What to Know About Hantavirus — Local Risk, Response and Readiness
The World Health Organization reported eight confirmed hantavirus cases on the MV Hondius cruise ship, with three deaths, while Illinois officials investigate a possible unrelated case in Winnebago County. The Andes virus strain aboard the cruise ship is distinct from the Sin Nombre virus in North America, as it can spread person-to-person, unlike the rodent-borne strain typically found in the U.S.
The World Health Organization confirmed eight hantavirus cases linked to the MV Hondius cruise ship as of May 13, with three fatalities and one inconclusive, two probable cases. The ship, which departed Argentina in early April, carries the Andes virus, a rare strain capable of human-to-human transmission, unlike the Sin Nombre virus common in North America. In Illinois, health officials are investigating a potential hantavirus case in Winnebago County, unrelated to the cruise ship outbreak. If confirmed, it would mark the seventh case in the state since 1993. The Centers for Disease Control and Prevention documented 890 U.S. cases between 1993 and 2023, primarily linked to rodent exposure. The Andes virus differs from North American strains by targeting lung blood vessels and potentially spreading through close contact, as seen in a 2018 Argentine outbreak with 34 infections and 11 deaths. Transmission occurred at a birthday party and funeral, though symptoms like pneumonia typically appear before airborne spread. Illinois health experts note the Sin Nombre virus, carried by deer mice, is less common in the state due to its preference for arid environments like the Southwest. However, the Winnebago County case highlights risks beyond typical hotspots. Dr. William Sander, a University of Illinois professor, warned that human-wildlife interactions increase disease exposure, citing COVID-19 as a recent example. Dr. Katrine Wallace, an epidemiologist at the University of Illinois Chicago, emphasized that hantavirus spreads less easily than COVID-19, as it requires direct contact with infected fluids. She cautioned against misinformation, comparing the current climate to early pandemic fears over unproven treatments like ivermectin. Public health officials urge caution around rodents and wildlife, as hantavirus and other zoonotic diseases emerge where human and animal habitats overlap. The Winnebago County investigation continues, with results pending.
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