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West Nile Virus Activity 2022

West Nile Virus in Los Angeles County

West Nile virus is the most common mosquito-borne disease that affects residents in Los Angeles County. Public health agencies detect West Nile virus every year in L.A. County which means it's endemic and found naturally in our city environments.

Our agency reports data related to mosquitoes. Human cases are reported by the L.A. County Department of Public Health.

The disease surveillance program serves as an early warning system in the detection of mosquito-borne viruses that can infect people and animals.

The District uses the following factors to assess health risk in your community:

  • Higher-than-average daily temperatures
  • Mosquito Population Monitoring – Using traps set up in every community
  • Mosquito Testing for Diseases
  • Dead Birds – A CA state program: Dead birds help determine spread of West Nile virus
  • Sentinel Chickens – Chickens develop antibodies to West Nile virus, which can be detected by testing.

Using these measurements, the District is able to protect your health by responding appropriately to mosquito-borne disease threats.

Year-to-Date Statistics for 2022

2022 WNV+ Mosquito Samples

City/Community Date of First DetectionPositives
Arleta7/15/20224
Artesia7/26/20225
Atwater Village10/12/20222
Avocado Heights10/7/20221
Bell Gardens8/17/20222
Bellflower6/2/20229
Boyle Heights9/9/20221
Burbank8/18/20223
Canoga Park8/4/20226
Carson8/26/20222
Cerritos7/26/20226
Chatsworth8/15/20222
Commerce8/19/20225
Cudahy 9/1/20223
Diamond Bar9/9/20221
Downey8/3/20227
Eagle Rock8/3/20225
East Los Angeles8/19/20224
El Sereno10/14/20221
Elysian Valley7/31/20223
Encino7/14/202212
Gardena9/28/20221
Glendale7/20/20227
Granada Hills 6/28/202212
Hacienda Heights6/30/2022 11
Hawaiian Gardens7/29/20227
Highland Park 8/18/20223
Hollywood Hills9/28/20222
La Habra Heights7/27/20225
La Mirada8/9/20229
Lake Balboa6/30/2022 7
Lakewood8/25/20225
Lincoln Heights8/19/20223
Long Beach7/29/20227
Los Angeles City8/4/20224
Los Feliz7/19/20227
Lynwood9/16/20223
Maywood8/17/20224
Mission Hills 7/15/2022 4
Montebello8/23/20225
North Hills7/13/20223
North Hollywood9/28/20221
Northridge6/30/20228
Norwalk 7/12/20227
Pacoima8/12/20222
Panorama City6/28/2022 10
Paramount 10/4/20222
Pico Rivera8/9/20228
Porter Ranch7/28/20222
Reseda 7/14/202210
Rowland Heights7/27/20227
San Fernando7/29/20226
San Marino7/1/202210
Santa Fe Springs7/26/20228
Sherman Oaks8/23/20226
Silver Lake9/30/20223
Signal Hill7/14/20222
South El Monte 7/13/202210
South Gate 9/1/20223
South Whittier7/26/20224
Studio City8/11/20228
Sunland8/26/20222
Sun Valley9/13/2022 2
Sylmar8/19/20221
Tarzana7/28/20223
Toluca Lake9/13/20223
Tujunga9/22/2022 1
Valley Glen8/11/20226
Valley Village8/11/20227
Van Nuys7/13/20228
Watts10/19/20221
West Hills8/24/20223
Whittier6/30/202214
Wilmington9/14/20221
Winnetka8/4/20228
Woodland Hills8/24/20224
 Total # of Positive Mosquito Samples This Year357

2022 WNV+ Dead Birds

City/CommunityDate of First Detection Positives
Bellflower7/22/2022 1
Cerritos8/9/20224
Diamond Bar10/7/20221
Glendale7/26/20221
Hacienda Heights10/11/20221
Northridge7/1/20221
North Hills5/26/20223
Norwalk7/11/20221
La Cresenta-Montrose6/7/20221
Lakewood9/13/20221
Long Beach9/14/20224
Los Angeles8/23/20222
Panorama City7/14/20221
San Marino7/28/2022 2
Sherman Oaks7/18/2022 2
Whittier 8/12/20222
 Total # of Positive Dead Birds this Year27

Take a look at mosquito and disease activity throughout California by utilizing the VectorSurv map! 

To experience the full site, visit: VectorSurv.org 

 

Did you know Los Angeles County is serviced by five vector control districts?

Visit our Other Agencies page to find your local vector control district.