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 Detection	Positives
Arleta	7/15/2022	4
Artesia	7/26/2022	5
Atwater Village	10/12/2022	2
Avocado Heights	10/7/2022	1
Bell Gardens	8/17/2022	2
Bellflower	6/2/2022	9
Boyle Heights	9/9/2022	1
Burbank	8/18/2022	3
Canoga Park	8/4/2022	6
Carson	8/26/2022	2
Cerritos	7/26/2022	6
Chatsworth	8/15/2022	2
Commerce	8/19/2022	5
Cudahy	9/1/2022	3
Diamond Bar	9/9/2022	1
Downey	8/3/2022	7
Eagle Rock	8/3/2022	5
East Los Angeles	8/19/2022	4
El Sereno	10/14/2022	1
Elysian Valley	7/31/2022	3
Encino	7/14/2022	12
Gardena	9/28/2022	1
Glendale	7/20/2022	7
Granada Hills	6/28/2022	12
Hacienda Heights	6/30/2022	11
Hawaiian Gardens	7/29/2022	7
Highland Park	8/18/2022	3
Hollywood Hills	9/28/2022	2
La Habra Heights	7/27/2022	5
La Mirada	8/9/2022	9
Lake Balboa	6/30/2022	7
Lakewood	8/25/2022	5
Lincoln Heights	8/19/2022	3
Long Beach	7/29/2022	7
Los Angeles City	8/4/2022	4
Los Feliz	7/19/2022	7
Lynwood	9/16/2022	3
Maywood	8/17/2022	4
Mission Hills	7/15/2022	4
Montebello	8/23/2022	5
North Hills	7/13/2022	3
North Hollywood	9/28/2022	1
Northridge	6/30/2022	8
Norwalk	7/12/2022	7
Pacoima	8/12/2022	2
Panorama City	6/28/2022	10
Paramount	10/4/2022	2
Pico Rivera	8/9/2022	8
Porter Ranch	7/28/2022	2
Reseda	7/14/2022	10
Rowland Heights	7/27/2022	7
San Fernando	7/29/2022	6
San Marino	7/1/2022	10
Santa Fe Springs	7/26/2022	8
Sherman Oaks	8/23/2022	6
Silver Lake	9/30/2022	3
Signal Hill	7/14/2022	2
South El Monte	7/13/2022	10
South Gate	9/1/2022	3
South Whittier	7/26/2022	4
Studio City	8/11/2022	8
Sunland	8/26/2022	2
Sun Valley	9/13/2022	2
Sylmar	8/19/2022	1
Tarzana	7/28/2022	3
Toluca Lake	9/13/2022	3
Tujunga	9/22/2022	1
Valley Glen	8/11/2022	6
Valley Village	8/11/2022	7
Van Nuys	7/13/2022	8
Watts	10/19/2022	1
West Hills	8/24/2022	3
Whittier	6/30/2022	14
Wilmington	9/14/2022	1
Winnetka	8/4/2022	8
Woodland Hills	8/24/2022	4
	Total # of Positive Mosquito Samples This Year	357

2022 WNV+ Dead Birds

City/Community	Date of First Detection	Positives
Bellflower	7/22/2022	1
Cerritos	8/9/2022	4
Diamond Bar	10/7/2022	1
Glendale	7/26/2022	1
Hacienda Heights	10/11/2022	1
Northridge	7/1/2022	1
North Hills	5/26/2022	3
Norwalk	7/11/2022	1
La Cresenta-Montrose	6/7/2022	1
Lakewood	9/13/2022	1
Long Beach	9/14/2022	4
Los Angeles	8/23/2022	2
Panorama City	7/14/2022	1
San Marino	7/28/2022	2
Sherman Oaks	7/18/2022	2
Whittier	8/12/2022	2
	Total # of Positive Dead Birds this Year	27