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West Nile Virus Update
August 2018

San Mateo County

As of August 31, 2018, there have been 291 dead birds reported in San Mateo County. Of those, 91 have been suitable for testing and five have tested positive (5%) for West Nile virus (WNV). Additionally, two mosquito pools have tested positive for WNV, both from East Palo Alto. Positive birds and pools for 2018 are summarized in the tables below. No sentinel chickens have tested positive for West Nile Virus in San Mateo County in 2018, although a sentinel chicken in Santa Clara County, near the border with San Mateo County, tested positive in August.

The District asks residents to report dead birds. Specimens that appear to have been dead for less than 24 hours and are in good condition will be tested for WNV.  Residents should contact the state WNV hotline at 877-WNV-BIRD (968-2473). Reports can also be made online at http://westnile.ca.gov.

 

 

SEASONAL TOTALS OF POSITIVE BIRDS – 2018

STREET

CITY

ZIP CODE

BIRD SPECIES

SUBMISSION DATE

Shell Blvd

Foster City

94404

American Crow

February 5, 2018

Sonora Ave.

South San Francisco

94080

American Crow

April 2, 2018

Seminary Dr.

Menlo Park

94025

American Crow

August 9, 2019

E. Bayshore Rd.

East Palo Alto

94303

American Crow

August 22, 2019

Gilbert Ave.

Menlo Park

94025

American Crow

August 28, 2018

 

SEASONAL TOTALS OF POSITIVE MOSQUITO POOLS – 2018

ADDRESS

CITY

ZIP CODE

DATE

SPECIES

Wisteria Dr.

East Palo Alto

94303

August 8, 2018

Culex tarsalis

Camellia Dr.

East Palo Alto

94303

August 10, 2018

Culex tarsalis

 California

WNV has been detected in 36 counties in 2018 (see map) compared to a five year average of 38 counties at this date. Throughout California, there have been 42 human cases of WNV, compared to a five-year average of 118 at this date. Statewide, 6,157 dead birds have been reported and 1,603 have been tested with 397 positive results (25%). 1,459 mosquito pools have tested positive for WNV this year and 84 sentinel chickens have tested positive compared to a five-year average of 2,427 positive mosquito pools and 218 positive sentinel chickens. Overall, this is a lower than average year for West Nile Virus across the state, with the highest amount of activity in Sacramento and San Joaquin counties in the central valley.

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