international health monitoring efforts tied to an outbreak aboard the expedition cruise ship MV Hondius. The outbreak has so far claimed three lives and prompted contact tracing across multiple international flights and maritime routes.
KLM said the woman briefly boarded KLM Flight 592 bound for Amsterdam Schiphol Airport before crew members intervened.
“KLM crew denied boarding to the infected passenger at Johannesburg after assessing her deteriorating medical condition on board the aircraft,” the airline said.
The woman had traveled earlier that day from Saint Helena Airport to Johannesburg aboard an Airlink flight carrying 82 passengers and six crew members. Authorities are now tracing passengers and crew from both flights as part of a broader international public health response.
Cruise Ship Outbreak Under Global Health Surveillance
The outbreak originated aboard the MV Hondius, a Dutch-flagged expedition cruise vessel operated by Oceanwide Expeditions. Health officials said three passengers have died after contracting hantavirus, while five additional passengers and crew members have either tested positive or are expected to confirm infections.
The first reported fatality was a 70-year-old Dutch man who developed symptoms on April 6. According to health officials, his condition deteriorated rapidly and he died on April 11.
His wife, the 69-year-old passenger later denied boarding by KLM, began showing symptoms on April 24 while still linked to the cruise itinerary. She disembarked at Saint Helena, a British overseas territory in the South Atlantic Ocean, where her husband’s remains had also been offloaded.
A third victim, identified as a German passenger, reportedly developed fever and flu-like symptoms on April 28. Her illness progressed into pneumonia, and she died on May 2, according to Dutch media reports cited in the release.
The World Health Organization is monitoring the outbreak as health agencies work to determine the extent of potential exposure among passengers, crew members and transport workers connected to the vessel.
KLM and Dutch Health Agencies Coordinate Response
KLM said Dutch public health authority RIVM informed the airline that one of the deceased hantavirus patients had briefly been aboard the aircraft in Johannesburg.
The airline said the crew determined the passenger was unfit to travel before departure. After she was removed from the aircraft, Flight 592 departed Johannesburg for Amsterdam at 11:15 p.m. local time.
The service was operated as a codeshare flight involving Air France, Delta Air Lines and Scandinavian Airlines.
KLM said it is cooperating with RIVM and the GGD municipal health services as authorities work to identify and contact all potentially exposed passengers.
“The GGD has initiated contact tracing and is reaching out to all passengers who were on board the aircraft during the incident,” the airline said.
Contact Tracing Expands Across International Routes
Health authorities are also focusing on the Airlink flight that transported the Dutch passenger from Saint Helena to Johannesburg before her attempted KLM departure.
Officials said the woman appeared visibly ill during the Airlink journey but was initially permitted to board the KLM aircraft before airline staff intervened.
Dutch authorities are now coordinating with South African and international health agencies to monitor passengers and crew members who may have had contact with the infected traveler across both flights.
Additional Cases Raise Concerns
Further cases linked to the MV Hondius continue to emerge.
On the same day the Dutch woman left the ship at Saint Helena, a British passenger reportedly sought treatment from the vessel’s doctor after developing fever, shortness of breath and symptoms consistent with pneumonia.
According to the World Health Organization, the passenger’s condition worsened and he was evacuated by medical aircraft from Ascension Island to South Africa on April 27, where he was admitted to intensive care.
Health officials said all passengers and crew members aboard the MV Hondius during the outbreak period remain under observation as authorities continue efforts to contain the spread of the virus.
