Droppings hantavirus

Keywords: hantavirus, micehantavirus pulmonary syndrome
Description: Two of four people have died after getting hantavirus infection at Yosemite National Park.

This content has not been reviewed within the past year and may not represent WebMD's most up-to-date information.

Aug. 29, 2012 -- Two of four people have died after getting hantavirus infection at Yosemite National Park.

About 1,700 people who visited the park from mid-June to mid-August 2012 received scary emails or letters from the National Park Service. The emails and letters warn park visitors they may have been exposed to mice carrying hantavirus -- and to look out for signs that they might have deadly hantavirus disease.

In the early 1990s, there was an outbreak of a mysterious and deadly disease in the Four Corners area of Arizona, Colorado, New Mexico, and Utah. An equally mysterious virus, dubbed Sin Nombre virus, caused the illness.

Sin Nombre virus turned out to be a member of the hantavirus family. Although other hantaviruses can cause fatal illness, none is as deadly as the Sin Nombre virus. It causes a disease called hantavirus pulmonary syndrome (HPS).

Other strains of hantavirus also cause HPS in the U.S. These include New York hantavirus in Northeastern states, and Black Creek Canal hantavirus and Bayou hantavirus in Southeastern states. By the end of 2011, 34 states reported HPS cases. The vast majority were in Western and Southwestern states.

Mice and rats spread hantaviruses among themselves. The droppings, urine, saliva, and blood of infected animals are chock-full of virus particles.

Deer mice carry the Sin Nombre strain of hantavirus. Cotton rats and rice rats carry hantavirus in the Southeast, while white-footed mice carry hantavirus in the Northeast.

Although it's possible to get hantavirus infection from a mouse or rat bite, such infections are rare. Most people get it by inhaling dust contaminated by rodent droppings or by touching rodent urine and then touching their mouth, eyes, or nose.

Getting infected is easier than it might seem. For example, you might go into your garage and scare off some mice nesting in an old cardboard box. The frightened mice leave behind a trail of urine. You pick up the mess they've left behind. You sweep up the droppings. The air fills with dust, which you breathe into your lungs.

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