West Nile virus Activity Continues into Fall


WNV Update – 10/9/20 PDF

LOS ANGELES (October 9, 2020) – The Greater Los Angeles County Vector Control District has confirmed 26 additional mosquito samples positive for West Nile virus (WNV) this week. This brings the total number of samples positive for the virus within the district’s service area to 264 samples this year. The mosquito samples all stem from areas previously identified as positive for West Nile virus.

City/Community Date First Detected #WNV Positive Mosquito Samples to Date this Year
Arleta 8/06/2020 4
Artesia 8/12/2020 3
Bell 8/11/2020 4
Bell Gardens 7/14/2020 4
Bellflower 7/14/2020 7
Burbank 7/14/2020 5
Canoga Park 7/22/2020 6
Carson 9/16/2020 1
Cerritos 8/12/2020 3
Commerce 7/30/2020 3
Diamond Bar 9/4/2020 1
Downey 7/14/2020 8
East Los Angeles 7/30/2020 4
Encino 7/15/2020 14
Gardena 9/16/2020 1
Glendale 8/25/2020 2
Granada Hills 8/13/2020 2
Florence-Firestone 8/14/2020 2
Hacienda Heights 5/20/2020 3
Hawaiian Gardens 9/3/2020 1
Hollywood Hills 9/10/2020 2
Huntington Park 8/25/2020 2
La Habra Heights 8/21/2020 2
La Mirada 7/15/2020 4
Lakewood 7/23/2020 6
Long Beach 8/06/2020 2
Los Feliz 7/29/2020 2
Lynwood 8/11/2020 3
Maywood 8/25/2020 2
Montebello 7/29/2020 8
Northridge 7/21/2020 6
Norwalk 8/26/2020 4
North Hills 7/15/2020 4
North Hollywood 6/18/2020 14
Pacoima 9/4/2020 1
Pico Rivera 6/15/2020 12
Panorama City 7/15/2020 6
Paramount 9/9/2020 1
Porter Ranch 7/21/2020 3
Rowland Heights 7/10/2020 1
Santa Fe Springs 7/15/2020 6
Sherman Oaks 6/11/2020 8
Signal Hill 7/09/2020 5
South Gate 7/28/2020 2
Studio City 6/18/2020 10
Sunland 7/24/2020 1
Sylmar 8/21/2020 2
Tarzana 7/21/2020 5
Toluca Lake 6/18/2020 10
Valley Glen 6/18/2020 5
Valley Village 6/18/2020 13
Van Nuys 7/02/2020 12
West Hills 8/05/2020 3
Whittier 7/15/2020 7
Wilmington 8/05/2020 1
Winnetka 7/07/2020 7
Woodland Hills 6/17/2020 3

**Additional Detections are ITALICIZED**

West Nile virus is endemic in Los Angeles County, and warm temperatures can increase virus activity and mosquito populations. As of October 2nd, 93 WNV human cases have been reported in California this year, 27 of which were identified by LADPH. Visit CalSurv Maps for a comprehensive look at this year’s West Nile virus activity throughout Los Angeles County and Southern California. 

“The warm fall temperatures help West Nile virus and mosquito season continue later into the year,” said Anais Medina Diaz, public information officer for GLACVCD. “Residents need to continue practicing mosquito control in their homes by eliminating standing water and wearing insect repellent to protect themselves.”

Follow the tips below to prevent mosquito bites:

  • Apply mosquito repellent to exposed skin before going outdoors and reapply as recommended on the label.
  • Wear insect repellent containing CDC and EPA approved active ingredients: DEET®, Picaridin, IR3535, or oil of lemon eucalyptus.
  • Wear light-colored, long-sleeved shirts and long pants.
  • Close or repair all unscreened doors and windows to prevent mosquitoes from entering the home.

Follow the tips below to reduce mosquito populations on your property:

  • Eliminate standing water in clogged rain gutters, rain barrels, discarded tires, buckets, watering troughs, or anything that holds water for more than a week.
  • Ensure that swimming pools, spas, and ponds are properly maintained.
  • Change the water in pet dishes, birdbaths, and other small containers weekly.
  • Request mosquitofish from your local vector control district for placement in ornamental ponds.
  • Report neglected (green) swimming pools in your neighborhood to your vector control district.

For more information on how to prevent mosquito breeding on your property, join the District’s Mosquito Watch program, a neighborhood watch program designed to empower residents and provide the tools needed to protect our communities from mosquitoes and mosquito-borne diseases. For additional resources, visit: www.tiptosstakeaction.org. Residents can also contact the Greater Los Angeles County Vector Control District at www.glacvcd.org for additional mosquito-related questions. Follow @GLAmosquito on Facebook, Instagram, and Twitter.


About West Nile virus:
WNV is transmitted to people and animals through the bite of an infected mosquito. There is no cure for WNV. One in five persons infected with the virus will exhibit symptoms.  Symptoms can include fever, headache, body aches, nausea, or a skin rash. These symptoms can last for several days to months. One in 150 people infected with the virus will require hospitalization. Severe symptoms include high fever, muscle weakness, neck stiffness, coma, paralysis, and possibly death.

The Greater Los Angeles County Vector Control District is a public health service agency formed under the authority of the California State Health & Safety Code. Our mission is to reduce populations of public health vectors below nuisance levels and prevent human infection associated with mosquito-transmitted diseases. 

Anais Medina Diaz, Public Information Officer | [email protected]