CA Dept. of Public Health UC Davis Arbovirus Research and Training Mosquito and Vector Control Assoc. of CA

Case Counts by County

CountyDead birds
Alameda2
Alpine-
Amador-
Butte5
Calaveras-
Colusa1
Contra Costa19
Del Norte-
El Dorado2
Fresno5
Glenn2
Humboldt1
Imperial-
Inyo-
Kern3
Kings1
Lake5
Lassen-
Los Angeles101
Madera1
Marin1
Mariposa-
Mendocino-
Merced1
Modoc-
Mono-
Monterey1
Napa-
Nevada1
Orange57
Placer4
Plumas-
Riverside41
Sacramento86
San Benito-
San Bernardino45
San Diego41
San Francisco1
San Joaquin7
San Luis Obispo6
San Mateo1
Santa Barbara1
Santa Clara12
Santa Cruz1
Shasta2
Sierra-
Siskiyou-
Solano4
Sonoma5
Stanislaus6
Sutter3
Tehama-
Trinity-
Tulare8
Tuolumne-
Ventura2
Yolo14
Yuba6
Total505

WNV Activity by County
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2007

Press Releases

EARLY ONSET OF WARM WEATHER TRIGGERS AN EARLY WEST NILE VIRUS SEASON

Apr 23, 2007

SACRAMENTO - Unusually high temperatures throughout the state in March triggered an earlier than normal start to the West Nile virus (WNV) season, State Public Health Officer Dr. Mark Horton warned today.

"Mosquitoes that carry West Nile virus are breeding earlier this year due to warm weather," Horton said. "While no predictions can be made about the severity of West Nile virus this season, Californians should begin taking precautions to protect themselves from mosquito bites by eliminating all sources of standing water that can support mosquito breeding and applying insect repellent containing DEET."

WNV was first detected in California five years ago. So far this year, no human cases of WNV have been identified. However, the virus has been detected in mosquito pools, sentinel chickens or horses in eight counties: Imperial, Los Angeles, Orange, Riverside, Santa Clara, San Diego, Sonoma and Stanislaus.

In 2006, a total of 292 human WNV infections, including seven deaths, were reported in the 54 counties that detected WNV activity. Of the 58 horses that also tested positive for WNV, 24 died or were euthanized. WNV is transmitted to humans and animals through a mosquito bite. Mosquitoes become infected when they feed on infected birds.

Governor Arnold Schwarzenegger has invested a total of $15 million over the last two years to enhance mosquito control efforts. This funding has supplemented the resources of existing mosquito control programs statewide and expanded efforts in areas of the state not covered to combat WNV. This investment in equipment and other products to control mosquitoes continues to benefit mosquito control efforts this year.

Horton reminded Californians of three simple ways to protect themselves from WNV:


  • DEET - Apply inspect repellent containing DEET, picaradin or oil of lemon eucalyptus according to label instructions. Repellents keep the mosquitoes from biting you. DEET can be used safely on infants and children 2 months of age and older.

  • DAWN AND DUSK - Mosquitoes that carry WNV bite in the early morning and evening so it is important to wear repellent at this time. Make sure that your doors and windows have tight-fitting screens to keep out mosquitoes. Repair or replace screens with tears or holes.

  • DRAIN - Mosquitoes lay their eggs on standing water. Eliminate all sources of standing water on your property, including flower pots, old car tires, rain gutters and pet bowls. If you have a pond, use mosquito fish or commercially available products to eliminate mosquito larvae.

California's WNV Web site - www.westnile.ca.gov - has been updated to make it easier for the public to find the latest information on WNV activity in the state. In addition to reporting all dead birds, Californians are encouraged to report dead tree squirrels, three types of which have tested positive for WNV in California: the Western Gray, Fox and Eastern Gray. The Web site also includes information on the most common birds found with WNV. Dead birds and squirrels can be reported on the Web site or by calling (877) 968-2473.

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Compared to previous year and previous five-year average to date

As of Dec 11, 2017201720165Y AVG
Counties473841
Human cases489405525
Dead birds50513471600
Mosquito samples337035193112
Sentinel chickens305343451
YTD - Year to date corresponds to the same time last year or last five years.

- view all 2016 YTD activity -

WNV Reports

Weekly Report

12.11 2017 YTD WNV Activity Map
12.06 2017 YTD SLEV Activity Map
12.05 2017 US Arboviral Activity Update

Humans

11.30 2017 Human WNV Incidence Report
11.30 2003-2017 WNV Case Summary
02.08 2016 Human WNV Incidence Report

Dead Birds

12.11Positive Counts by City/County for 2017
12.11Positive Species for 2017
12.11Reported, Tested, Positive 2017

Mosquitoes

11.09 AMOR - EVS Week 44
11.09 AMOR - GRAVID Week 44
11.09 AMOR - NJLT Week 44
- view report archives -