California is joining a global effort to locate passengers who recently got off a cruise ship linked to a hantavirus outbreak that has proven fatal.
Three individuals—two from the Netherlands and one from Germany—have died, while at least eight others fell ill aboard the MV Hondius, which was operated by Oceanwide Expeditions based in the Netherlands.
Officials mention that over 20 passengers left the ship nearly two weeks after the initial death occurred, yet comprehensive contact tracing has not been completed.
Health experts are actively working to find these individuals to assess if any secondary infections have taken place.
State health officials have confirmed that a resident from California was on the cruise and is currently being monitored as a precaution.
So far, there are no reported cases of Californians testing positive or showing symptoms, but they remain under observation as part of broader health monitoring efforts.
Investigators suspect that the outbreak could have begun even before the cruise itself, with Argentine health authorities focusing on a southern region where a Dutch couple reportedly contracted the virus during an earlier birdwatching outing prior to boarding the ship.
The World Health Organization has stated that the overall public risk is low. Typically, hantaviruses are spread through inhaling particles from infected rodent droppings and are not usually passed between humans.
However, a strain known as the Andes variant, found in South America, is recognized for allowing limited human-to-human transmission, which has raised some concerns.
In the U.S., hantaviruses are rare but considerably hazardous.
Since the CDC began tracking these cases in 1993, over 300 deaths have been reported. From 1993 to 2023, 890 infections have been confirmed across the country, with a mortality rate of over 34%.
States most impacted include New Mexico, Colorado, Arizona, California, and Washington.
California has seen about 80 to 90 cases total and 24 fatalities, averaging around three cases annually. Most infections in the state have been linked to rural mountainous areas like the Sierra Nevada, where deer mice are carriers of the Sin Nombre virus.
This particular strain makes up the bulk of U.S. infections and is not known to transfer between humans, in contrast to the South American variant currently under scrutiny tied to the cruise ship outbreak.
Authorities are diligently tracking passengers who have returned from the cruise across various continents, including the U.S., while identifying new cases and ascertaining whether the virus has spread beyond the ship remains a top priority.
Officials emphasize that, despite ongoing international search efforts, there is currently no evidence of widespread infection.
