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 Angeles100
Madera1
Marin1
Mariposa-
Mendocino-
Merced1
Modoc-
Mono-
Monterey1
Napa-
Nevada1
Orange55
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
Total502

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 Nov 17, 2017201720165Y AVG
Counties473841
Human cases465395504
Dead birds50213461592
Mosquito samples336035063104
Sentinel chickens304343448
YTD - Year to date corresponds to the same time last year or last five years.

- view all 2016 YTD activity -

WNV Reports

Weekly Report

11.17 Arbovirus Bulletin #33
11.17 2017 YTD WNV Activity Map
11.14 2017 US Arboviral Activity Update

Humans

11.15 2017 Human WNV Incidence Report
11.15 2003-2017 WNV Case Summary
02.08 2016 Human WNV Incidence Report

Dead Birds

11.17Positive Counts by City/County for 2017
11.17Positive Species for 2017
11.17Reported, 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 -