Andes Hantavirus Outbreak on Cruise Ship Raises Scientific Questions

Public health officials are monitoring former passengers and crew of the MV Hondius following an outbreak of Andes hantavirus, which has sickened at least 11 people and caused three deaths. This incident marks the first documented transmission of the virus at sea. Scientists confirm that Andes hantavirus is the only species known to spread from person to person, unlike other hantaviruses typically transmitted via rodent excrement. The outbreak likely began when infected individuals contracted the virus ashore in Argentina, possibly near a landfill, before spreading it onboard. While transmission usually requires close contact involving saliva or respiratory secretions, evidence suggests some spread occurred through casual contact or airborne particles, similar to other respiratory viruses. Health authorities in multiple countries are tracking contacts due to the virus's six-week incubation period. Researchers continue to investigate why this specific variant allows human-to-human transmission and what factors contribute to its high mortality rate. The event highlights the unique dangers of Andes hantavirus compared to other strains found globally.