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West Nile Virus Surveillance Update
June 7, 2017

San Mateo County

As of June 6, 2017, there have been 134 dead birds reported in San Mateo County. Of those, 21 have been suitable for testing and 1 has tested positive (5%) for West Nile Virus (WNV). No dead squirrels or mosquito pools have been tested for West Nile Virus in San Mateo County thus far this year.

The district asks residents to call in to report dead birds or tree squirrels.  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.

California

WNV has been detected in eleven counties in 2017 (see map), compared to a five year average of twelve counties at this date. One human case of West Nile Virus has been reported in California from Kings County Statewide, 2,336 birds have been reported and 448 have been tested with 11 positive results (3%).  29 mosquito pools have tested positive for West Nile Virus, compared to a five-year average of 42 positive mosquito pools at this time. No positive sentinel chickens have yet been reported in California. 

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