2015 West Nile Virus Activity

The Sacramento-Yolo Mosquito and Vector Control District's ongoing surveillance program has detected West Nile virus activity in Sacramento or Yolo counties. Archived data is available for 2007 activity, 2008, 2009, 2010, 2011, 2012, 2013, and 2014.

Download a PDF of the West Nile Risk Assessment:
Sacramento County as of 7/29/2015 - Yolo County as of 7/29/2015

For Human and Equine cases, please visit westnile.ca.gov.

West Nile virus positives total for 2015
Sacramento
County
Yolo
County
Total
Sentinel Animals000
Mosquito Samples375693
Dead Birds211637

Click here for a map of these locations

Below you will find the breakdown of West Nile virus activity

Sentinel animals tested positive for West Nile virus:
TestedCountyCityZip Code

Mosquito Samples tested positive for West Nile virus:
CollectedCountyCityZip CodeSpecies (# of Mosquitoes in Trap)
06/11/2015YoloWoodland95776Cx pipiens (45)
06/16/2015YoloDavis95618Cx pipiens (1)
06/23/2015YoloDavis95616Cx pipiens (7)
06/23/2015SacramentoElk Grove95758Cx pipiens (34)
06/30/2015SacramentoElk Grove95758Cx pipiens (8)
06/30/2015SacramentoElk Grove95758Cx pipiens (9)
06/30/2015SacramentoElk Grove95758Cx pipiens (35)
06/30/2015SacramentoSacramento95842Cx pipiens (28)
06/30/2015SacramentoSacramento95835Cx tarsalis (50)
07/02/2015SacramentoIsleton95641Cx tarsalis (50)
07/02/2015YoloKnights Landing95645Cx tarsalis (5)
07/02/2015YoloZamora95698Cx tarsalis (50)
07/07/2015SacramentoElk Grove95758Cx pipiens (50)
07/07/2015SacramentoElk Grove95758Cx pipiens (23)
07/07/2015SacramentoCarmichael95608Cx pipiens (21)
07/07/2015SacramentoSacramento95842Cx pipiens (10)
07/07/2015SacramentoSacramento95814Cx pipiens (19)
07/07/2015SacramentoRancho Cordova95670Cx pipiens (26)
07/07/2015YoloWoodland95695Cx tarsalis (39)
07/09/2015YoloZamoraCx tarsalis (50)
07/09/2015YoloZamora95698Cx tarsalis (50)
07/09/2015YoloZamora95698Cx tarsalis (50)
07/09/2015YoloWoodland95776Cx tarsalis (50)
07/09/2015YoloWoodland95776Cx tarsalis (50)
07/09/2015YoloDunnigan95937Cx tarsalis (50)
07/09/2015YoloDunnigan95937Cx tarsalis (50)
07/14/2015SacramentoElk Grove95757Cx pipiens (28)
07/14/2015SacramentoElk Grove95757Cx pipiens (27)
07/14/2015SacramentoElk Grove95758Cx pipiens (15)
07/14/2015YoloWoodland95776Cx tarsalis (50)
07/14/2015YoloWoodland95695Cx tarsalis (22)
07/14/2015SacramentoCitrus Heights95621Cx pipiens (16)
07/16/2015SacramentoIsleton95641Cx tarsalis (50)
07/16/2015YoloDunnigan95397Cx tarsalis (50)
07/16/2015YoloDunnigan95937Cx tarsalis (50)
07/16/2015YoloDunnigan95397Cx tarsalis (50)
07/16/2015YoloZamora95698Cx tarsalis (50)
07/16/2015YoloWoodland95695Cx tarsalis (50)
07/16/2015YoloKnights Landing95645Cx tarsalis (38)
07/21/2015SacramentoElk Grove95758Cx tarsalis (4)
07/21/2015SacramentoElk Grove95758Cx pipiens (8)
07/21/2015SacramentoElk Grove95757Cx pipiens (30)
07/21/2015SacramentoElk Grove95757Cx tarsalis (25)
07/21/2015SacramentoElk Grove95757Cx pipiens (37)
07/21/2015SacramentoElk Grove95758Cx pipiens (10)
07/21/2015SacramentoElk Grove95758Cx pipiens (51)
07/21/2015SacramentoElk Grove95757Cx pipiens (48)
07/21/2015SacramentoElk Grove95823Cx pipiens (50)
07/21/2015YoloDavis95618Cx pipiens (1)
07/21/2015YoloDavis95615Cx pipiens (2)
07/21/2015YoloDavis95616Cx tarsalis (50)
07/21/2015YoloDavis95616Cx tarsalis (50)
07/21/2015YoloDavis95618Cx tarsalis (50)
07/21/2015YoloDavis95618Cx tarsalis (50)
07/21/2015YoloWoodland95695Cx pipiens (6)
07/21/2015YoloWoodland95776Cx pipiens (5)
07/21/2015YoloWoodland95695Cx tarsalis (15)
07/21/2015YoloWoodland95776Cx tarsalis (50)
07/21/2015SacramentoOrangevale95662Cx pipiens (14)
07/21/2015SacramentoOrangevale95662Cx pipiens (50)
07/23/2015YoloKnights Landing95645Cx tarsalis (42)
07/23/2015YoloZamora95698Cx tarsalis (50)
07/23/2015YoloZamora95698Cx tarsalis (50)
07/23/2015YoloZamora95698Cx tarsalis (50)
07/23/2015YoloDunnigan95937Cx tarsalis (50)
07/23/2015YoloDunnigan95937Cx tarsalis (50)
07/23/2015YoloDunnigan95695Cx tarsalis (48)
07/28/2015SacramentoElk Grove95757Cx pipiens (50)
07/28/2015SacramentoElk Grove95757Cx tarsalis (50)
07/28/2015SacramentoElk Grove95757Cx pipiens (23)
07/28/2015SacramentoElk Grove95757Cx pipiens (26)
07/28/2015SacramentoElk Grove95757Cx pipiens (50)
07/28/2015SacramentoElk Grove95758Cx tarsalis (15)
07/28/2015SacramentoElk Grove95624Cx tarsalis (16)
07/28/2015YoloDavisCx tarsalis (49)
07/28/2015YoloDavis95616Cx tarsalis (36)
07/28/2015YoloDavis95618Cx tarsalis (50)
07/28/2015YoloDavis95618Cx tarsalis (50)
07/28/2015YoloDavis95616Cx tarsalis (50)
07/28/2015YoloDavis95616Cx tarsalis (50)
07/28/2015YoloDavis95616Cx tarsalis (50)
07/28/2015YoloWoodland95776Cx tarsalis (14)
07/28/2015YoloWoodland95776Cx tarsalis (50)
07/28/2015YoloWoodland95776Cx tarsalis (50)
07/28/2015Yolowoodland95776Cx tarsalis (50)
07/28/2015Yolowoodland95776Cx pipiens (6)
07/28/2015YoloWoodland95695Cx tarsalis (14)
07/28/2015YoloWoodland95695Cx pipiens (3)
07/28/2015YoloWoodland95776Cx tarsalis (50)
07/28/2015YoloWoodland95695Cx tarsalis (6)
07/28/2015YoloWoodland95695Cx pipiens (8)
07/28/2015YoloWoodland95695Cx tarsalis (50)
07/28/2015SacramentoOrangevale95662Cx pipiens (5)

Dead birds tested positive for West Nile virus:
CollectedCountyCityZip CodeSpecies
06/08/2015SacramentoIsleton95641American Crow #15-994
06/11/2015YoloDavis95616American Crow #15-1072
06/11/2015YoloDavis95616American Crow #15-1077
06/11/2015SacramentoSacramento95820American Robin #15-1087
06/17/2015SacramentoSacramento95831American Crow #15-1189
06/18/2015YoloDavis95618Western Scrub-Jay #15-1203
06/22/2015SacramentoSacramento95842American Crow #15-1252
06/22/2015SacramentoSacramento95842American Crow #15-1253
06/22/2015SacramentoSacramento95662Yellow-billed Magpie #15-1277
06/30/2015SacramentoSacramento95822Western Scrub-Jay #15-1408
07/01/2015SacramentoCitrus Heights95621Western Scrub-Jay #15-1439
07/04/2015SacramentoSacramento95831American Crow #15-1470
07/06/2015SacramentoCitrus Heights95621Western Scrub-Jay #15-1496
07/09/2015SacramentoRancho Cordova95670Western Scrub-Jay #15-1552
07/09/2015SacramentoCitrus Heights95610Western Scrub-Jay #15-1556
07/09/2015SacramentoFair Oaks95828Western Scrub-Jay #15-1567
07/10/2015YoloDavis95618American Crow #15-1581
07/09/2015YoloWest Sacramento95691American Crow #15-1582
07/11/2015SacramentoRio Linda95673Yellow-billed Magpie #15-1607
07/11/2015YoloDavis95616Yellow-billed Magpie #15-1608
07/12/2015YoloDavis95616Barn Swallow #15-1611
07/12/2015YoloDavis95618White-tailed Kite #15-1618
07/13/2015SacramentoCitrus Heights95610Western Scrub-Jay #15-1632
07/13/2015YoloDavis95616American Crow #15-1635
07/13/2015SacramentoSacramento95819American Crow #15-1637
07/13/2015YoloDavis95618Western Scrub-Jay #15-1640
07/13/2015YoloDavis95618Western Scrub-Jay #15-1641
07/11/2015SacramentoFair Oaks95628Lesser Goldfinch #15-1645
07/14/2015SacramentoElk Grove95758Western Scrub-Jay #15-1663
07/14/2015YoloDavis95616American Crow #15-1689
07/14/2015SacramentoSacramento95835American Robin #15-1690
07/17/2015SacramentoElk Grove95624Cooper's Hawk #15-1768
07/18/2015YoloDavis95616Double-crested Cormorant #15-1772
07/19/2015YoloWoodland95776American Robin #15-1785
07/21/2015YoloWoodland95776American Robin #15-1815
07/21/2015YoloDavis95616American Crow #15-1816
07/22/2015SacramentoSacramento95819American Crow #15-1833


If you see a bird, particularly a crow or magpie, lacking signs of trauma that has been dead for less than 24 hours, please call 1-877-WNV-BIRD (1-877-968-2473) or report it online here. Crows and magpies are particularly susceptible to the disease, so they make excellent early warning sentinels for virus activity in our area.