Hantavirus surveillance for United States.
Sin Nombre virus is endemic across the U.S. West with deer mice as the primary reservoir. Cases concentrate in Arizona, New Mexico, Colorado, Utah, and California, often tied to occupational or recreational exposure in rural settings.
Active surveillance. Sin Nombre virus cases occur sporadically across the U.S. Southwest and Pacific states, typically 20-40 confirmed cases per year nationally. Currently monitoring 7 returning Hondius passengers, none symptomatic.
The dominant hantavirus species in United States is Sin Nombre. See the strain reference for detail on transmission, mortality and reservoir biology.