Your County Government Community
Kids & Families
Environment Public Safety Jobs

County News

Latest News
County Recognition
County Television Network
Board Of Supervisors Meeting Video
Public Information Officers
County Officials Contact List

Related Links

Hantavirus Info

Fourth Hantavirus Case Confirmed

Printer Friendly
Font Size Extra Large Font Size Large Font Size Default

October 29, 2008

County Vector Control confirmed today that one wild mouse trapped during routine monitoring at the west side of Mission Trails Regional Park in Tierrasanta has tested positive for Hantavirus.

It is the fourth case this year. Typically, the County confirms between two and eight cases.

Hantavirus is carried by wild rodents, primarily deer mice. It is found in rodent droppings and urine and can be inhaled by humans when it becomes airborne. The airborne virus can cause a rare illness called Hantavirus pulmonary syndrome, or HPS.

Early signs of the illness are similar to the flu, including fatigue, fever, muscle aches, headache, dizziness, chills, nausea, vomiting, diarrhea and abdominal pain. Later symptoms of HPS include coughing and shortness of breath rapidly progressing to severe difficulty in breathing. It can sometimes be fatal.

“As the weather begins to cool, rodents may seek shelter inside residences. Mice can fit through openings as small as a dime, so be sure to cover or fill in those holes and gaps that might allow them to enter a home or building.” said Gary Erbeck, director of the Department of Environmental Health. “If you do have rodent droppings inside, be sure to protect yourself by using the wet cleaning method.”

Residents should not sweep or vacuum rodent droppings and urine. Use the method below:

  • Ventilate affected area 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 waste into two plastic bags, seal them and discard in the trash.
  • Wash gloves in the 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, please visit the County’s Vector Control Web site at, or call at (858) 694-2888.

Get County news e-mailed to you.