How does Andes hantavirus spread between people?

In April 2026, a passenger boarded a Dutch cruise ship in Ushuaia, Argentina after a bird-watching trip. Ten days later, he died. The cause of his death, while initially unclear, was determined to be Andes hantavirus (ANDV), which he picked up prior to boarding the ship. His wife, sickened by the same virus, later died as well.