How hantavirus may have spread aboard a cruise ship, according to health experts

Key Points:

• A suspected hantavirus outbreak on the MV Hondius cruise ship in the Atlantic has resulted in at least three deaths and about 150 passengers and crew stranded, prompting an ongoing investigation and quarantine efforts.
• Health officials, including WHO, suggest limited human-to-human transmission may have occurred among close contacts, such as couples sharing cabins, though the virus likely originated off the ship, possibly from wildlife exposure in Argentina or island stops.
• The hantavirus strain involved may be the Andes virus, known for rare human-to-human transmission requiring prolonged close contact, with previous outbreaks primarily in South America; hantavirus remains a rare disease overall.
• Multiple passengers have tested positive or are suspected of infection, leading to medical evacuations and restrictions on docking; no rodents were found aboard the ship, reducing likelihood of onboard transmission.
• Authorities are conducting epidemiological assessments and contact tracing, with passengers potentially quarantined for up to eight weeks due to the virus's incubation period, while addressing the psychological impact on those affected.