WHO Traces Flight Passengers as Hantavirus Outbreak on Cruise Ship Raises Human-to-Human Transmission Concerns

Key facts

• Seven hantavirus cases (two confirmed, five suspected) on MV Hondius, including three deaths.
• Deceased: a Dutch couple and a German national; a British crew member in intensive care in South Africa is improving.
• Dutch woman disembarked in Saint Helena on 24 April with gastrointestinal symptoms, died on 26 April after flight to Johannesburg.
• WHO has initiated contact tracing for passengers on the Saint Helena–Johannesburg flight.
• Spain will welcome the ship for investigation and risk assessment.
• Illness onset occurred between 6 and 28 April 2026, with rapid progression to pneumonia and acute respiratory distress.
• Almost 150 people, including 17 Americans, remain stranded on the ship off Cape Verde.

Lede: A Deadly Virus on the High Seas

The World Health Organization is racing to trace passengers from a flight between Saint Helena and Johannesburg after a cruise ship passenger who died of hantavirus traveled on it, as the agency acknowledges that human-to-human transmission may have occurred among close contacts aboard the MV Hondius. The outbreak has claimed three lives and left one British crew member critically ill, with seven cases identified so far. The WHO has assessed the risk to the general public as low, but the incident has triggered a complex international response involving medical evacuations and port negotiations.

The Outbreak Unfolds: From Ushuaia to Cape Verde

The MV Hondius, operated by Oceanwide Expeditions, departed Ushuaia, Argentina, last month on a transatlantic voyage bound for Cape Verde, with planned stops at remote islands. Between 6 and 28 April 2026, passengers began falling ill with a rapidly progressing respiratory illness characterized by fever, gastrointestinal symptoms, pneumonia, acute respiratory distress syndrome, and shock. The company confirmed that several passengers were affected, and the ship is now anchored off Cape Verde with nearly 150 people on board, including 17 Americans.

Three Dead, One Critical: The Human Toll

Three people have died: a Dutch couple and a German national. The Dutch woman, who had gastrointestinal symptoms, disembarked in Saint Helena on 24 April. Her condition deteriorated during a flight to Johannesburg, and she died on 26 April. Her husband also died of the virus on the ship. A British crew member remains in intensive care in South Africa, though WHO Director for Epidemic and Pandemic Preparedness and Prevention Dr. Maria Van Kerkhove said his condition is improving. Two other people with hantavirus symptoms are still on board, with medical evacuation underway.

Human-to-Human Transmission Suspected Among Close Contacts

The WHO stated Tuesday that human-to-human transmission cannot be ruled out among the cases. “We do believe that there may be some human-to-human transmission that is happening among the really close contacts,” Van Kerkhove told reporters. She added that it is suspected the first person infected may have contracted the virus before boarding. The WHO has initiated contact tracing for passengers on the flight from Saint Helena to Johannesburg taken by the Dutch woman who died. Hantavirus is typically spread through contact with infected rodent urine, feces, or saliva, not through casual human contact.

Numbers and Evidence: Seven Cases, Two Confirmed

As of 4 May 2026, the seven cases: two laboratory-confirmed and five suspected. Three individuals have died, one is critically ill, and three have mild symptoms. The incubation period and onset dates suggest the outbreak began between 6 and 28 April. The WHO stressed that the risk to the global population is low. “This is not a virus that spreads like flu or like COVID. It’s quite different,” Van Kerkhove emphasized. Spain has agreed to welcome the ship, allowing for a thorough investigation and risk assessment of the remaining passengers.

What Comes Next: Medical Evacuations and Port Negotiations

Medical evacuation for the two symptomatic passengers still on board is currently underway.h South African authorities, where the British patient is hospitalized, and with Spain, which will host the ship for further investigation. Contact tracing for the flight from Saint Helena to Johannesburg is ongoing. The WHO continues to monitor the situation and will provide updates as more information becomes available. The incident raises questions about disease surveillance on long-haul cruises and the challenges of containing rare pathogens in isolated settings.

The bottom line

• The hantavirus outbreak on the MV Hondius has resulted in seven cases, three deaths, and one critical illness, with possible human-to-human transmission among close contacts.
• The WHO is tracing passengers on a flight from Saint Helena to Johannesburg taken by a deceased Dutch woman, whose symptoms began before the flight.
• Spain will allow the ship to dock for investigation, while medical evacuations are ongoing for two remaining symptomatic passengers.
• The risk to the general public remains low, as hantavirus does not spread easily between humans like flu or COVID-19.
• The outbreak highlights the need for robust health protocols on cruise ships and rapid international coordination for rare disease events.