Hantavirus outbreak aboard cruise ship leaves three dead, WHO says

Three deaths aboard the Dutch-flagged MV Hondius turned a South Atlantic cruise into a hard test of outbreak detection, reporting and isolation across multiple borders. The World Health Organization said it was notified on 2 May of a cluster of severe respiratory illness among the ship’s 147 passengers and crew, and by 4 May the count had risen to seven cases, including two laboratory-confirmed hantavirus infections, five suspected cases, one critically ill patient and three people with mild symptoms.

The illness began to emerge between 6 and 28 April as the vessel moved from Ushuaia, Argentina, through mainland Antarctica, South Georgia, Nightingale Island, Tristan da Cunha, Saint Helena and Ascension Island. The ship carried 88 passengers and 59 crew members from 23 nationalities and was moored off Cabo Verde by 4 May. WHO said the global public health risk was low, but the response required coordination across islands, ports, hospitals and health authorities as cases were isolated, treated, evacuated and sent for laboratory investigation.

South Africa provided some of the clearest public details as the ship approached the African coast. The first patient was a 70-year-old male passenger who became ill while traveling from Ushuaia to Saint Helena with fever, headache, abdominal pain and diarrhea. He died on arrival at Saint Helena, and his remains were left there pending repatriation to the Netherlands. His 69-year-old wife collapsed at OR Tambo International Airport while connecting to a flight home and later died in a facility near Kempton Park, while her laboratory results were still outstanding.

A third patient, identified by South African authorities as a British national, became ill during the leg from Saint Helena to Ascension Island. After treatment in Ascension did not improve his condition, he was medically evacuated to a private hospital in Sandton, where South Africa said test results came back positive for hantavirus and he remained in critical condition in isolation. The Department of Health said it was working with the National Institute for Communicable Diseases and Gauteng health authorities on contact tracing, while reassuring the public that only two patients from the cruise ship had entered South African borders.

The episode underscores why cruise outbreaks can be so difficult to manage in real time. Human hantavirus infection is usually linked to contact with infected rodents’ urine, feces or saliva, but WHO and the Centers for Disease Control and Prevention note that Andes virus, the strain tied to South America, has shown limited person-to-person transmission. CDC has documented that spread in a 2014 Argentina cluster, and WHO says hantavirus cardiopulmonary syndrome in the Americas can carry a case fatality rate of up to 50 percent. The Hondius case shows how a fast-moving infection can hide behind symptoms that initially look like an ordinary respiratory illness until multiple jurisdictions are already involved.