Updated 01/12/07

West Nile Virus Activity in California Counties

2007 YTD

Counties with West Nile virus activity (number of human infections)

Counties with West Nile virus activity (no human cases)

N = 0 counties with human infection

Human infections 0Horses 0Dead birds 1Mosquito pools 0Sentinel chickens 0

Updated 01/26/07

West Nile Virus Activity in California Counties

2007 YTD

Counties with West Nile virus activity (number of human infections)

Counties with West Nile virus activity (no human cases)

N = 0 counties with human infection

Human infections 0Horses 0Dead birds 1Mosquito pools 2Sentinel chickens 1

Updated 02/16/07

West Nile Virus Activity in California Counties

2007 YTD

Counties with West Nile virus activity (number of human infections)

Counties with West Nile virus activity (no human cases)

N = 0 counties with human infection

Human infections 0Horses 1Dead birds 1Mosquito pools 2Sentinel chickens 2Squirrels 0

Updated 03/09/07

West Nile Virus Activity in California Counties

2007 YTD

Counties with West Nile virus activity (number of human infections)

Counties with West Nile virus activity (no human cases)

N = 0 counties with human infection

Human infections 0Horses 1Dead birds 5Mosquito pools 2Sentinel chickens 2Squirrels 0

Updated 03/23/07

West Nile Virus Activity in California Counties

2007 YTD

Counties with West Nile virus activity (number of human infections)

Counties with West Nile virus activity (no human cases)

N = 0 counties with human infection

Human infections 0Horses 1Dead birds 8Mosquito pools 2Sentinel chickens 2Squirrels 0

Updated 03/30/07

West Nile Virus Activity in California Counties

2007 YTD

Counties with West Nile virus activity (number of human infections)

Counties with West Nile virus activity (no human cases)

N = 0 counties with human infection

Human infections 0Horses 1Dead birds 10Mosquito pools 2Sentinel chickens 2Squirrels 0

Updated 04/06/07

West Nile Virus Activity in California Counties

2007 YTD

Counties with West Nile virus activity (number of human infections)

Counties with West Nile virus activity (no human cases)

N = 0 counties with human infection

Human infections 0Horses 1Dead birds 12Mosquito pools 2Sentinel chickens 2Squirrels 0

Updated 04/13/07

West Nile Virus Activity in California Counties

2007 YTD

Counties with West Nile virus activity (number of human infections)

Counties with West Nile virus activity (no human cases)

N = 0 counties with human infection

Human infections 0Horses 1Dead birds 15Mosquito pools 2Sentinel chickens 2Squirrels 0

Updated 04/20/07

West Nile Virus Activity in California Counties

2007 YTD

Counties with West Nile virus activity (number of human infections)

Counties with West Nile virus activity (no human cases)

N = 0 counties with human infection

Human infections 0Horses 1Dead birds 17Mosquito pools 2Sentinel chickens 2Squirrels 0

Updated 05/03/07

West Nile Virus Activity in California Counties

2007 YTD

Counties with West Nile virus activity (number of human infections)

Counties with West Nile virus activity (no human cases)

N = 0 counties with human infection

Human infections 0Horses 1Dead birds 18Mosquito pools 2Sentinel chickens 2Squirrels 0

Updated 05/11/07

West Nile Virus Activity in California Counties

2007 YTD

Counties with West Nile virus activity (number of human infections)

Counties with West Nile virus activity (no human cases)

N = 0 counties with human infection

Human infections 0Horses 1Dead birds 22Mosquito pools 2Sentinel chickens 2Squirrels 0

Updated 05/18/07

West Nile Virus Activity in California Counties

2007 YTD

Counties with West Nile virus activity (number of human infections)

Counties with West Nile virus activity (no human cases)

N = 0 counties with human infection

Human infections 0Horses 1Dead birds 22Mosquito pools 2Sentinel chickens 2Squirrels 0

Updated 05/29/07

West Nile Virus Activity in California Counties

2007 YTD

Counties with West Nile virus activity (number of human infections)

Counties with West Nile virus activity (no human cases)

N = 0 counties with human infection

Human infections 0Horses 1Dead birds 22Mosquito pools 3Sentinel chickens 2Squirrels 0

Updated 05/31/07

West Nile Virus Activity in California Counties

2007 YTD

Counties with West Nile virus activity (number of human infections)

Counties with West Nile virus activity (no human cases)

N = 0 counties with human infection

Human infections 0Horses 1Dead birds 23Mosquito pools 3Sentinel chickens 2Squirrels 0

Updated 06/1/07

West Nile Virus Activity in California Counties

2007 YTD

Counties with West Nile virus activity (number of human infections)

Counties with West Nile virus activity (no human cases)

N = 0 counties with human infection

Human infections 0Horses 1Dead birds 23Mosquito pools 3Sentinel chickens 2Squirrels 0

Updated 06/6/07

West Nile Virus Activity in California Counties

2007 YTD

Counties with West Nile virus activity (number of human infections)

Counties with West Nile virus activity (no human cases)

N = 0 counties with human infection

Human infections 0Horses 1Dead birds 25Mosquito pools 3Sentinel chickens 2Squirrels 0

Updated 06/8/07

West Nile Virus Activity in California Counties

2007 YTD

Counties with West Nile virus activity (number of human infections)

Counties with West Nile virus activity (no human cases)

N = 0 counties with human infection

Human infections 0Horses 1Dead birds 25Mosquito pools 4Sentinel chickens 2Squirrels 0

Updated 06/13/07

West Nile Virus Activity in California Counties

2007 YTD

Counties with West Nile virus activity (number of human infections)

Counties with West Nile virus activity (no human cases)

N = 0 counties with human infection

Human cases 0Horses 1Dead birds 33Mosquito pools 4Sentinel chickens 2Squirrels 0

Updated 06/15/07

West Nile Virus Activity in California Counties

2007 YTD

Counties with West Nile virus activity (number of human infections)

Counties with West Nile virus activity (no human cases)

N = 0 counties with human infection

Human cases 0Horses 1Dead birds 33

Mosquito pools 18Sentinel chickens 2Squirrels 0

Updated 06/21/07

West Nile Virus Activity in California Counties

2007 YTD

Counties with West Nile virus activity (number of human infections)

Counties with West Nile virus activity (no human cases)

N = 1 county with human case

Human cases 1Horses 2Dead birds 58

Mosquito pools 18Sentinel chickens 2Squirrels 0

Updated 06/22/07

West Nile Virus Activity in California Counties

2007 YTD

Counties with West Nile virus activity (number of human infections)

Counties with West Nile virus activity (no human cases)

N = 1 county with human case

Human cases 1Horses 2Dead birds 58

Mosquito pools 33Sentinel chickens 2Squirrels 0

Updated 06/28/07

West Nile Virus Activity in California Counties

2007 YTD

Counties with West Nile virus activity (number of human infections)

Counties with West Nile virus activity (no human cases)

N = 1 county with human case

Human cases 1Horses 2Dead birds 100

Mosquito pools 33Sentinel chickens 2Squirrels 0

1

Updated 06/28/07

West Nile Virus Activity in California Counties

2007 YTD

Counties with West Nile virus activity (number of human infections)

Counties with West Nile virus activity (no human cases)

N = 1 county with human case

Human cases 1Horses 2Dead birds 99 Mosquito pools 33Sentinel chickens 2Squirrels 0

1

Updated 06/29/07

West Nile Virus Activity in California Counties

2007 YTD

Counties with West Nile virus activity (number of human infections)

Counties with West Nile virus activity (no human cases)

N = 1 county with human case

Human cases 1Horses 2Dead birds 99 Mosquito pools 72Sentinel chickens 4Squirrels 0

1

Updated 07/05/07

West Nile Virus Activity in California Counties

2007 YTD

Counties with West Nile virus activity (number of human infections)

Counties with West Nile virus activity (no human cases)

N = 1 county with human case

Human cases 3Horses 2Dead birds 159 Mosquito pools 72Sentinel chickens 4Squirrels 1

3

Updated 07/06/07

West Nile Virus Activity in California Counties

2007 YTD

Counties with West Nile virus activity (number of human infections)

Counties with West Nile virus activity (no human cases)

N = 1 county with human case

Human cases 3Horses 2Dead birds 159 Mosquito pools 141Sentinel chickens 6Squirrels 1

3

Updated 07/12/07

West Nile Virus Activity in California Counties

2007 YTD

Counties with West Nile virus activity (number of human cases)

Counties with West Nile virus activity (no human cases)

N = 1 county with human case

Human cases 3Horses 2Dead birds 230 Mosquito pools 141Sentinel chickens 6Squirrels 3

3

Updated 07/13/07

West Nile Virus Activity in California Counties

2007 YTD

Counties with West Nile virus activity (number of human cases)

Counties with West Nile virus activity (no human cases)

N = 1 county with human case

Human cases 9Horses 2Dead birds 230 Mosquito pools 182Sentinel chickens 13Squirrels 3

8

1

Updated 07/18/07

West Nile Virus Activity in California Counties

2007 YTD

Counties with West Nile virus activity (number of human cases)

Counties with West Nile virus activity (no human cases)

N = 4 counties with human cases

Human cases 25Horses 2Dead birds 355 Mosquito pools 182Sentinel chickens 13Squirrels 5

22

1

1 1

Updated 07/23/07

West Nile Virus Activity in California Counties

2007 YTD

Counties with West Nile virus activity (number of human cases)

Counties with West Nile virus activity (no human cases)

N = 6 counties with human cases

Human cases 27Horses 4Dead birds 355 Mosquito pools 221Sentinel chickens 21Squirrels 5

22

1

1 1

11

Updated 07/24/07

West Nile Virus Activity in California Counties

2007 YTD

Counties with West Nile virus activity (number of human cases)

Counties with West Nile virus activity (no human cases)

N = 8 counties with human cases

Human cases 36Horses 4Dead birds 355 Mosquito pools 221Sentinel chickens 21Squirrels 5

28

1

1 1

12

1

1

Updated 07/25/07

West Nile Virus Activity in California Counties

2007 YTD

Counties with West Nile virus activity (number of human cases)

Counties with West Nile virus activity (no human cases)

N = 8 counties with human cases

Human cases 36Horses 4Dead birds 423 Mosquito pools 221Sentinel chickens 21Squirrels 5

28

1

1 1

12

1

1

Updated 07/27/07

West Nile Virus Activity in California Counties

2007 YTD

Counties with West Nile virus activity (number of human cases)

Counties with West Nile virus activity (no human cases)

N = 12 counties with human cases

Human cases 42Horses 5Dead birds 423 Mosquito pools 317Sentinel chickens 30Squirrels 5

28

1

1 1

12

2

1

1

2

1

1

Updated 07/31/07

West Nile Virus Activity in California Counties

2007 YTD

Counties with West Nile virus activity (number of human cases)

Counties with West Nile virus activity (no human cases)

N = 12 counties with human cases

Human cases 56Horses 5Dead birds 423 Mosquito pools 317Sentinel chickens 30Squirrels 5

38

2

1 1

13

3

1

1

2

1

1 1

Updated 08/1/07

West Nile Virus Activity in California Counties

2007 YTD

Counties with West Nile virus activity (number of human cases)

Counties with West Nile virus activity (no human cases)

N = 13 counties with human cases

Human cases 56Horses 5Dead birds 502 Mosquito pools 317Sentinel chickens 29Squirrels 5

38

2

1 1

13

3

1

1

2

1

1 1

Updated 08/3/07

West Nile Virus Activity in California Counties

2007 YTD

Counties with West Nile virus activity (number of human cases)

Counties with West Nile virus activity (no human cases)

N = 15 counties with human cases

Human cases 64Horses 5Dead birds 502 Mosquito pools 402Sentinel chickens 66Squirrels 7

38

2

1 2

34

5

1

1

2

1

1 1

1

1

Updated 08/7/07

West Nile Virus Activity in California Counties

2007 YTD

Counties with West Nile virus activity (number of human cases)

Counties with West Nile virus activity (no human cases)

N = 15 counties with human cases

Human cases 80Horses 5Dead birds 502 Mosquito pools 402Sentinel chickens 66Squirrels 7

48

2

1 4

34

6

1

1

4

1

1 1

1

2

Updated 08/8/07

West Nile Virus Activity in California Counties

2007 YTD

Counties with West Nile virus activity (number of human cases)

Counties with West Nile virus activity (no human cases)

N = 15 counties with human cases

Human cases 80Horses 5Dead birds 552 Mosquito pools 402Sentinel chickens 66Squirrels 7

48

2

1 4

34

6

1

1

4

1

1 1

1

2

Updated 08/10/07

West Nile Virus Activity in California Counties

2007 YTD

Counties with West Nile virus activity (number of human cases)

Counties with West Nile virus activity (no human cases)

N = 18 counties with human cases

Human cases 86Horses 9Dead birds 552 Mosquito pools 524Sentinel chickens 106Squirrels 7

48

2

1 4

34

7

1

1

6

1

1 1

1

2

1

11

Updated 08/14/07

West Nile Virus Activity in California Counties

2007 YTD

Counties with West Nile virus activity (number of human cases)

Counties with West Nile virus activity (no human cases)

N = 19 counties with human cases

Human cases 108Horses 9Dead birds 552 Mosquito pools 524Sentinel chickens 106Squirrels 7

63

3

1 4

35

7

1

1

6

1

1 2

2

2

1

11

3

Updated 08/15/07

West Nile Virus Activity in California Counties

2007 YTD

Counties with West Nile virus activity (number of human cases)

Counties with West Nile virus activity (no human cases)

N = 19 counties with human cases

Human cases 108Horses 9Dead birds 641 Mosquito pools 524Sentinel chickens 106Squirrels 8

63

3

1 4

35

7

1

1

6

1

1 2

2

2

1

11

3

Updated 08/21/07

West Nile Virus Activity in California Counties

2007 YTD

Counties with West Nile virus activity (number of human cases)

Counties with West Nile virus activity (no human cases)

N = 21 counties with human cases

Human cases 137Horses 12Dead birds 641 Mosquito pools 590Sentinel chickens 136Squirrels 8

78

3

1 4

38

9

1

1

7

1

1 3

2

2

4

21

3

2

1

Updated 08/23/07

West Nile Virus Activity in California Counties

2007 YTD

Counties with West Nile virus activity (number of human cases)

Counties with West Nile virus activity (no human cases)

N = 21 counties with human cases

Human cases 137Horses 12Dead birds 717 Mosquito pools 590Sentinel chickens 136Squirrels 10

78

3

1 4

38

9

1

1

7

1

1 3

2

2

4

21

3

2

1

Updated 08/24/07

West Nile Virus Activity in California Counties

2007 YTD

Counties with West Nile virus activity (number of human cases)

Counties with West Nile virus activity (no human cases)

N = 22 counties with human cases

Human cases 147Horses 16Dead birds 717 Mosquito pools 673Sentinel chickens 189Squirrels 10

78

3

1 5

310

9

2

1

8

1

1 7

2

2

4

21

3

2

1

1

Updated 08/29/07

West Nile Virus Activity in California Counties

2007 YTD

Counties with West Nile virus activity (number of human cases)

Counties with West Nile virus activity (no human cases)

N = 23 counties with human cases

Human cases 164Horses 16Dead birds 789 Mosquito pools 673Sentinel chickens 189Squirrels 10

91

3

1 6

310

10

2

1

8

1

1 8

2

2

4

21

3

2

1

1

1

Updated 08/31/07

West Nile Virus Activity in California Counties

2007 YTD

Counties with West Nile virus activity (number of human cases)

Counties with West Nile virus activity (no human cases)

N = 23 counties with human cases

Human cases 172Horses 18Dead birds 789 Mosquito pools 761Sentinel chickens 194Squirrels 10

91

3

1 7

310

10

2

1

10

2

1 10

2

2

6

21

3

2

1

1

1

Updated 09/4/07

West Nile Virus Activity in California Counties

2007 YTD

Counties with West Nile virus activity (number of human cases)

Counties with West Nile virus activity (no human cases)

N = 23 counties with human cases

Human cases 185Horses 19Dead birds 789 Mosquito pools 761Sentinel chickens 194Squirrels 10

100

4

1 7

310

10

2

1

10

3

1 10

2

2

6

21

4

3

1

1

1

Updated 09/5/07

West Nile Virus Activity in California Counties

2007 YTD

Counties with West Nile virus activity (number of human cases)

Counties with West Nile virus activity (no human cases)

N = 23 counties with human cases

Human cases 185Horses 19Dead birds 832 Mosquito pools 761Sentinel chickens 189Squirrels 11

100

4

1 7

310

10

2

1

10

3

1 10

2

2

6

21

4

3

1

1

1

Updated 09/7/07

West Nile Virus Activity in California Counties

2007 YTD

Counties with West Nile virus activity (number of human cases)

Counties with West Nile virus activity (no human cases)

N = 24 counties with human cases

Human cases 198Horses 19Dead birds 832 Mosquito pools 819Sentinel chickens 231Squirrels 11

100

4

1 7

311

10

3

1

11

4

1 13

3

2

8

21

4

3

2

1

1

2

Updated 09/11/07

West Nile Virus Activity in California Counties

2007 YTD

Counties with West Nile virus activity (number of human cases)

Counties with West Nile virus activity (no human cases)

N = 25 counties with human cases

Human cases 212Horses 19Dead birds 832 Mosquito pools 819Sentinel chickens 231Squirrels 11

107

4

1 7

312

10

3

1

13

6

1 13

4

2

8

21

4

3

2

1

1

2

1

Updated 09/14/07

West Nile Virus Activity in California Counties

2007 YTD

Counties with West Nile virus activity (number of human cases)

Counties with West Nile virus activity (no human cases)

N = 26 counties with human cases

Human cases 231Horses 21Dead birds 915 Mosquito pools 891Sentinel chickens 273Squirrels 13

107

4

1 7

412

11

3

1

16

6

1 13

5

2

13

21

4

3

2

1

7

2

1

2

Updated 09/20/07

West Nile Virus Activity in California Counties

2007 YTD

Counties with West Nile virus activity (number of human cases)

Counties with West Nile virus activity (no human cases)

N = 27 counties with human cases

Human cases 245Horses 22Dead birds 1070 Mosquito pools 891Sentinel chickens 273Squirrels 15

115

4

2 7

412

11

3

1

16

7

1 13

5

2

13

21

4

3

2

1

8

4

1

2

1

Updated 09/21/07

West Nile Virus Activity in California Counties

2007 YTD

Counties with West Nile virus activity (number of human cases)

Counties with West Nile virus activity (no human cases)

N = 28 counties with human cases

Human cases 257Horses 22Dead birds 1070 Mosquito pools 918Sentinel chickens 330Squirrels 15

115

4

2 7

413

12

3

1

16

7

1 14

5

2

14

21

4

3

2

1

9

4

1

2

1

7

Updated 09/26/07

West Nile Virus Activity in California Counties

2007 YTD

Counties with West Nile virus activity (number of human cases)

Counties with West Nile virus activity (no human cases)

N = 28 counties with human cases

Human cases 271Horses 24Dead birds 1170 Mosquito pools 917Sentinel chickens 330Squirrels 17

117

6

2 7

414

13

3

2

16

7

1 14

5

2

13

21

4

5

3

1

10

8

1

2

1

7

Updated 09/28/07

West Nile Virus Activity in California Counties

2007 YTD

Counties with West Nile virus activity (number of human cases)

Counties with West Nile virus activity (no human cases)

N = 29 counties with human cases

Human cases 290Horses 24Dead birds 1170 Mosquito pools 940Sentinel chickens 330Squirrels 17

117

6

2 7

416

14

3

2

16

8

1 14

5

2

13

21

4

7

3

1

10

8

1

2

2

7

1