Northern Nevada has experienced record levels of rain and snow this winter. All of this water will mean an increase in mosquitoes and potentially the spread of mosquito-borne diseases like West Nile Virus. Here are a few tips and resources to help Northern Nevadans prevent the spread of mosquitoes and West Nile Virus.


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At-Home Mosquito Prevention

Mosquitoes like warm, outdoor areas with stagnant water. The best way to prevent mosquitoes from breeding near your home is to remove excess water and use screens on doors and windows.


Learn more about controlling mosquitoes at home!

Mosquito Bite Prevention

Using an EPA-approved insect repellent, wearing protective clothing, and staying indoors during peak mosquito hours can help you prevent getting mosquito bites!

insect repellents

West Nile Virus

West Nile Virus infection is a mosquito-borne virus and is closely related to St. Louis encephalitis (SLE) virus. In 1999, the first confirmed cases in the United States were all recorded in New York City. Since then, confirmed cases of WNV in animals and humans have occurred in all of the lower 48 states including Nevada.


West Nile virus is spread through the bite of infected mosquitoes, which acquire the virus by feeding on infected birds. The illness is not spread person to person. Many people with the virus will have no symptoms or very mild flu-like illness. Mild symptoms include fever, headache, body aches, nausea, vomiting and sometimes swollen lymph glands or a skin rash on the chest, stomach, and back.
Less than 1% of people who are infected will develop a serious neurologic illness, such as encephalitis or meningitis (inflammation of the brain or surrounding tissues). The symptoms of neurologic illness can include headache, high fever, neck stiffness, disorientation, coma, tremors, seizures, or paralysis. If you are experiencing this type of illness, it is important to seek medical treatment.fight-the-bite
The most effective way to avoid West Nile virus disease is to prevent mosquito bites. CCHHS and DCMA advise Nevadans and visitors to take the following precautions to prevent West Nile virus throughout the summer months:

  • Use insect repellents when you go outdoors. Repellents containing DEET, picaridin, IR3535, and some oil of lemon eucalyptus and para-menthane-diol products provide longer-lasting protection. More information about insect repellents can be found at
  • When weather permits, wear long sleeves, long pants, and socks when outdoors. Mosquitoes may bite through thin clothing, so spraying clothes with repellent containing permethrin or another EPA-registered repellent will give extra protection. Don’t apply repellents containing permethrin directly to skin. Do not spray repellent on the skin under your clothing.
  • Take extra care during peak mosquito biting hours. Take extra care to use repellent and protective clothing from dusk to dawn or consider avoiding outdoor activities during these times.
  • Mosquito-proof your home. Install or repair screens on windows and doors to keep mosquitoes outside. Use your air conditioning, if you have it. Empty standing water from flowerpots, gutters, buckets, pool covers, pet water dishes, discarded tires, and birdbaths on a regular basis.

Visit our West Nile Virus page for more information!

West Nile Virus Resources

4 Ways to Prevent Mosquito Bites Graphic_English

West Nile Virus Fact Sheet – English

4 Ways to Prevent Mosquito Bites Graphic_SPANISH

West Nile Virus Fact Sheet – Spanish

News and Information

July 5, 2017 – Washoe County Has First Positive Pool of West Nile Virus Learn More

For Healthcare Providers

June 7, 2017 – Technical Bulletin (NV Div of Public and Behavioral Health) West Nile Virus: Update for Healthcare Providers

CCHHS Environmental Health – Vector Control

The CCHHS environmental health specialists and other vector control professionals in neighboring counties routinely survey known breeding sources for mosquitoes and trap them for identification.

Contact Us at (775) 887-2190 or for questions/concerns about West Nile Virus or mosquitos in the area.

Douglas County Mosquito Abatement District
Lyon County Mosquito Abatement Districts