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

Case Counts by County

CountyDead birds
Alameda8
Alpine-
Amador-
Butte-
Calaveras-
Colusa-
Contra Costa-
Del Norte-
El Dorado2
Fresno-
Glenn-
Humboldt1
Imperial-
Inyo-
Kern-
Kings-
Lake-
Lassen-
Los Angeles2
Madera-
Marin-
Mariposa-
Mendocino-
Merced-
Modoc-
Mono-
Monterey-
Napa-
Nevada-
Orange-
Placer2
Plumas-
Riverside2
Sacramento67
San Benito-
San Bernardino-
San Diego-
San Francisco-
San Joaquin1
San Luis Obispo-
San Mateo2
Santa Barbara-
Santa Clara13
Santa Cruz1
Shasta-
Sierra-
Siskiyou-
Solano-
Sonoma-
Stanislaus1
Sutter-
Tehama-
Trinity-
Tulare-
Tuolumne-
Ventura-
Yolo6
Yuba-
Total108

WNV Activity by County
Printable Version
2018 | 2017 | 2016 | 2015 | 2014
2013 | 2012 | 2011
2010 | 2009 | 2008
2007

Press Releases

CDPH Confirms First Human West Nile Virus Illnesses of 2018

Jun 15, 2018

SACRAMENTO - The California Department of Public Health (CDPH) announced today the first confirmed illnesses in California due to West Nile virus (WNV). The four illnesses occurred in Los Angeles, Kern and Riverside Counties. "West Nile virus activity in the state is increasing, so I urge Californians to take every possible precaution to protect against mosquito bites," said CDPH Director and State Public Health Officer Dr. Karen Smith.

West Nile virus is transmitted to humans and animals by the bite of an infected mosquito. As of June 8, 2018, WNV has been detected in 14 dead birds from seven counties and four mosquito samples from three counties. Hot temperatures this month are contributing to increasing numbers of mosquitoes and the increased risk of virus transmission to humans. So far this season, activity is within expected levels. The risk of disease due to WNV usually increases at this time of year and is highest throughout the summer and early fall. West Nile virus is influenced by many factors, including climate, the number and types of birds and mosquitoes in an area, and the level of WNV immunity in birds. The risk of serious illness to most people is low. However, some individuals - less than one percent - can develop serious neurologic illnesses such as encephalitis or meningitis. In 2017, there were 553 reported WNV cases in California, including 44 deaths. People 50 years of age and older, and individuals with diabetes or hypertension, have a higher chance of getting sick and are more likely to develop complications from WNV infection.

CDPH recommends that individuals protect against mosquito bites and WNV by practicing the "Three Ds":

1. DEET - Apply insect repellent containing DEET, picaradin, oil of lemon eucalyptus or IR3535 according to label instructions. Repellents keep the mosquitoes from biting you. Insect repellents should not be used on children under two months of age.

2. DAWN AND DUSK - Mosquitoes that transmit WNV usually bite in the early morning and evening so it is important to wear proper clothing and repellent if outside during these times. Make sure that your doors and windows have tight-fitting screens to keep out mosquitoes. Repair or replace screens that have tears or holes.

3. DRAIN - Mosquitoes lay their eggs on standing water. Eliminate all sources of standing water on your property by emptying flower pots, old car tires, buckets, and other containers. If you know of a swimming pool that is not being properly maintained, please contact your local mosquito and vector control agency.

California's West Nile virus website includes the latest information on WNV activity in the state. Californians are encouraged to report dead birds on the website or by calling toll-free 1-877-WNV-BIRD (968-2473).

Downloads


Having problems with mosquitoes?

Locate your local mosquito and vector control agency
Search by Zip Code







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

As of Jul 20, 2018201820175Y AVG
Counties242531
Human cases1044
Dead birds10890387
Mosquito samples315895827
Sentinel chickens72127
YTD - Year to date corresponds to the same time last year or last five years.

- view all 2018 YTD activity -

WNV Reports

Weekly Report

07.20 ARbovirus Bulletin #16
07.20 2018 YTD SLEV Activity Map
07.20 2018 YTD WNV Activity Map

Humans

07.12 2018 Human WNV Incidence Report
07.12 2003-2018 WNV Case Summary
03.29 2017 Human WNV Incidence Report

Dead Birds

07.20Reported, Tested, Positive 2018
07.20Positive Species for 2018
07.20Positive Counts by City/County for 2018

Mosquitoes

07.20 AMOR - EVS Week 28
07.20 AMOR - GRAVID Week 28
07.20 AMOR - NJLT Week 28
- view report archives -