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Mouse Tests Positive for Hantavirus

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Harvest mouse

December 14, 2010

A wild harvest mouse trapped during routine monitoring in Torrey Pines State Park has tested positive for the potentially-deadly hantavirus, San Diego County vector control officials said Tuesday. Twenty-one rodents, including 19 mice, have tested positive for hantavirus this year, compared to 14 in 2009.

Video: Hantavirus - The Airborne Menace

Department of Environmental Health Director Jack Miller said infected mice rarely pose a health threat to people if they remain in the wild, but that the disease can become dangerous if infected rodents get indoors and people come into contact with their droppings.

“People contract hantavirus by inhaling dust particles containing the virus from rodent droppings and nesting materials,” Miller said. “The best way to prevent the disease is to keep mice out of houses, garages and sheds.”

Hantavirus is carried by wild rodents, primarily deer mice. When the virus becomes airborne and is inhaled, it can cause hantavirus pulmonary syndrome (HPS).  HPS begins with symptoms similar to the flu, but in some cases, can lead to severe breathing difficulties and even death. There is no vaccine or specific treatment for hantavirus. 

Protecting Yourself from Hantavirus

Avoid Exposure:

  • Keep rodents out. Screen or block holes and openings that could allow infestations.
  • If you can avoid rodent-infested areas, do so. If you can’t, do not stir up dust or materials that may be contaminated with rodent droppings and urine.
  • If you rodents infest your home or living space, eliminate the infestations immediately.
  • Clean up rodent droppings and urine using the wet cleaning method described below.


Do not sweep or vacuum infested areas.  Instead, use wet cleaning methods:

  • Ventilate affected areas by opening doors and windows for at least 30 minutes.
  • Use rubber gloves. Spray a 10 percent bleach solution (2 tablespoons bleach to 1 cup of water) onto dead rodents, rodent droppings, nests, contaminated traps, and surrounding areas and let the disinfectant stand for at least 15 minutes before cleaning. Clean with a sponge or a mop.
  • Place disinfected rodents and debris into two plastic bags, seal them and discard in the trash.
  • Wash gloves in a bleach solution, then soap and water, and dispose of them using the same double-bag method. Thoroughly wash your bare hands with soap and water.

For more information, visit the County Department of Environmental Health Hantavirus web page or call (858) 694-2888.

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