2017 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 in 2017. Archived data is available for 2007 activity, 2008, 2009, 2010, 2011, 2012, 2013, 2014, 2015, and 2016.



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

West Nile virus positives total for 2017
Sacramento
County
Yolo
County
Total
Sentinel Animals000
Mosquito Samples6733100
Dead Birds40141

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)
06/08/2017SacramentoIsleton95641Cx pipiens (1)
06/08/2017YoloWoodland95695Cx tarsalis (23)
07/04/2017SacramentoSacramento95826Cx pipiens (10)
07/11/2017SacramentoSouth Watt Avenue95829Cx tarsalis (14)
07/11/2017SacramentoSacramento95833Cx pipiens (22)
07/11/2017YoloDavis95618Cx tarsalis (50)
07/11/2017YoloDavis95618Cx tarsalis (50)
07/13/2017SacramentoIsleton95641Cx tarsalis (50)
07/13/2017SacramentoGalt95632Cx tarsalis (10)
07/18/2017SacramentoSouth Watt Avenue95829Cx pipiens (10)
07/18/2017SacramentoSacramento95829Cx tarsalis (50)
07/18/2017SacramentoSacramento95829Cx tarsalis (50)
07/18/2017SacramentoSacramento95829Cx tarsalis (50)
07/18/2017SacramentoSacramento95829Cx pipiens (19)
07/18/2017SacramentoRancho Cordova95826Cx pipiens (15)
07/18/2017SacramentoElk Grove95624Cx pipiens (7)
07/18/2017SacramentoSacramento95832Cx tarsalis (3)
07/20/2017SacramentoElk Grove95757Cx pipiens (39)
07/25/2017SacramentoSacramento95829Cx tarsalis (50)
07/25/2017SacramentoSacramento95829Cx pipiens (3)
07/25/2017SacramentoSacramento95826Cx pipiens (39)
07/25/2017SacramentoSacramento95826Cx pipiens (9)
07/25/2017SacramentoSacramento95826Cx tarsalis (5)
07/25/2017SacramentoSacramento95826Cx pipiens (4)
07/25/2017SacramentoElk Grove95757Cx tarsalis (50)
07/25/2017YoloDavis95618Cx tarsalis (50)
07/27/2017SacramentoIsleton95641Cx pipiens (16)
07/27/2017YoloKnights Landing95645Cx tarsalis (50)
07/27/2017YoloWoodland95695Cx tarsalis (50)
07/27/2017YoloWoodland95695Cx pipiens (25)
07/27/2017YoloWoodland95695Cx tarsalis (50)
07/27/2017SacramentoElk Grove95757Cx pipiens (40)
07/27/2017SacramentoElk Grove95757Cx tarsalis (50)
07/27/2017SacramentoSacramento95835Cx tarsalis (50)
08/01/2017SacramentoSacramento95826Cx tarsalis (28)
08/01/2017SacramentoSacramento95826Cx pipiens (8)
08/01/2017SacramentoSouth Watt Avenue95829Cx tarsalis (37)
08/01/2017SacramentoSacramento95829Cx tarsalis (22)
08/01/2017SacramentoElk Grove95624Cx tarsalis (25)
08/01/2017SacramentoElk Grove95624Cx pipiens (28)
08/01/2017SacramentoElk Grove95757Cx pipiens (50)
08/01/2017YoloDavis95618Cx tarsalis (50)
08/01/2017YoloDavis95616Cx tarsalis (50)
08/01/2017SacramentoSacramento95864Cx pipiens (11)
08/01/2017SacramentoSacramento95825Cx tarsalis (24)
08/01/2017SacramentoSacramento95660Cx pipiens (37)
08/03/2017SacramentoIsleton95641Cx tarsalis (50)
08/03/2017SacramentoIsleton95641Cx tarsalis (50)
08/03/2017SacramentoSacramento95835Cx tarsalis (50)
08/03/2017SacramentoElk Grove95757Cx tarsalis (50)
08/03/2017SacramentoElk Grove95757Cx tarsalis (16)
08/03/2017SacramentoElk GroveCx tarsalis (21)
08/03/2017SacramentoElk Grove95757Cx pipiens (50)
08/03/2017Yolowoodland95695Cx tarsalis (50)
08/03/2017Yolowoodland95695Cx tarsalis (43)
08/03/2017SacramentoHood95757Cx tarsalis (45)
08/03/2017SacramentoHood95757Cx pipiens (24)
08/03/2017SacramentoNorth Highlands95660Cx pipiens (3)
08/03/2017YoloDunnigan95937Cx tarsalis (50)
08/03/2017YoloZamora95698Cx tarsalis (50)
08/03/2017SacramentoElk Grove95757Cx pipiens (5)
08/03/2017YoloKnights Landing95645Cx tarsalis (50)
08/08/2017SacramentoRancho Cordova95670Cx pipiens (5)
08/08/2017SacramentoElk Grove95757Cx pipiens (24)
08/08/2017SacramentoElk Grove95757Cx pipiens (8)
08/08/2017SacramentoElk Grove95757Cx pipiens (42)
08/08/2017SacramentoElk Grove95758Cx pipiens (21)
08/08/2017YoloDavis95618Cx tarsalis (50)
08/08/2017YoloDavis95618Cx tarsalis (50)
08/08/2017YoloDavis95616Cx tarsalis (50)
08/08/2017SacramentoSacramento95825Cx tarsalis (16)
08/10/2017SacramentoElk Grove95757Cx pipiens (50)
08/10/2017SacramentoElk Grove95757Cx pipiens (31)
08/10/2017SacramentoElk GroveCx tarsalis (50)
08/10/2017SacramentoElk GroveCx pipiens (50)
08/10/2017SacramentoElk GroveCx pipiens (50)
08/10/2017SacramentoElk GroveCx pipiens (50)
08/10/2017SacramentoElk Grove95757Cx pipiens (3)
08/10/2017YoloWoodland95695Cx tarsalis (40)
08/10/2017SacramentoSacramento95835Cx tarsalis (50)
08/10/2017YoloWoodland95776Cx tarsalis (50)
08/10/2017YoloYolo95695Cx tarsalis (50)
08/10/2017YoloZamora95698Cx tarsalis (38)
08/10/2017YoloKnights Landing95645Cx tarsalis (50)
08/10/2017YoloDunnigan95937Cx tarsalis (50)
08/10/2017YoloDunnigan95937Cx tarsalis (50)
08/10/2017SacramentoGalt95632Cx pipiens (4)
08/10/2017SacramentoWilton95693Cx tarsalis (28)
08/15/2017SacramentoSacramento95819Cx pipiens (10)
08/17/2017YoloYolo95695Cx tarsalis (33)
08/17/2017YoloDunnigan95937Cx tarsalis (50)
08/17/2017YoloDunnigan95937Cx tarsalis (50)
08/17/2017YoloDunnigan95937Cx tarsalis (50)
08/17/2017YoloWoodland95695Cx tarsalis (19)
08/17/2017SacramentoSacramento95835Cx pipiens (41)
08/17/2017Yolowoodland95776Cx tarsalis (26)
08/17/2017YoloWoodland95695Cx tarsalis (50)
08/17/2017YoloWoodland95695Cx tarsalis (46)
08/17/2017SacramentoWilton95693Cx tarsalis (50)
08/17/2017SacramentoWilton95693Cx tarsalis (20)

Dead birds tested positive for West Nile virus:
CollectedCountyCityZip CodeSpecies
12/31/1969SacramentoFolsom95630Red-shouldered Hawk #17-280
12/31/1969SacramentoGalt95632Western Scrub-Jay #17-429
12/31/1969SacramentoSacramento95826American Crow #17-431
12/31/1969SacramentoSacramento95829Black Phoebe #17-471
12/31/1969SacramentoGalt95632Western Scrub-Jay #17-487
12/31/1969SacramentoCarmichael95608Western Scrub-Jay #17-552
12/31/1969SacramentoSacramento95826American Crow #17-590
12/31/1969SacramentoSacramento95826Yellow-billed Magpie #17-634
12/31/1969SacramentoSacramento95823House Finch #17-636
12/31/1969SacramentoRosemont95826Western Scrub-Jay #17-669
12/31/1969SacramentoSacramento95826American Crow #17-964
12/31/1969SacramentoSacramento95826American Crow #17-999
12/31/1969SacramentoSacramento95825Yellow-billed Magpie #17-1001
12/31/1969SacramentoRosemont95826American Crow #17-1004
12/31/1969SacramentoSacramento95829Red-shouldered Hawk #17-1009
12/31/1969SacramentoSacramento95826American Crow #17-1040
12/31/1969SacramentoSacramento95864Yellow-billed Magpie #17-1062
12/31/1969SacramentoGalt95632Western Scrub-Jay #17-1132
12/31/1969SacramentoSacramento95826American Crow #17-1165
12/31/1969SacramentoCarmichael95608American Crow #17-1177
12/31/1969SacramentoCarmichael95608Yellow-billed Magpie #17-1217
12/31/1969SacramentoSacramento95821American Crow #17-1268
12/31/1969SacramentoSacramento95827Yellow-billed Magpie #17-1270
12/31/1969SacramentoRosemont95826American Crow #17-1290
12/31/1969SacramentoSacramento95826Lesser Goldfinch #17-1302
12/31/1969SacramentoSacramento95841American Crow #17-1305
12/31/1969SacramentoSacramento95864Western Scrub-Jay #17-1325
12/31/1969SacramentoSacramento95826Western Scrub-Jay #17-1355
12/31/1969SacramentoRancho Cordova95670Western Scrub-Jay #17-1359
12/31/1969SacramentoSacramento95826Lesser Goldfinch #17-1362
12/31/1969SacramentoSacramento95826House Finch #17-1365
12/31/1969SacramentoSacramento95826Western Scrub-Jay #17-1368
12/31/1969SacramentoRancho Cordova95670Western Scrub-Jay #17-1425
12/31/1969SacramentoSacramento95826American Crow #17-1442
12/31/1969SacramentoRio Linda95673American Crow #17-1451
12/31/1969SacramentoRosemont95826Western Scrub-Jay #17-1491
12/31/1969SacramentoElk Grove95624Western Scrub-Jay #17-1515
12/31/1969YoloDavis95616American Crow #17-1537
12/31/1969SacramentoSacramento95831American Crow #17-1544
12/31/1969SacramentoElk Grove95757Northern Mockingbird #17-1560
12/31/1969SacramentoWilton95693Barn Owl #17-1602


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.