2018 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 2018. 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 2018
Sacramento
County
Yolo
County
Total
Sentinel Animals000
Mosquito Samples1427149
Dead Birds67673

View a map of West Nile Virus Activity

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)
05/30/2018SacramentoElk Grove95624Cx tarsalis (50)
06/07/2018SacramentoElk Grove95757Cx pipiens (50)
06/15/2018SacramentoRancho Cordova95670Cx pipiens (39)
06/19/2018SacramentoSacramento95822Cx pipiens (50)
06/19/2018SacramentoSacramento95832Cx pipiens (28)
06/19/2018SacramentoSacramento95822Cx pipiens (45)
06/19/2018SacramentoSacramento95815Cx tarsalis (9)
06/19/2018SacramentoSacramento95815Cx pipiens (38)
06/19/2018SacramentoSacramento95660Cx pipiens (50)
06/19/2018SacramentoSacramento95842Cx pipiens (13)
06/19/2018SacramentoSacramento95835Cx pipiens (50)
06/19/2018SacramentoSacramento95831Cx pipiens (50)
06/19/2018SacramentoSacramento95831Cx pipiens (50)
06/26/2018SacramentoSacramento95822Cx pipiens (19)
06/26/2018SacramentoSacramento95822Cx pipiens (50)
06/26/2018SacramentoSacramento, CA95838Cx pipiens (30)
06/26/2018SacramentoSacramento, CA95838Cx pipiens (50)
06/26/2018SacramentoSacramento95831Cx pipiens (50)
06/26/2018SacramentoElk Grove95757Cx pipiens (31)
06/26/2018SacramentoElk Grove95624Cx pipiens (50)
06/26/2018SacramentoElk Grove95624Cx pipiens (43)
06/26/2018SacramentoElk Grove95758Cx pipiens (50)
06/28/2018SacramentoSacramento95831Cx pipiens (50)
06/28/2018SacramentoSacramento95831Cx pipiens (50)
06/29/2018SacramentoElk Grove95624Cx tarsalis (19)
06/29/2018SacramentoElk Grove95624Cx pipiens (50)
06/28/2018SacramentoElk Grove95757Cx pipiens (37)
06/28/2018SacramentoCitrus Heights95621Cx pipiens (9)
06/28/2018SacramentoFolsom95630Cx tarsalis (5)
06/28/2018SacramentoGalt95632Cx tarsalis (1)
06/28/2018SacramentoWilton95693Cx tarsalis (1)
06/28/2018SacramentoWilton95693Cx tarsalis (30)
07/02/2018SacramentoElk Grove95757Cx pipiens (2)
07/02/2018SacramentoElk Grove95757Cx pipiens (50)
07/02/2018SacramentoSacramento95815Cx pipiens (26)
07/02/2018SacramentoSacramento, CA95838Cx tarsalis (50)
07/02/2018SacramentoSacramento, CA95838Cx tarsalis (50)
07/02/2018SacramentoSacramento, CA95838Cx tarsalis (50)
07/02/2018SacramentoSacramento, CA95838Cx pipiens (50)
07/02/2018YoloDavis95616Cx pipiens (26)
07/02/2018SacramentoSacramento95831Cx pipiens (50)
07/02/2018SacramentoSacramento95831Cx pipiens (50)
07/02/2018SacramentoSacramento95831Cx pipiens (50)
07/02/2018SacramentoElk Grove95624Cx pipiens (50)
07/06/2018SacramentoFair Oaks95628Cx pipiens (8)
07/06/2018SacramentoCitrus Heights95621Cx pipiens (50)
07/06/2018SacramentoCitrus Heights95621Cx pipiens (50)
07/10/2018SacramentoElk Grove95758Cx pipiens (29)
07/10/2018SacramentoSacramento95831Cx pipiens (50)
07/10/2018SacramentoSacramento95831Cx pipiens (32)
07/10/2018SacramentoElk Grove95757Cx pipiens (50)
07/10/2018SacramentoElk Grove95757Cx pipiens (9)
07/10/2018SacramentoSacramento95831Cx pipiens (49)
07/10/2018SacramentoElk Grove95624Cx pipiens (18)
07/10/2018SacramentoElk Grove95624Cx tarsalis (11)
07/10/2018SacramentoElk Grove95624Cx pipiens (50)
07/10/2018SacramentoElk Grove95624Cx pipiens (20)
07/10/2018SacramentoElk Grove95624Cx pipiens (27)
07/10/2018SacramentoElk Grove95823Cx tarsalis (50)
07/10/2018SacramentoElk Grove95624Cx pipiens (50)
07/10/2018YoloDavis95618Cx pipiens (3)
07/10/2018SacramentoSacramento95831Cx pipiens (43)
07/10/2018SacramentoSacramento95819Cx pipiens (23)
07/10/2018SacramentoSacramento95832Cx pipiens (50)
07/10/2018SacramentoSacramento95822Cx pipiens (50)
07/10/2018SacramentoSacramento95842Cx tarsalis (1)
07/10/2018SacramentoSacramento95842Cx pipiens (50)
07/10/2018SacramentoSacramento95842Cx pipiens (50)
07/10/2018SacramentoSacramento95815Cx pipiens (25)
07/10/2018SacramentoSacramento95833Cx pipiens (52)
07/10/2018SacramentoElk Grove95758Cx pipiens (50)
07/10/2018SacramentoElk Grove95758Cx pipiens (50)
07/10/2018SacramentoElk Grove95758Cx pipiens (50)
07/10/2018SacramentoElk Grove95758Cx pipiens (50)
07/10/2018SacramentoElk Grove95758Cx pipiens (50)
07/10/2018SacramentoSacramento95828Cx tarsalis (29)
07/10/2018SacramentoSacramento95828Cx pipiens (50)
07/10/2018SacramentoSacramento95828Cx pipiens (31)
07/13/2018SacramentoElk Grove95624Cx pipiens (50)
07/13/2018SacramentoElk Grove95624Cx pipiens (4)
07/13/2018SacramentoSacramento95823Cx tarsalis (50)
07/13/2018SacramentoSacramento95823Cx pipiens (50)
07/13/2018SacramentoSacramento95823Cx pipiens (43)
07/13/2018SacramentoSacramento95823Cx pipiens (18)
07/13/2018SacramentoElk Grove95757Cx pipiens (14)
07/13/2018SacramentoElk Grove95757Cx tarsalis (1)
07/13/2018SacramentoElk Grove95757Cx pipiens (50)
07/13/2018SacramentoElk Grove95757Cx pipiens (50)
07/13/2018SacramentoElk Grove95757Cx pipiens (50)
07/13/2018SacramentoCitrus Heights95621Cx tarsalis (14)
07/13/2018SacramentoCitrus Heights95621Cx pipiens (6)
07/13/2018SacramentoCitrus Heights95621Cx pipiens (10)
07/13/2018SacramentoRancho Cordova95670Cx pipiens (10)
07/13/2018SacramentoWilton95693Cx tarsalis (3)
07/13/2018SacramentoWilton95693Cx tarsalis (6)
07/13/2018SacramentoWilton95693Cx pipiens (19)
07/13/2018SacramentoGalt95632Cx pipiens (1)
07/13/2018YoloWoodland95695Cx pipiens (9)
07/13/2018YoloWoodland95776Cx tarsalis (50)
07/17/2018SacramentoSacramento95828Cx tarsalis (4)
07/17/2018SacramentoSacramento95828Cx pipiens (50)
07/17/2018SacramentoSacramento95828Cx pipiens (15)
07/17/2018SacramentoSacramento95828Cx pipiens (6)
07/17/2018SacramentoElk Grove95758Cx pipiens (16)
07/17/2018YoloDavis95618Cx pipiens (8)
07/17/2018YoloDavis95616Cx pipiens (50)
07/17/2018YoloDavis95616Cx pipiens (7)
07/17/2018SacramentoSacramento95819Cx pipiens (43)
07/17/2018SacramentoSacramento95828Cx pipiens (50)
07/17/2018SacramentoSacramento95822Cx pipiens (50)
07/17/2018SacramentoSacramento95822Cx pipiens (29)
07/17/2018SacramentoSacramento95833Cx pipiens (4)
07/17/2018SacramentoSacramento95842Cx pipiens (9)
07/17/2018SacramentoSacramento95842Cx pipiens (22)
07/17/2018SacramentoSacramento95815Cx tarsalis (50)
07/17/2018SacramentoSacramento, CA95838Cx pipiens (50)
07/17/2018SacramentoSacramento, CA95838Cx pipiens (29)
07/17/2018SacramentoSacramento95837Cx tarsalis (50)
07/17/2018SacramentoSacramento95828Cx tarsalis (10)
07/17/2018SacramentoSacramento95828Cx pipiens (21)
07/17/2018SacramentoSacramento95828Cx pipiens (50)
07/17/2018SacramentoElk Grove95624Cx pipiens (18)
07/17/2018SacramentoElk Grove95624Cx tarsalis (9)
07/17/2018SacramentoElk Grove95624Cx pipiens (50)
07/17/2018SacramentoElk Grove95624Cx pipiens (50)
07/17/2018SacramentoElk Grove95624Cx pipiens (23)
07/19/2018SacramentoCx pipiens (19)
07/19/2018SacramentoElk Grove95624Cx pipiens (7)
07/19/2018SacramentoElk Grove95757Cx pipiens (34)
07/19/2018SacramentoElk Grove95823Cx pipiens (42)
07/19/2018SacramentoElk Grove95823Cx pipiens (28)
07/19/2018SacramentoElk Grove95757Cx pipiens (35)
07/19/2018SacramentoSacramento95832Cx pipiens (12)
07/19/2018SacramentoElk Grove95624Cx pipiens (14)
07/19/2018SacramentoSacramento95831Cx pipiens (6)
07/19/2018SacramentoSacramento95831Cx pipiens (37)
07/19/2018SacramentoSacramento95822Cx tarsalis (4)
07/19/2018SacramentoElk Grove95758Cx pipiens (50)
07/19/2018SacramentoElk Grove95758Cx pipiens (50)
07/19/2018SacramentoSacramento95831Cx pipiens (50)
07/19/2018SacramentoSacramento95831Cx pipiens (50)
07/19/2018SacramentoSacramento95823Cx tarsalis (7)
07/19/2018SacramentoSacramento95823Cx pipiens (50)
07/19/2018SacramentoSacramento95823Cx pipiens (49)
07/19/2018SacramentoSacramento95831Cx tarsalis (10)
07/19/2018SacramentoSacramento95831Cx pipiens (50)
07/19/2018SacramentoSacramento95831Cx pipiens (50)
07/19/2018SacramentoSacramento95831Cx pipiens (50)
07/19/2018SacramentoSacramento95831Cx pipiens (50)

Dead birds tested positive for West Nile virus:
CollectedCountyCityZip CodeSpecies
05/23/2018SacramentoSacramento95815American Crow #18-379
05/31/2018SacramentoSacramento95822American Crow #18-456
05/31/2018SacramentoElk Grove95624California Scrub-Jay #18-463
06/06/2018SacramentoSacramento95825Yellow-billed Magpie #18-572
06/13/2018SacramentoSacramento95815American Crow #18-624
06/13/2018SacramentoFair Oaks95628California Scrub-Jay #18-626
06/20/2018SacramentoElk Grove95624California Scrub-Jay #18-754
06/20/2018SacramentoSacramento95831American Crow #18-742
06/27/2018SacramentoElk Grove95624Northern Mockingbird #18-849
06/27/2018SacramentoSacramento95821American Crow #18-853
06/27/2018SacramentoElk Grove95624California Scrub-Jay #18-859
06/27/2018SacramentoElk Grove95624Cooper's Hawk #18-864
06/27/2018YoloWest Sacramento95691American Crow #18-871
07/02/2018SacramentoSacramento95815American Crow #18-881
07/02/2018SacramentoSacramento95822California Scrub-Jay #18-916
07/02/2018SacramentoSacramento95822California Scrub-Jay #18-917
07/02/2018SacramentoElk Grove95624American Robin #18-919
07/02/2018SacramentoSacramento95821Northern Mockingbird #18-921
07/02/2018SacramentoSacramento95831American Crow #18-923
07/02/2018SacramentoElk Grove95624California Scrub-Jay #18-929
07/02/2018SacramentoSacramento95814Cooper's Hawk #18-930
07/02/2018SacramentoSacramento95822California Scrub-Jay #18-932
07/02/2018YoloWest Sacramento95691Nuttall's Woodpecker #18-936
07/04/2018SacramentoSacramento95818American Crow #18-943
07/04/2018SacramentoSacramento95621California Scrub-Jay #18-949
07/04/2018SacramentoSacramento95816Anna's Hummingbird #18-958
07/04/2018SacramentoElk Grove95624Lesser Goldfinch #18-964
07/04/2018SacramentoSacramento95831American Crow #18-969
07/09/2018YoloWest Sacramento95691American Robin #18-987
07/09/2018SacramentoElk Grove95624Anna's Hummingbird #18-988
07/09/2018SacramentoSacramento95831American Crow #18-993
07/09/2018SacramentoElk Grove95624American Robin #18-996
07/09/2018SacramentoSacramento95821American Crow #18-1001
07/11/2018SacramentoSacramento95829California Scrub-Jay #18-1007
07/11/2018SacramentoFair Oaks95628California Scrub-Jay #18-1010
07/11/2018YoloWest Sacramento95691American Crow #18-1026
07/11/2018SacramentoSacramento95814American Crow #18-1027
07/11/2018YoloWest Sacramento95691American Crow #18-1037
07/11/2018SacramentoSacramento95834Lesser Goldfinch #18-1040
07/11/2018SacramentoSacramento95821Yellow-billed Magpie #18-1043
07/11/2018SacramentoElk Grove95624American Crow #18-1048
07/16/2018SacramentoSacramento95838American Crow #18-1031
07/16/2018SacramentoSacramento95831California Scrub-Jay #18-1049
07/16/2018SacramentoCarmichael95608Yellow-billed Magpie #18-1050
07/16/2018SacramentoFair Oaks95628Yellow-billed Magpie #18-1051
07/16/2018SacramentoNorth Highlands95660Cooper's Hawk #18-1069
07/16/2018SacramentoSacramento95815Yellow-billed Magpie #18-1070
07/16/2018SacramentoCitrus Heights95621American Crow #18-1095
07/16/2018SacramentoSacramento95821Cooper's Hawk #18-1108
07/16/2018SacramentoSacramento95831American Crow #18-1109
07/16/2018SacramentoSacramento95815Yellow-billed Magpie #18-1112
07/16/2018SacramentoSacramento95693Red-shouldered Hawk #18-1119
07/16/2018SacramentoSacramento95825Yellow-billed Magpie #18-1129
07/18/2018SacramentoCarmichael95608California Scrub-Jay #18-1138
07/18/2018SacramentoGalt95632California Scrub-Jay #18-1139
07/18/2018SacramentoElk Grove95624Northern Mockingbird #18-1140
07/18/2018SacramentoElk Grove95624Northern Mockingbird #18-1141
07/18/2018SacramentoRancho Cordova95670California Scrub-Jay #18-1144
07/18/2018SacramentoSacramento95831American Crow #18-1147
07/18/2018SacramentoSacramento95831California Scrub-Jay #18-1152
07/18/2018SacramentoSacramento95831California Scrub-Jay #18-1154
07/18/2018SacramentoSacramento95610Northern Mockingbird #18-1156
07/18/2018SacramentoSacramento95821American Crow #18-1158
07/18/2018SacramentoSacramento95842California Scrub-Jay #18-1167
07/18/2018SacramentoSacramento95831American Crow #18-1189
07/18/2018SacramentoSacramento95628California Scrub-Jay #18-1190
07/18/2018SacramentoElk Grove95624California Scrub-Jay #18-1191
07/18/2018SacramentoSacramento95826American Robin #18-1192
07/18/2018SacramentoSacramento95818American Crow #18-1195
07/18/2018SacramentoSacramento95819Northern Mockingbird #18-1196
07/18/2018YoloDavis95616California Scrub-Jay #18-1197
07/18/2018SacramentoSacramento95821American Robin #18-1198
07/18/2018SacramentoRancho Cordova95670California Scrub-Jay #18-1203


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.