2016 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, 2014, and 2015.

Download a PDF of the West Nile Risk Assessment:
Sacramento County as of 6/23/2016 - Yolo County as of 6/23/2016

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

West Nile virus positives total for 2016
Sacramento
County
Yolo
County
Total
Sentinel Animals000
Mosquito Samples1254129
Dead Birds1372139

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)
06/01/2016SacramentoSacramento95825Cx pipiens (32)
06/01/2016SacramentoSacramento95864Cx tarsalis (20)
06/01/2016SacramentoSacramento95660Cx pipiens (15)
06/07/2016SacramentoSacramento95864Cx pipiens (50)
06/07/2016SacramentoSacramento95864Cx pipiens (26)
06/07/2016SacramentoSacramento95825Cx pipiens (8)
06/07/2016SacramentoSacramento95825Cx pipiens (5)
06/07/2016SacramentoSacramento95864Cx pipiens (25)
06/07/2016SacramentoSacramento95826Cx pipiens (42)
06/07/2016SacramentoSacramento95660Cx pipiens (6)
06/07/2016SacramentoSacramento95821Cx pipiens (40)
06/07/2016SacramentoSacramento95660Cx pipiens (16)
06/07/2016SacramentoSacramento95864Cx pipiens (50)
06/07/2016SacramentoSacramento95864Cx pipiens (23)
06/07/2016SacramentoSacramento95841Cx pipiens (49)
06/07/2016SacramentoNorth Highlands95660Cx pipiens (20)
06/14/2016SacramentoSacramento95864Cx pipiens (42)
06/14/2016SacramentoSacramento95864Cx pipiens (6)
06/14/2016SacramentoCarmichael95608Cx pipiens (50)
06/14/2016SacramentoCarmichael95608Cx pipiens (26)
06/14/2016SacramentoSacramento95825Cx pipiens (10)
06/14/2016SacramentoSacramento95815Cx pipiens (13)
06/14/2016SacramentoCarmichael95608Cx tarsalis (7)
06/14/2016SacramentoSacramento95821Cx tarsalis (30)
06/14/2016SacramentoFair Oaks95628Cx pipiens (6)
06/14/2016SacramentoNorth Highlands95660Cx tarsalis (7)
06/14/2016SacramentoNorth Highlands95660Cx pipiens (16)
06/14/2016SacramentoFair Oaks95628Cx pipiens (3)
06/14/2016SacramentoFair Oaks95628Cx pipiens (18)
06/14/2016SacramentoSacramento, CA95842Cx pipiens (12)
06/16/2016SacramentoSacramento95825Cx pipiens (14)
06/16/2016SacramentoSacramento95825Cx pipiens (50)
06/16/2016SacramentoSacramento95825Cx pipiens (13)
06/16/2016SacramentoCarmichael95608Cx tarsalis (20)
06/16/2016SacramentoCx pipiens (50)
06/16/2016SacramentoCarmichael95608Cx pipiens (50)
06/19/2016SacramentoSacramento95841Cx pipiens (20)
06/19/2016SacramentoCarmichael95608Cx pipiens (50)
06/19/2016SacramentoCarmichael95608Cx pipiens (22)
06/19/2016SacramentoCarmichael95608Cx pipiens (50)
06/19/2016SacramentoCarmichael95608Cx pipiens (35)
06/19/2016SacramentoCarmichaelCx pipiens (17)
06/19/2016SacramentoCarmichaelCx pipiens (9)
06/19/2016SacramentoSacramento95825Cx pipiens (50)
06/19/2016SacramentoSacramento95825Cx pipiens (40)
06/19/2016SacramentoSacramento95825Cx pipiens (50)
06/19/2016SacramentoSacramento95821Cx pipiens (14)
06/21/2016SacramentoCarmichael95608Cx tarsalis (6)
06/21/2016SacramentoFair Oaks95628Cx tarsalis (36)
06/21/2016SacramentoFair Oaks95628Cx pipiens (28)
06/21/2016SacramentoFair Oaks95628Cx tarsalis (47)
06/21/2016SacramentoFair Oaks95628Cx pipiens (11)
06/21/2016SacramentoFair Oaks95628Cx pipiens (25)
06/21/2016SacramentoFair Oaks95628Cx pipiens (9)
06/21/2016SacramentoSacramento95826Cx tarsalis (50)
06/21/2016SacramentoSacramento95826Cx pipiens (11)
06/21/2016SacramentoSacramento95826Cx pipiens (50)
06/21/2016SacramentoSacramento95826Cx pipiens (5)
06/21/2016SacramentoNorth Highlands95660Cx tarsalis (50)
06/22/2016SacramentoSacramento95819Cx pipiens (25)
06/22/2016SacramentoElk Grove95624Cx tarsalis (27)
06/22/2016SacramentoElk Grove95624Cx pipiens (6)
06/22/2016SacramentoElk Grove95624Cx tarsalis (14)
06/22/2016SacramentoElk Grove95624Cx tarsalis (21)
06/22/2016SacramentoElk Grove95758Cx pipiens (3)
06/22/2016YoloWoodland95776Cx tarsalis (50)
06/22/2016SacramentoSacramento95833Cx pipiens (19)
06/22/2016SacramentoSacramento95828Cx pipiens (7)
06/22/2016SacramentoSouth Watt Avenue95829Cx pipiens (12)
06/22/2016SacramentoSacramento, CA95838Cx tarsalis (5)
06/22/2016YoloWinters95694Cx pipiens (13)
06/25/2016SacramentoSacramento95825Cx pipiens (3)
06/25/2016SacramentoSacramento95821Cx tarsalis (27)
06/25/2016SacramentoSacramento95821Cx pipiens (2)
06/25/2016SacramentoSacramento95821Cx pipiens (2)
06/25/2016SacramentoSacramento95660Cx pipiens (3)
06/25/2016SacramentoSacramento95841Cx pipiens (2)
06/25/2016SacramentoSacramento95841Cx pipiens (2)
06/25/2016SacramentoCarmichaelCx pipiens (1)
06/28/2016SacramentoNorth Highlands95660Cx tarsalis (19)
06/28/2016SacramentoSacramento95842Cx pipiens (46)
06/28/2016SacramentoNorth Highlands95660Cx tarsalis (50)
06/28/2016SacramentoSacramento, CA95842Cx tarsalis (35)
06/28/2016SacramentoSacramento, CA95842Cx tarsalis (4)
06/28/2016SacramentoSacramento95841Cx tarsalis (15)
06/28/2016SacramentoFair Oaks95628Cx pipiens (21)
06/28/2016SacramentoFair Oaks95628Cx pipiens (23)
06/28/2016SacramentoFair Oaks95628Cx tarsalis (29)
06/28/2016SacramentoFair Oaks95628Cx tarsalis (27)
06/28/2016SacramentoFair Oaks95628Cx pipiens (38)
06/28/2016SacramentoFair Oaks95628Cx pipiens (20)
06/28/2016SacramentoOrangevale95628Cx tarsalis (10)
06/28/2016SacramentoOrangevale95662Cx pipiens (4)
06/28/2016SacramentoFair Oaks95628Cx pipiens (43)
06/28/2016SacramentoRancho Cordova95670Cx pipiens (2)
06/28/2016SacramentoSacramento95826Cx pipiens (6)
06/28/2016SacramentoSacramento95827Cx pipiens (12)
06/28/2016SacramentoSacramento95827Cx pipiens (50)
06/28/2016SacramentoSacramento95827Cx pipiens (3)
06/28/2016SacramentoSacramento, CA95826Cx pipiens (1)
06/28/2016SacramentoSacramento95819Cx pipiens (10)
06/28/2016SacramentoSacramento95828Cx tarsalis (44)
06/28/2016SacramentoSacramento95828Cx tarsalis (1)
06/28/2016SacramentoSacramento95828Cx pipiens (32)
06/28/2016SacramentoSacramento95829Cx pipiens (17)
06/28/2016SacramentoElk Grove95624Cx tarsalis (48)
06/28/2016SacramentoElk Grove95624Cx tarsalis (1)
06/28/2016SacramentoElk Grove95624Cx pipiens (30)
06/28/2016SacramentoElk Grove95624Cx pipiens (25)
06/28/2016SacramentoElk Grove95624Cx tarsalis (42)
06/28/2016SacramentoElk Grove95624Cx pipiens (32)
06/28/2016SacramentoElk Grove95624Cx pipiens (11)
06/28/2016SacramentoElk Grove95624Cx tarsalis (28)
06/28/2016SacramentoElk Grove95624Cx pipiens (8)
06/28/2016SacramentoElk Grove95624Cx tarsalis (1)
06/28/2016SacramentoElk Grove95624Cx pipiens (43)
06/28/2016SacramentoElk Grove95624Cx pipiens (29)
06/28/2016SacramentoElk Grove95758Cx pipiens (29)
06/28/2016SacramentoSacramento95823Cx tarsalis (50)
06/28/2016SacramentoSacramento95823Cx pipiens (7)
06/28/2016SacramentoElk Grove95823Cx tarsalis (50)
06/28/2016SacramentoElk Grove95823Cx pipiens (27)
06/28/2016SacramentoElk Grove95758Cx tarsalis (44)
06/28/2016SacramentoElk Grove95758Cx pipiens (29)
06/28/2016SacramentoElk Grove95758Cx tarsalis (25)
06/28/2016SacramentoElk Grove95758Cx tarsalis (30)
06/28/2016SacramentoElk Grove95757Cx pipiens (50)
06/28/2016Yolowoodland95776Cx tarsalis (50)
06/28/2016YoloWoodland95776Cx tarsalis (50)

Dead birds tested positive for West Nile virus:
CollectedCountyCityZip CodeSpecies
05/10/2016SacramentoSacramento95864American Crow #16-386
05/19/2016SacramentoSacramento95826Yellow-billed Magpie #16-517
05/23/2016SacramentoSacramento95864American Crow #16-551
05/27/2016SacramentoFair Oaks95628Western Scrub-jay #16-635
05/27/2016SacramentoFair Oaks95628Western Scrub-jay #16-636
05/31/2016SacramentoSacramento95864American Crow #16-679
06/01/2016SacramentoSacramento95864American Crow #16-681
05/31/2016SacramentoSacramento95864American Crow #16-683
06/01/2016SacramentoSacramento95864American Crow #16-690
05/31/2016SacramentoFair Oaks95628Yellow-billed Magpie #16-689
06/02/2016SacramentoOrangevale95662Yellow-billed Magpie #16-696
06/02/2016SacramentoSacramento95825Yellow-billed Magpie #16-710
06/03/2016SacramentoFair Oaks95628Yellow-billed Magpie #16-736
06/03/2016SacramentoSacramento95864American Crow #16-742
06/02/2016SacramentoSacramento95821American Crow #16-744
06/03/2016SacramentoSacramento95826Western Scrub-jay #16-747
06/03/2016SacramentoSacramento95822American Crow #16-757
06/04/2016SacramentoSacramento95821American Crow #16-765
06/05/2016SacramentoSacramento95864American Crow #16-766
06/05/2016SacramentoSacramento95864American Crow #16-770
06/05/2016SacramentoSacramento95821Western Scrub-jay #16-773
06/04/2016SacramentoSacramento95864American Crow #16-776
06/07/2016SacramentoSacramento95864American Crow #16-800
06/06/2016SacramentoElk Grove95758American Crow #16-797
06/06/2016SacramentoSacramento95825American Crow #16-799
06/06/2016SacramentoSacramento95864American Crow #16-810
06/07/2016SacramentoSacramento95827American Crow #16-815
06/07/2016SacramentoSacramento95827American Crow #16-831
06/08/2016SacramentoSacramento95864American Crow #16-854
06/08/2016SacramentoSacramento95864American Crow #16-855
06/08/2016SacramentoSacramento95831American Crow #16-857
06/08/2016SacramentoSacramento95864American Crow #16-864
06/09/2016SacramentoSacramento95864American Crow #16-881
06/09/2016SacramentoSacramento95864American Crow #16-884
06/09/2016SacramentoCarmichael95608Western Scrub-jay #16-885
06/10/2016SacramentoSacramento95864American Crow #16-886
06/10/2016SacramentoSacramento95821American Crow #16-890
06/10/2016SacramentoFair Oaks95628Yellow-billed Magpie #16-904
06/13/2016SacramentoSacramento95822American Crow #16-907
06/13/2016SacramentoCarmichael95608Yellow-billed Magpie #16-912
06/13/2016SacramentoSacramento95826American Crow #16-913
06/13/2016SacramentoSacramento95841Western Scrub-jay #16-914
06/12/2016SacramentoSacramento95821American Crow #16-920
06/10/2016SacramentoCarmichael95608American Crow #16-921
06/12/2016SacramentoSacramento95864Yellow-billed Magpie #16-925
06/12/2016SacramentoElk Grove95624Western Scrub-jay #16-926
06/11/2016SacramentoSacramento95834House Finch #16-928
06/13/2016SacramentoSacramento95684American Crow #16-945
06/13/2016SacramentoSacramento95864American Crow #16-950
06/14/2016SacramentoSacramento95822American Crow #16-952
06/14/2016SacramentoCarmichael95608American Crow #16-955
06/14/2016YoloDavis95618Western Scrub-jay #16-960
06/14/2016SacramentoSacramento95821House Sparrow #16-961
06/14/2016SacramentoFair Oaks95628Yellow-billed Magpie #16-972
06/15/2016SacramentoSacramento95826American Crow #16-988
06/15/2016SacramentoSacramento95825American Crow #16-996
06/15/2016SacramentoFair Oaks95628Yellow-billed Magpie #16-997
06/15/2016SacramentoElk Grove95624Western Scrub-jay #16-998
06/16/2016SacramentoCarmichael95608Western Scrub-jay #16-1006
06/16/2016SacramentoCarmichael95608Yellow-billed Magpie #16-1007
06/15/2016SacramentoCarmichael95608Western Scrub-jay #16-1009
06/16/2016SacramentoSacramento95864American Crow #16-1019
06/16/2016SacramentoSacramento95826American Crow #16-1021
06/16/2016SacramentoSacramento95821American Crow #16-1028
06/16/2016SacramentoSacramento95821Western Scrub-jay #16-1033
06/17/2016SacramentoCarmichael95608Western Scrub-jay #16-1044
06/16/2016SacramentoIsleton95641Northern Mockingbird #16-1008
06/16/2016SacramentoSacramento95827American Crow #16-1043
06/17/2016SacramentoOrangevale95662American Crow #16-1045
06/16/2016SacramentoSacramento95864American Crow #16-1056
06/17/2016SacramentoCarmichael95608Western Scrub-jay #16-1061
06/17/2016SacramentoFair Oaks95628Oak Titmouse #16-1068
06/17/2016SacramentoSacramento95864American Crow #16-1084
06/17/2016SacramentoFair Oaks95628American Crow #16-1088
06/17/2016SacramentoCarmichael95608Yellow-billed Magpie #16-1091
06/17/2016SacramentoFair Oaks95628Western Scrub-jay #16-1095
06/19/2016SacramentoSacramento95864American Crow #16-1104
06/19/2016SacramentoSacramento95864Western Scrub-jay #16-1105
06/19/2016SacramentoOrangevale95662Yellow-billed Magpie #16-1106
06/18/2016SacramentoSacramento95821Bushtit #16-1108
06/19/2016SacramentoSacramento95821Yellow-billed Magpie #16-1110
06/18/2016SacramentoOrangevale95662Western Scrub-jay #16-1112
06/18/2016SacramentoCitrus Heights95621Western Scrub-jay #16-1114
06/18/2016SacramentoOrangevale95662Western Scrub-jay #16-1116
06/19/2016SacramentoElk Grove95624Western Scrub-jay #16-1117
06/19/2016SacramentoElk Grove95624Western Scrub-jay #16-1118
06/19/2016SacramentoElk Grove95624Western Scrub-jay #16-1119
06/20/2016SacramentoCarmichael95608Western Scrub-jay #16-1121
06/19/2016SacramentoSacramento95823Western Scrub-jay #16-1122
06/19/2016SacramentoSacramento95864Yellow-billed Magpie #16-1123
06/20/2016SacramentoSacramento95864Western Scrub-jay #16-1126
06/20/2016SacramentoSacramento95864American Crow #16-1128
06/20/2016SacramentoSacramento95864Western Scrub-jay #16-1130
06/20/2016SacramentoCarmichael95608Western Scrub-jay #16-1142
06/20/2016SacramentoSacramento95838American Crow #16-1144
06/20/2016SacramentoFair Oaks95628Western Scrub-jay #16-1146
06/18/2016SacramentoSacramento95826American Crow #16-1151
06/20/2016SacramentoFoothills Farms95842House Finch #16-1155
06/20/2016SacramentoSacramento95821Cooper's Hawk #16-1158
06/21/2016SacramentoSacramento95864American Crow #16-1159
06/17/2016SacramentoCarmichael95608Yellow-billed Magpie #16-1160
06/21/2016SacramentoSacramento95821Lesser Goldfinch #16-1161
06/21/2016SacramentoSacramento95864American Crow #16-1167
06/21/2016SacramentoSacramento95864American Crow #16-1168
06/21/2016SacramentoOrangevale95662Western Scrub-jay #16-1170
06/21/2016SacramentoSacramento95838American Crow #16-1171
06/21/2016SacramentoOrangevale95662Brewer's Blackbird #16-1175
06/21/2016SacramentoSacramento95823American Crow #16-1177
06/21/2016YoloDavis95618Western Scrub-jay #16-1182
06/22/2016SacramentoFair Oaks95628Brewer's Blackbird #16-1191
06/22/2016SacramentoSacramento95825Western Scrub-jay #16-1194
06/22/2016SacramentoSacramento95826American Crow #16-1195
06/22/2016SacramentoSacramento95821Western Scrub-jay #16-1205
06/22/2016SacramentoSacramento95825Western Scrub-jay #16-1211
06/22/2016SacramentoSacramento95825Western Scrub-jay #16-1212
06/22/2016SacramentoSacramento95864American Crow #16-1221
06/23/2016SacramentoSacramento95864American Crow #16-1222
06/22/2016SacramentoSacramento95864American Crow #16-1223
06/22/2016SacramentoSacramento95821Western Scrub-jay #16-1225
06/23/2016SacramentoOrangevale95662Western Scrub-jay #16-1231
06/22/2016SacramentoCarmichael95608American Crow #16-1233
06/22/2016SacramentoCarmichael95608House Finch #16-1237
06/23/2016SacramentoSacramento95864American Crow #16-1243
06/23/2016SacramentoSacramento95828Western Scrub-jay #16-1244
06/23/2016SacramentoSacramento95828Western Scrub-jay #16-1245
06/23/2016SacramentoSacramento95864American Crow #16-1249
06/23/2016SacramentoSacramento95838American Crow #16-1251
06/23/2016SacramentoSacramento95838American Crow #16-1252
06/23/2016SacramentoSacramento95838American Crow #16-1253
06/23/2016SacramentoCarmichael95608Yellow-billed Magpie #16-1268
06/23/2016SacramentoElk Grove95757White-tailed Kite #16-1269
06/23/2016SacramentoCarmichael95608American Crow #16-1271
06/23/2016SacramentoCarmichael95608Western Scrub-jay #16-1274
06/24/2016SacramentoCarmichael95608Lesser Goldfinch #16-1288
06/23/2016SacramentoCarmichael95608Western Scrub-jay #16-1289
06/24/2016SacramentoElk Grove95758Western Scrub-jay #16-1291
06/24/2016SacramentoElk Grove95758Western Scrub-jay #16-1292
06/24/2016SacramentoElk Grove95758Western Scrub-jay #16-1293
06/24/2016SacramentoCarmichael95608Western Scrub-jay #16-1297


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.