{Summary}
The May, 2026, Andes virus outbreak on the Dutch cruise ship (MV Hondius) that departed from Argentina, where the lethal virus was first described, represents a transmission context unprecedented in the known epidemiology of the virus. The Andes virus is the only member of the Hantaviridae family capable of efficient person-to-person spread through close contact with respiratory secretions. The epidemic potential of the virus was demonstrated during the 2018–19 Epuyén outbreak in Argentina, where four waves of infection from a social gathering resulted in 34 confirmed cases and 11 deaths. Despite passengers on board MV Hondius having now returned to their home countries, there are currently 13 reported cases with three deaths. The dispersal of nearly 150 passengers and high-risk contacts across 23 countries, monitored under varying quarantine protocols, and a 42-day virus incubation window, presents a complicated and critical vulnerability for public health agencies. Contact tracing is ongoing as ambiguity surrounds secondary transmission cases before containment measures were established. There are no vaccines or preventive treatments currently approved by the US Food and Drug Administration or the European Medicines Agency. The travel-related outbreak and potential for sequential transmission events underscore the urgency for vaccine development.
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