West Nile Virus Statistics

WNV Activity From Mosquito Samples and Dead Birds

2014 Activity Summary

Case Breakdown 2014
Mosquito Samples 141
Dead Birds 10
Chickens 17
Humans* 12 (0**)

Page updated August, 2014

*Number of people within GLACVCD jurisdiction. Get county-wide data at County of LA Public Health

**fatalities

Please click on the following links to jump down to the appropriate data:

2014 Monthly Mosquito Samples

2014 Monthly Dead Birds

2014 Monthly Chickens

Data from Previous Years


2014 Monthly Mosquito Samples

Mosquito Testing Disease surveillance is conducted to detect St. Louis encephalitis (SLE), Western equine encephalomyelitis (WEE) and West Nile virus (WNV) transmission within District boundaries. Initial surveillance begins by setting mosquito traps to collect adult mosquitoes for identification. Because they require a blood meal to produce eggs and are involved in the disease transmission cycle, only female mosquitoes are submitted for virus testing. Ten to 50 live anesthetized female mosquitoes are deposited into vials to comprise a mosquito pool. These pools are stored at minus 70 degrees Celsius and shipped to the University of Davis Arbovirus Research Unit (DARU) for testing. Nearly every community in the District's jurisdiction has at least one mosquito trap.

Samples recorded below are when they were reported.

May 2014

City or Community Zip Code(s) Number of WNV+ mosquito samples collected
Sherman Oaks 91403 1
Total: 1

June 2014

City or Community Zip Code(s) Number of WNV+ mosquito samples collected
Sherman Oaks 91403

1

Diamond Bar 91789 1
Total: 2

July 2014

City or Community Zip Code(s) Number of WNV+ mosquito samples collected
Bell Gardens 90201 1
Bellflower 90706 1
Canoga Park 91304, 91306

3

Carson 90747 1
Diamond Bar 91765,91789 4
Downey 90241 1
Encino 91436 2
Hacienda Heights 91745 2
La Habra Heights 90631 2
Lakewood 90713 1
La Mirada 90638 1
Lincoln Heights 90031 1
Long Beach 90808 1
North Hills 91343 2
Northridge 91325, 91326 3
Pico Rivera 90660 1
Panorama City 91402 2
Reseda 91335 2
Rowland Heights 91748 2
San Marino 91108 1
Sherman Oaks 91403, 91423 2
Van Nuys 91406 2
Total: 38

August 2014

City or Community Zip Code(s) Number of WNV+ mosquito samples collected
Arleta 91331 2
Artesia 90701 2
Athens Village - LA Co. 90061 1
Bell Gardens 90201 1
Canoga Park 91303, 91304, 91306 5
Carson 90706 1
Cerritos 90703 2
Chatsworth 91311 3
Diamond Bar 91789 1
Encino 91436,91316 4
Gardena 90247 2
Glendale 91201 1
Grenada Hills 91344 1
Hacienda Heights 91745 2
Hawaiian Gardens 90716 1
La Habra Heights 90631 1
Lake Balboa 91406 2
La Mirada 90638 5
Lakewood 90703, 90712 4
Long Beach 90808 2
Lynwood 90262 2
Maywood 90270 1
Mission Hills 91345 2
Montebello 90640 3
North Hills 91406 1
Northridge 91325 2
Norwalk 90650 1
Paramount 90723 1
Panorama City 91402 1
Pico Rivera 90660 4
Reseda 91335 2
Rowland Heights 91748 2
San Marino 91108 4
Santa Fe Springs 90670 4
Sherman Oaks 91423 2
South Central - LA 90011 1
South Whittier - LA County 90605 2
South El Monte 91733 1
Studio City - LA 91604 2
Sylmar - LA 91342 1
Tarzana 91356 1
Toluca Lake 91602 1
Valley Glen 91401 2
Valley Village 91607 2
Van Nuys 91402 1
Watts 90002 1
West Hills 91307 2
Whittier 90602, 90604, 90605 4
Wilmington 90744 1
Winnetka 91306 2
Woodland Hills 91367 1
Total: 100

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2014 Monthly Summary - Dead Birds

Dead Bird Surveillance Program Wild birds are the animals from which mosquitoes primarily acquire West Nile virus. Although many birds that are infected with WNV will not appear ill, WNV can cause serious illness and death in some birds. The most severe illnesses are seen among the corvids (including crows, jays, ravens, and magpies). Dead American Crows are the most commonly reported bird infected with WNV. If you find a bird that has recently died, particularly a crow or other corvid, please contact Westnile.ca.gov.

Numbers recorded below are when they were reported.

March 2014 Dead Birds

City or Community Zip Code(s) WNV+ dead bird
Long Beach 90808 2
Total: 2

June 2014 Dead Birds

City or Community Zip Code(s) WNV+ dead bird
Hacienda Heights 91745 1
Total: 1

July 2014 Dead Birds

City or Community Zip Code(s) WNV+ dead bird
San Marino 91108 1
Total: 1

August 2014 Dead Birds

City or Community Zip Code(s) WNV+ dead bird
Cerritos 90703 2
Long Beach 90808 1
Northridge 91108 2
West Hills 91307 1
Total: 6

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2014 Monthly Summary - Chickens

Sentinel Chicken Testing The sentinel chicken flocks also serve as an early warning indicator system for detection of SLE, WEE, and WNV transmitted by mosquitoes that can potentially infect people and animals. Blood samples are taken bi-weekly from the sentinel chickens and analyzed by the state health department's Viral and Rickettsial Disease Lab to determine the presence of virus antibodies, indicating whether mosquitoes in the area have transmitted a virus. This early detection allows the opportunity to prevent the occurrence of human infections. The Vector Ecologists maintain seven chicken flocks throughout the District year-round.

Numbers recorded below are when they were reported.

July 2014 Chickens

City or Community Zip Code(s) WNV+ dead bird
Long Beach 90815 5
Total: 5

August 2014 Chickens

City or Community Zip Code(s) WNV+ dead bird
Long Beach 90815 3
Rowland Heights 91748 9
Total: 12

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Yearly Activity Summary

Case Breakdown 2008 2009 2010 2011 2012 2013
Mosquito Samples 472 91 56 448 318 393
Dead Birds 259 38 31 159 70 75
Chickens 37 0 0 40 26 50
Humans* 83(15**) 8(1) 1 44 (2) 95 (2) 104 (5)

*Numbers indicate how many people tested positive for West Nile virus within GLACVCD. For Los Angeles County-wide numbers, please visit the County of Los Angeles Public Health website

**fatalities

Up-to-date West Nile virus statistics for all counties in California and additional information can be viewed at the CA Department of Public Health website. Just visit www.westnile.ca.gov.

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District Programs

There are a number of Mosquito Species and Mosquito-Borne Diseases known to occur within the Greater Los Angeles County Vector Control District.

Click here to learn more.