Hantavirus is so called because, although it is ancient, the first outbreak of the disease that was scientifically studied was contracted by North American soldiers patrolling near the Hantan River during the Korean War, in the 1950s. It is a known virus with several families: human transmission is only known in the so-called Andes hantavirus, which is what affected the passengers of the MV Hondius. It does not have the virulence of COVID, that of the flu or, even less so, that of measles, but the mortality rate if left untreated is indeed high. According to the World Health Organization (WHO), there are five confirmed cases, three of which have resulted in death, and three more symptomatic cases awaiting PCR results. The possibility of a ninth case has also emerged, which would be a flight attendant who was in contact with a woman who died. If confirmed, it would be worrying, as it would be the first person to have been infected without being on board the ship.