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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
Artesia7/26/20224
Bell Gardens8/17/20222
Bellflower6/2/20227
Boyle Heights9/9/20221
Burbank8/18/20222
Canoga Park8/4/20223
Carson8/26/20221
Cerritos7/26/20225
Chatsworth8/15/20222
Commerce8/19/20222
Cudahy 9/1/20223
Diamond Bar9/9/20221
Downey8/3/20226
Eagle Rock8/3/20224
East Los Angeles8/19/20222
Elysian Valley7/31/20221
Encino7/14/20229
Glendale7/20/20223
Granada Hills 6/28/202211
Hacienda Heights6/30/2022 8
Hawaiian Gardens7/29/20224
Highland Park 8/18/20221
La Habra Heights7/27/20224
La Mirada8/9/20225
Lake Balboa6/30/2022 6
Lakewood8/25/20223
Lincoln Heights8/19/20221
Long Beach7/29/20224
Los Angeles City8/4/20221
Los Feliz7/19/20223
Lynwood9/16/20221
Maywood8/17/20222
Mission Hills 7/15/2022 4
Montebello8/23/20222
North Hills7/13/20223
Northridge6/30/20228
Norwalk 7/12/20225
Pacoima8/12/20221
Panorama City6/28/2022 10
Pico Rivera8/9/20224
Porter Ranch7/28/20222
Reseda 7/14/20228
Rowland Heights7/27/20225
San Fernando7/29/20223
San Marino7/1/20229
Santa Fe Springs7/26/20227
Sherman Oaks8/23/20222
Signal Hill7/14/20221
South El Monte 7/13/20225
South Gate 9/1/20222
South Whittier7/26/20223
Studio City8/11/20224
Sunland8/26/20221
Sun Valley9/13/2022 1
Sylmar8/19/20221
Tarzana7/28/20222
Toluca Lake9/13/20221
Valley Glen8/11/20225
Valley Village8/11/20225
Van Nuys7/13/20227
West Hills8/24/20222
Whittier6/30/202211
Wilmington9/14/20221
Winnetka8/4/20226
Woodland Hills8/24/20222
 Total # of Positive Mosquito Samples This Year249

2022 WNV+ Dead Birds

City/CommunityDate of First Detection Positives
Bellflower7/22/2022 1
Cerritos8/9/20223
Glendale7/26/20221
Northridge7/1/20221
North Hills5/26/20223
Norwalk7/11/20221
La Cresenta-Montrose6/7/20221
Lakewood9/13/20221
Long Beach9/14/20221
Los Angeles8/23/20221
Panorama City7/14/20221
San Marino7/28/2022 2
Sherman Oaks7/18/2022 2
Whittier 8/12/20222
 Total # of Positive Dead Birds this Year21

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.