APPENDIX III-E:West Nile Virus Cases, U.S., 1999-2006

 

This appendix copied from the following websites:

http://www.cdc.gov/ncidod/dvbid/westnile/surv&controlCaseCount99_detailed.htm

http://www.cdc.gov/ncidod/dvbid/westnile/surv&controlCaseCount00_detailed.htm

http://www.cdc.gov/ncidod/dvbid/westnile/surv&controlCaseCount01_detailed.htm

http://www.cdc.gov/ncidod/dvbid/westnile/surv&controlCaseCount02_detailed.htm

http://www.cdc.gov/ncidod/dvbid/westnile/surv&controlCaseCount03_detailed.htm

http://www.cdc.gov/ncidod/dvbid/westnile/surv&controlCaseCount04_detailed.htm

http://www.cdc.gov/ncidod/dvbid/westnile/surv&controlCaseCount05_detailed.htm

http://www.cdc.gov/ncidod/dvbid/westnile/surv&controlCaseCount06_detailed.htm

 

1999 West Nile Virus Activity
in the
United States

State

Encephalitis/Meningitis

Fever

Clinical/Unspecified

Total

Fatalities

New York

59

3

0

62

7

Total

59

3

0

62

7

 

 

 

 

 

 

West Nile encephalitis and West Nile meningitis are forms of severe disease that affect a personís nervous system. Encephalitis refers to an inflammation of the brain, meningitis is an inflammation of the membrane around the brain and the spinal cord.
Click here for further explanation of WN meningitis and/or encephalitis.


West Nile fever refers to typically less severe cases that show no evidence of neuroinvasion. WN fever is considered a notifiable disease, however the number of cases reported (as with all diseases) may be limited by whether persons affected seek care, whether laboratory diagnosis is ordered and the extent to which cases are reported to health authorities by the diagnosing physician.

Other Clinical includes persons with clinical manifestations other than WN fever, WN encephalitis or WN meningitis, such as acute flaccid paralysis. Clinical/Unspecified cases are those for which sufficient clinical information was not provided.

Total Human Cases Reported to CDC- These numbers reflect both mild and severe human disease cases occurring between January 1, 1999 through December 31, 1999 that have been reported to ArboNET by state and local health departments. ArboNET is the national, electronic surveillance system established by CDC to assist states in tracking West Nile virus and other mosquito-borne viruses. Information regarding 1999 virus/disease activity is posted when such cases are reported to CDC.

Of the 62 cases, 59 (95%) were reported as West Nile meningitis or encephalitis (neuroinvasive disease), 3 (5%) were reported as West Nile fever (milder disease), and 0 (0%) were clinically Clinical/Unspecified at this time. Please refer to state health department web sites for further details regarding state case totals.

Note: The high proportion of neuroinvasive disease cases among reported cases of West Nile virus disease reflects surveillance reporting bias. Serious cases are more likely to be reported than mild cases. Also, the surveillance system is not designed to detect asymptomatic infections. Data from population-based surveys indicate that among all people who become infected with West Nile virus (including people with asymptomatic infections) less than 1% will develop severe neuroinvasive disease. See: Mostashari F, Bunning ML, Kitsutani PT, et al. Epidemic West Nile Encephalitis, New York, 1999: Results of a household-based seroepidemiological survey. Lancet 2001;358:261-264.

For Case Information:
1999|2000|2001|2002|2003|2004|2005|2006|2007

2000 West Nile Virus Activity
in the
United States

State

Encephalitis/Meningitis

Fever

Clinical/Unspecified

Total

Fatalities

Connecticut

0

1

0

1

0

New Jersey

5

1

0

6

1

New York

14

0

0

14

1

Total

19

2

0

21

2

 

 

 

 

 

 


Total Human Cases Reported to CDC- These numbers reflect both mild and severe human disease cases occurring between January 1, 2001 through December 31, 2001 that have been reported to ArboNET by state and local health departments. ArboNET is the national, electronic surveillance system established by CDC to assist states in tracking West Nile virus and other mosquito-borne viruses. Information regarding 2001 virus/disease activity is posted when such cases are reported to CDC.

Of the 21 cases, 19 (90%) were reported as West Nile meningitis or encephalitis (neuroinvasive disease), 2 (10%) were reported as West Nile fever (milder disease), and 0 (0%) were clinically Clinical/Unspecified at this time. Please refer to state health department web sites for further details regarding state case totals.

2001 West Nile Virus Activity
in the
United States

State

Encephalitis/Meningitis

Fever

Clinical/Unspecified

Total

Fatalities

Alabama

2

0

0

2

1

Connecticut

6

0

0

6

1

Florida

12

0

0

12

0

Georgia

6

0

0

6

1

Louisiana

1

0

0

1

0

Maryland

6

0

0

6

2

Massachusetts

3

0

0

3

1

New Jersey

12

0

0

12

1

New York

13

2

0

15

2

Pennsylvania

3

0

0

3

0

Total

64

2

0

66

9

 

 

 

 

 

 


West Nile encephalitis and West Nile meningitis are forms of severe disease

Total Human Cases Reported to CDC- These numbers reflect both mild and severe human disease cases occurring between January 1, 2001 through December 31, 2001 that have been reported to ArboNET by state and local health departments. ArboNET is the national, electronic surveillance system established by CDC to assist states in tracking West Nile virus and other mosquito-borne viruses. Information regarding 2001 virus/disease activity is posted when such cases are reported to CDC.

Of the 66 cases, 64 (97%) were reported as West Nile meningitis or encephalitis (neuroinvasive disease), 2 (3%) were reported as West Nile fever (milder disease), and 0 (1%) were clinically Clinical/Unspecified at this time. Please refer to state health department web sites for further details regarding state case totals.

2002 West Nile Virus Activity
in the
United States

State

Encephalitis/Meningitis

Fever

Clinical/Unspecified

Total

Fatalities

Alabama

34

15

0

49

3

Arkansas

32

11

0

43

3

California

1

0

0

1

0

Colorado

6

8

0

14

0

Connecticut

10

6

1

17

0

Delaware

0

1

0

1

0

District of Columbia

14

19

1

34

1

Florida

28

0

0

28

2

Georgia

28

15

1

44

7

Illinois

553

328

3

884

64

Indiana

180

102

11

293

11

Iowa

27

27

0

54

2

Kansas

22

0

0

22

0

Kentucky

53

22

0

75

5

Louisiana

204

122

3

329

25

Maryland

22

14

0

36

7

Massachusetts

19

4

0

23

3

Michigan

557

54

3

614

51

Minnesota

16

32

0

48

0

Mississippi

162

29

1

192

12

Missouri

126

42

0

168

7

Montana

2

0

0

2

0

Nebraska

84

53

15

152

7

New Jersey

16

8

0

24

0

New York

68

12

2

82

5

North Carolina

2

0

0

2

0

North Dakota

3

11

3

17

2

Ohio

310

131

0

441

31

Oklahoma

16

4

1

21

2

Pennsylvania

42

20

0

62

7

Rhode Island

1

0

0

1

0

South Carolina

1

0

0

1

0

South Dakota

17

20

0

37

0

Tennessee

47

9

0

56

7

Texas

202

0

0

202

13

Vermont

0

1

0

1

0

Virginia

16

12

1

29

2

West Virginia

3

0

0

3

2

Wisconsin

22

26

4

52

3

Wyoming

0

2

0

2

0

Total

2946

1160

50

4156

284

 

 

 

 

 

 


Total Human Cases Reported to CDC- These numbers reflect both mild and severe human disease cases occurring between January 1, 2002 through December 31, 2002 that have been reported to ArboNET by state and local health departments. ArboNET is the national, electronic surveillance system established by CDC to assist states in tracking West Nile virus and other mosquito-borne viruses. Information regarding 2002 virus/disease activity is posted when such cases are reported to CDC.

Of the 4156 cases, 2946 (71%) were reported as West Nile meningitis or encephalitis (neuroinvasive disease), 1160 (28%) were reported as West Nile fever (milder disease), and 50 (1%) were clinically Clinical/Unspecified at this time. Please refer to state health department web sites for further details regarding state case totals.

 

 

 

 

 

2003 West Nile Virus Activity
in the
United States

State

Encephalitis/Meningitis

Fever

Clinical/Unspecified

Total

Fatalities

Alabama

25

10

2

37

3

Arizona

7

2

4

13

1

Arkansas

23

2

0

25

0

California

2

1

0

3

0

Colorado

621

2326

0

2947

63

Connecticut

12

5

0

17

0

Delaware

12

4

1

17

2

District of Columbia

3

0

0

3

0

Florida

61

33

0

94

6

Georgia

27

21

2

50

4

Idaho

0

1

0

1

0

Illinois

30

24

0

54

1

Indiana

15

31

1

47

4

Iowa

81

65

1

147

6

Kansas

89

0

2

91

4

Kentucky

11

1

2

14

1

Louisiana

101

23

0

124

8

Maryland

49

23

1

73

8

Massachusetts

12

5

0

17

1

Michigan

14

4

1

19

2

Minnesota

48

100

0

148

4

Mississippi

34

38

15

87

1

Missouri

39

25

0

64

8

Montana

75

135

12

222

4

Nebraska

194

1741

7

1942

29

Nevada

2

0

0

2

0

New Hampshire

2

0

1

3

0

New Jersey

21

9

4

34

3

New Mexico

74

135

0

209

4

New York

57

12

2

71

11

North Carolina

16

8

0

24

2

North Dakota

94

523

0

617

5

Ohio

84

24

0

108

8

Oklahoma

56

23

0

79

0

Pennsylvania

145

90

2

237

8

Rhode Island

5

2

0

7

1

South Carolina

3

3

0

6

0

South Dakota

151

869

19

1039

14

Tennessee

21

5

0

26

1

Texas

431

289

0

720

37

Utah

0

1

0

1

0

Vermont

0

3

0

3

0

Virginia

19

1

6

26

1

West Virginia

1

1

0

2

0

Wisconsin

7

2

8

17

0

Wyoming

92

210

73

375

9

Total  

2866

6830

166

9862

264

Total Human Cases Reported to CDC for 2003- These numbers reflect both mild and severe human disease cases occurring between Jan.1 -Dec. 31, 2003 that have been reported to ArboNET by state and local health departments. ArboNET is the national, electronic surveillance system established by CDC to assist states in tracking West Nile virus and other mosquito-borne viruses. Information regarding 2004 virus/disease activity will be posted when such cases are reported to CDC.

Of 9862 cases, 6830 (69%) were reported as
West Nile fever (milder disease), 2866 (29%) were reported as West Nile meningitis or encephalitis (neuroinvasive disease) and 166 (2%) were clinically Clinical/Unspecified. Please refer to state health department web sites for further details regarding state case totals.

 

2004 West Nile Virus Activity
in the
United States

State

Encephalitis/Meningitis

Fever

Clinical/Unspecified

Total

Fatalities

Alabama

15

1

0

16

0

Arizona

214

160

17

391

16

Arkansas

17

10

1

28

0

California

289

395

95

779

28

Colorado

41

250

0

291

4

Connecticut

0

1

0

1

0

District of Columbia

1

1

0

2

0

Florida

33

8

0

41

2

Georgia

14

7

0

21

1

Idaho

1

2

0

3

0

Illinois

29

30

1

60

4

Indiana

8

2

3

13

1

Iowa

13

9

1

23

2

Kansas

18

25

0

43

2

Kentucky

1

6

0

7

0

Louisiana

85

24

0

109

7

Maryland

10

6

0

16

0

Michigan

13

3

0

16

0

Minnesota

13

21

0

34

2

Mississippi

31

18

2

51

4

Missouri

27

9

0

36

2

Montana

2

3

1

6

0

Nebraska

7

46

0

53

0

Nevada

25

19

0

44

0

New Jersey

1

0

0

1

0

New Mexico

31

53

4

88

4

New York

7

3

0

10

0

North Carolina

3

0

0

3

0

North Dakota

2

18

0

20

2

Ohio

11

1

0

12

2

Oklahoma

16

6

0

22

3

Oregon

0

3

0

3

0

Pennsylvania

9

5

1

15

2

South Carolina

0

2

0

2

0

South Dakota

6

45

0

51

1

Tennessee

13

1

0

14

0

Texas

119

57

0

176

8

Utah

6

5

0

11

0

Virginia

4

0

1

5

1

Wisconsin

5

7

0

12

2

Wyoming

2

7

1

10

0

Total  

1142

1269

128

2539

100


Total Human Cases Reported to CDC- These numbers reflect both mild and severe human disease cases occurring between January 1, 2004 through December 31, 2004 that have been reported to ArboNET by state and local health departments. ArboNET is the national, electronic surveillance system established by CDC to assist states in tracking West Nile virus and other mosquito-borne viruses. Information regarding 2004 virus/disease activity is posted when such cases are reported to CDC.

Of the 2539 cases, 1142 (45%) were reported as West Nile meningitis or encephalitis (neuroinvasive disease), 1269 (50%) were reported as West Nile fever (milder disease), and 128 (5%) were clinically Clinical/Unspecified at this time. Please refer to state health department web sites for further details regarding state case totals.

2005 West Nile Virus Activity
in the
United States

State

Encephalitis/Meningitis

Fever

Other Clinical/Unspecified

Total

Fatalities

Alabama

6

4

0

10

2

Arizona

50

61

2

113

5

Arkansas

13

15

0

28

4

California

299

534

47

880

19

Colorado

21

85

0

106

2

Connecticut

4

2

0

6

1

Delaware

1

0

1

2

0

District of Columbia

3

2

0

5

0

Florida

10

11

0

21

1

Georgia

9

7

4

20

2

Idaho

3

10

0

13

0

Illinois

134

91

27

252

13

Indiana

10

2

11

23

1

Iowa

14

21

2

37

2

Kansas

17

8

0

25

1

Kentucky

5

0

0

5

1

Louisiana

117

54

0

171

11

Maryland

4

1

0

5

0

Massachusetts

4

2

0

6

1

Michigan

52

8

2

62

4

Minnesota

18

27

0

45

3

Mississippi

39

31

0

70

6

Missouri

17

13

0

30

3

Montana

8

17

0

25

0

Nebraska

55

133

0

188

5

Nevada

14

15

2

31

1

New Jersey

3

3

0

6

0

New Mexico

20

13

0

33

2

New York

30

8

0

38

4

North Carolina

2

2

0

4

0

North Dakota

12

74

0

86

0

Ohio

46

15

0

61

2

Oklahoma

17

14

0

31

1

Oregon

1

6

0

7

0

Pennsylvania

14

11

0

25

2

Rhode Island

1

0

0

1

0

South Carolina

5

0

0

5

1

South Dakota

35

193

1

229

2

Tennessee

15

3

0

18

1

Texas

128

67

0

195

11

Utah

21

31

0

52

1

Virginia

0

1

0

1

0

Wisconsin

11

6

0

17

2

Wyoming

6

6

0

12

2

Total

1294

1607

99

3000

119

Total Human Cases Reported to CDC: These numbers reflect both mild and severe human disease cases occurring between January 1, 2005 to December 31, 2005 as reported through May 5, 2006 that have been reported to ArboNET by state and local health departments. ArboNET is the national, electronic surveillance system established by CDC to assist states in tracking West Nile virus and other mosquito-borne viruses. Information regarding 2005 virus/disease activity is posted when such cases are reported to CDC.

Of the 3000 cases, 1294 (43%) were reported as West Nile meningitis or encephalitis (neuroinvasive disease), 1607 (54%) were reported as West Nile fever (milder disease), and 99 (3%) were clinically Clinical/Unspecified at this time. Please refer to state health department web sites for further details regarding state case totals.

 

 

 

 

 

2006 West Nile Virus Activity
in the
United States

State

Encephalitis/
Meningitis

Fever

Other Clinical/Unspecified

Total

Fatalities

Alabama

8

0

0

8

0

Arizona

65

77

8

150

11

Arkansas

24

5

0

29

4

California

81

186

11

278

7

Colorado

66

279

0

345

7

Connecticut

7

2

0

9

1

District of Columbia

0

2

0

2

0

Florida

3

0

0

3

0

Georgia

2

5

1

8

1

Idaho

115

827

54

996

21

Illinois

122

69

24

215

10

Indiana

27

8

45

80

5

Iowa

21

13

3

37

0

Kansas

17

13

0

30

4

Kentucky

5

1

0

6

1

Louisiana

91

89

0

180

9

Maryland

9

1

1

11

1

Massachusetts

2

1

0

3

0

Michigan

43

10

2

55

7

Minnesota

31

34

0

65

3

Mississippi

89

94

0

183

14

Missouri

50

11

1

62

5

Montana

12

21

1

34

0

Nebraska

45

219

0

264

1

Nevada

34

76

14

124

1

New Jersey

2

2

1

5

0

New Mexico

3

5

0

8

1

New York

16

8

0

24

4

North Carolina

1

0

0

1

0

North Dakota

20

117

0

137

1

Ohio

36

12

0

48

4

Oklahoma

26

21

1

48

6

Oregon

7

50

12

69

2

Pennsylvania

8

1

0

9

2

South Carolina

1

0

0

1

0

South Dakota

38

75

0

113

3

Tennessee

16

6

0

22

1

Texas

233

121

0

354

32

Utah

56

102

0

158

5

Virginia

0

0

5

5

0

Washington

0

3

0

3

0

West Virginia

1

0

0

1

0

Wisconsin

11

10

0

21

1

Wyoming

15

40

10

65

2

Totals

1459

2616

194

4269

177


Total Human Cases Reported to CDC: These numbers reflect both mild and severe human disease cases occurring between January 1, 2006 to December 31, 2006 as reported through May 22, 2007 that have been reported to ArboNET by state and local health departments. ArboNET is the national, electronic surveillance system established by CDC to assist states in tracking West Nile virus and other mosquito-borne viruses. Information regarding 2006 virus/disease activity is posted when such cases are reported to CDC.

Of the 4269 cases, 1459 (34%) were reported as West Nile meningitis or encephalitis (neuroinvasive disease), 2616 (61%) were reported as West Nile fever (milder disease), and 194 (5%) were clinically unspecified at this time. Please refer to state health department web sites for further details regarding state case totals.