The recent hantavirus outbreak aboard the MV Hondius, a luxury expedition cruise ship that departed from Ushuaia, Argentina, has raised alarm after three passengers died. The outbreak is attributed to the Andes strain of hantavirus, which is endemic to South America. Unlike most hantaviruses that primarily spread through rodent contact, the Andes strain can transmit between humans, albeit rarely and only through close, prolonged contact, such as intimate caregiving. Symptoms of infection can start with flu-like signs, progressing rapidly to severe respiratory issues, including hantavirus pulmonary syndrome. The Centers for Disease Control and Prevention (CDC) notes that the Andes strain is particularly deadly and lacks both a vaccine and effective treatment options. Experts emphasize the challenge of managing the virus due to its long incubation period, complicating efforts to identify and track those exposed. Dr. Sabra Klein from Johns Hopkins University highlighted that transmission has been documented primarily among intimate partners, underscoring the need for caution in close-contact settings.