• Rainbow over Half Dome

    Yosemite

    National Park California

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  • Temporary Closures Due to Fire

    All main roads within Yosemite National Park, including the Big Oak Flat Road, are open. Crane Flat, Bridalveil Creek, and Yosemite Creek Campgrounds are temporarily closed. The community of Foresta remains closed. More »

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?

Riparian area in Tuolumne Meadows

Riparian communities are adjacent to the river channel and tributaries; they are the interface between the river and surrounding meadow and upland communities. They provide specialized habitat and important nutrients to the meadow and river systems.