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

Case Counts by County

CountyDead birds
Alameda16
Alpine-
Amador-
Butte3
Calaveras-
Colusa-
Contra Costa11
Del Norte-
El Dorado2
Fresno-
Glenn-
Humboldt1
Imperial-
Inyo-
Kern-
Kings-
Lake-
Lassen-
Los Angeles9
Madera-
Marin-
Mariposa-
Mendocino-
Merced-
Modoc-
Mono-
Monterey-
Napa-
Nevada-
Orange5
Placer40
Plumas-
Riverside5
Sacramento232
San Benito-
San Bernardino-
San Diego-
San Francisco-
San Joaquin11
San Luis Obispo-
San Mateo5
Santa Barbara-
Santa Clara43
Santa Cruz2
Shasta4
Sierra-
Siskiyou-
Solano-
Sonoma-
Stanislaus1
Sutter4
Tehama-
Trinity-
Tulare-
Tuolumne-
Ventura-
Yolo36
Yuba-
Total430

WNV Activity by County
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2010 | 2009 | 2008
2007

Press Releases

Californians Urged to Remove Standing Water to Reduce Mosquitoes

May 15, 2017

SACRAMENTO - The California Department of Public Health (CDPH) urges all Californians to eliminate standing water around their homes and businesses to help reduce mosquito populations in an effort to prevent Zika and West Nile virus infections.

"As the rainy season comes to an end and temperatures rise, we will see increased mosquito activity," said CDPH Director and State Public Health Officer Dr. Smith. "Residents should dump out containers that hold standing water in and around their homes and businesses. Removing water will help reduce overall mosquito numbers and protect family members and neighbors from mosquito bites and mosquito-borne diseases."

Mosquitoes breed in very small amounts of water. To help keep their numbers down, Californians should frequently check for, and eliminate, water-filled containers, clean and scrub bird baths and pet watering dishes, and dump water from dishes under potted plants. Residents are also urged to report unusual numbers of mosquitoes or day-biting mosquitoes to the local vector control agency.

With mosquito activity increasing, Californians should also protect themselves from mosquito bites at home and while traveling to areas where the Zika virus is present. To prevent bites, consistently use mosquito repellent when outside, wear long sleeves and pants, use air conditioning, and make sure window screens will keep mosquitoes out of the home.

"It is particularly important for pregnant women and couples planning to become pregnant to prevent mosquito bites because Zika virus can cause miscarriage, stillbirth, and severe birth defects if a pregnant woman becomes infected," said Dr. Smith.

Zika virus is spread primarily through mosquito bites and can also be transmitted by both men and women during sex. Most people who are infected with Zika virus do not experience any symptoms but should take precautions to avoid sexual transmission, even if they never had symptoms. Zika symptoms include fever, rash, joint pain and red eyes.

All individuals, particularly women of childbearing age, should take steps to protect themselves against mosquito bites while traveling and when they return home. Sexually active people who travel to areas with Zika virus transmission should use condoms or other barriers to avoid getting or passing Zika virus during sex. There has been no local transmission of Zika in California to date, but the mosquitoes that can carry Zika virus live in many areas of California.

West Nile virus (WNV) is also transmitted to humans and animals by the bite of an infected mosquito. WNV can cause a deadly infection in humans, and the elderly are particularly susceptible. WNV symptoms may include fever, headache, body aches, nausea, vomiting, and sometimes swollen lymph glands or a skin rash on the chest, stomach, and back. More severe symptoms, and even death, can occur. The state's first human infection of WNV this year was reported last month.

Visit the CDPH website for more information about mosquitoes, Zika and West Nile. Additional mosquito prevention information is available at www.cdc.gov.

www.cdph.ca.gov

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

As of Sep 14, 2018201820175Y AVG
Counties373939
Human cases79143188
Dead birds4303371087
Mosquito samples173029792773
Sentinel chickens112204277
YTD - Year to date corresponds to the same time last year or last five years.

- view all 2018 YTD activity -

WNV Reports

Weekly Report

09.14 Arbovirus Bulletin #24
09.14 2018 YTD SLEV Activity Map
09.14 2018 YTD WNV Activity Map

Humans

09.10 2018 Human WNV Incidence Report
09.05 2003-2018 WNV Case Summary
03.29 2017 Human WNV Incidence Report

Dead Birds

09.14Reported, Tested, Positive 2018
09.14Positive Species for 2018
09.14Positive Counts by City/County for 2018

Mosquitoes

09.14 AMOR - EVS Week 36
09.14 AMOR - GRAVID Week 36
09.14 AMOR - NJLT Week 36
- view report archives -