• View of Half Dome and Washington Column in Yosemite Valley

    Yosemite

    National Park California

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  • Tioga Road is Closed

    The Tioga Road (Highway 120 through the park) is closed due to snow; there is no estimated opening date, although it usually opens sometime in May. More »

  • Rain and snow is forecast Friday and Saturday

    The Glacier Point Road is closed and will be reevaluated on Sunday. Tire chains may be required; bring and be prepared to use them if visiting this weekend. Check current road conditions by calling 209/372-0200 (then dial 1 then 1).

Hantavirus in Yosemite

Hantavirus is a rare but serious disease that humans can contract through contact with infected rodents or their urine, saliva, blood, or droppings. Since HPS was first identified in the United States in 1993, there have been 62 cases in California residents and over 600 cases nationally. Approximately 12 percent of deer mice carry hantavirus.

The deer mouse (Peromyscus maniculatus) is the primary reservoir for Sin Nombre Virus, the strain of hantavirus responsible for the human cases in Yosemite National Park, and most human cases in the United States. The deer mouse is found throughout most of the United States, including Yosemite National Park.

For additional information on preventing HPS, visit the Centers for Disease Control and Prevention (CDC) hantavirus website or California Department of Public Health (CDPH) website.


View frequently asked questions about hantavirus in Yosemite.

News releases and updates


General information about hantavirus


Information for health care providers

Did You Know?

NatureBridge students learning something new from their instructor.

For over 40 years, NatureBridge has served over 40,000 youth and adults annually through a unique variety of environmental education programs at their national park campuses in California and Washington, including their Yosemite National Park campus.