TABLE 6. Annual incidence* of West Nile virus neuroinvasive disease, by year and state — United States, 2009–2018.
| Region/State | 2009 | 2010 | 2011 | 2012 | 2013 | 2014 | 2015 | 2016 | 2017 | 2018 | Average | Median |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
|
United States
|
0.13
|
0.20
|
0.16
|
0.92
|
0.40
|
0.42
|
0.45
|
0.41
|
0.44
|
0.51
|
0.40
|
0.42
|
|
New England
|
—†
|
0.10
|
0.10
|
0.29
|
0.08
|
0.05
|
0.11
|
0.10
|
0.07
|
0.42
|
0.13
|
0.10
|
| Connecticut |
— |
0.20 |
0.22 |
0.33 |
0.03 |
0.08 |
0.22 |
0.03 |
0.06 |
0.50 |
0.17 |
0.14 |
| Maine |
— |
— |
— |
0.08 |
— |
— |
0.08 |
— |
— |
0.07 |
0.02 |
0.00 |
| Massachusetts |
— |
0.09 |
0.08 |
0.38 |
0.10 |
0.07 |
0.10 |
0.15 |
0.07 |
0.61 |
0.17 |
0.10 |
| New Hampshire |
— |
0.08 |
— |
0.08 |
0.08 |
— |
— |
— |
— |
— |
0.02 |
0.00 |
| Rhode Island |
— |
— |
0.09 |
0.19 |
0.09 |
— |
— |
0.19 |
0.09 |
— |
0.07 |
0.05 |
| Vermont |
— |
— |
0.16 |
0.16 |
0.16 |
— |
— |
0.32 |
0.32 |
0.16 |
0.13 |
0.16 |
|
Middle Atlantic
|
0.02
|
0.30
|
0.09
|
0.28
|
0.08
|
0.09
|
0.20
|
0.10
|
0.16
|
0.52
|
0.18
|
0.13
|
| New Jersey |
0.03 |
0.17 |
0.02 |
0.25 |
0.11 |
0.07 |
0.26 |
0.12 |
0.07 |
0.49 |
0.16 |
0.12 |
| New York |
0.03 |
0.46 |
0.14 |
0.31 |
0.09 |
0.10 |
0.21 |
0.10 |
0.23 |
0.39 |
0.21 |
0.18 |
| Pennsylvania |
— |
0.15 |
0.04 |
0.26 |
0.05 |
0.09 |
0.13 |
0.09 |
0.12 |
0.74 |
0.17 |
0.11 |
|
East North Central
|
0.02
|
0.17
|
0.16
|
1.06
|
0.36
|
0.13
|
0.24
|
0.38
|
0.41
|
0.65
|
0.36
|
0.30
|
| Illinois |
0.04 |
0.35 |
0.17 |
1.45 |
0.67 |
0.28 |
0.40 |
0.76 |
0.56 |
0.99 |
0.57 |
0.48 |
| Indiana |
0.03 |
0.09 |
0.11 |
0.70 |
0.29 |
0.14 |
0.24 |
0.23 |
0.27 |
0.39 |
0.25 |
0.24 |
| Michigan |
0.01 |
0.25 |
0.32 |
1.42 |
0.24 |
0.01 |
0.16 |
0.42 |
0.32 |
0.80 |
0.40 |
0.29 |
| Ohio |
— |
0.03 |
0.09 |
0.66 |
0.18 |
0.09 |
0.20 |
0.10 |
0.20 |
0.38 |
0.19 |
0.14 |
| Wisconsin |
0.02 |
— |
0.04 |
0.77 |
0.30 |
0.05 |
0.10 |
0.17 |
0.81 |
0.50 |
0.28 |
0.14 |
|
West North Central
|
0.13
|
0.16
|
0.15
|
1.08
|
1.38
|
0.50
|
0.39
|
0.83
|
0.55
|
1.70
|
0.69
|
0.53
|
| Iowa |
— |
0.16 |
0.16 |
0.36 |
0.78 |
0.16 |
0.13 |
0.51 |
0.32 |
1.87 |
0.45 |
0.24 |
| Kansas |
0.14 |
0.14 |
0.14 |
0.69 |
1.18 |
0.62 |
0.41 |
0.62 |
0.41 |
0.79 |
0.51 |
0.52 |
| Minnesota |
0.02 |
0.08 |
0.02 |
0.63 |
0.57 |
0.11 |
0.05 |
0.69 |
0.23 |
0.61 |
0.30 |
0.17 |
| Missouri |
0.07 |
0.05 |
0.10 |
0.28 |
0.40 |
0.17 |
0.38 |
0.15 |
0.28 |
0.28 |
0.22 |
0.23 |
| Nebraska |
0.61 |
0.55 |
0.76 |
2.27 |
2.89 |
2.18 |
1.00 |
1.84 |
0.99 |
6.43 |
1.95 |
1.42 |
| North Dakota |
— |
0.30 |
0.15 |
5.56 |
8.86 |
1.63 |
1.33 |
3.18 |
2.65 |
7.89 |
3.16 |
2.14 |
| South Dakota |
0.74 |
0.49 |
— |
7.44 |
6.77 |
1.41 |
1.29 |
4.06 |
3.09 |
5.33 |
3.06 |
2.25 |
|
South Atlantic
|
0.03
|
0.06
|
0.11
|
0.30
|
0.06
|
0.06
|
0.12
|
0.05
|
0.14
|
0.26
|
0.12
|
0.09
|
| Delaware |
— |
— |
0.11 |
0.22 |
0.32 |
— |
— |
— |
— |
0.83 |
0.15 |
0.00 |
| District of Columbia |
0.34 |
0.50 |
1.61 |
1.26 |
— |
0.15 |
0.44 |
0.15 |
0.14 |
1.00 |
0.56 |
0.39 |
| Florida |
0.01 |
0.05 |
0.10 |
0.27 |
0.03 |
0.06 |
0.06 |
0.03 |
0.02 |
0.14 |
0.08 |
0.06 |
| Georgia |
0.04 |
0.04 |
0.14 |
0.46 |
0.04 |
0.11 |
0.13 |
0.04 |
0.42 |
0.29 |
0.17 |
0.12 |
| Maryland |
— |
0.29 |
0.17 |
0.42 |
0.19 |
0.10 |
0.52 |
0.10 |
0.08 |
0.58 |
0.25 |
0.18 |
| North Carolina |
— |
— |
0.02 |
0.07 |
0.03 |
— |
0.04 |
0.02 |
0.08 |
0.10 |
0.04 |
0.03 |
| South Carolina |
0.07 |
0.02 |
— |
0.42 |
0.06 |
0.06 |
— |
0.12 |
0.32 |
0.24 |
0.13 |
0.07 |
| Virginia |
0.06 |
0.05 |
0.10 |
0.24 |
0.07 |
0.06 |
0.16 |
0.07 |
0.14 |
0.45 |
0.14 |
0.09 |
| West Virginia |
— |
— |
0.11 |
0.27 |
0.05 |
— |
— |
— |
0.06 |
0.11 |
0.06 |
0.03 |
|
East South Central
|
0.21
|
0.04
|
0.30
|
0.93
|
0.26
|
0.20
|
0.19
|
0.25
|
0.61
|
0.35
|
0.33
|
0.26
|
| Alabama |
— |
0.02 |
0.10 |
0.79 |
0.06 |
— |
0.10 |
0.27 |
0.82 |
0.33 |
0.25 |
0.10 |
| Kentucky |
0.07 |
0.05 |
0.09 |
0.30 |
0.02 |
— |
0.02 |
0.11 |
0.20 |
0.20 |
0.11 |
0.08 |
| Mississippi |
1.05 |
0.10 |
1.04 |
3.45 |
0.90 |
0.87 |
0.84 |
0.90 |
1.54 |
1.04 |
1.17 |
0.97 |
| Tennessee |
0.06 |
0.03 |
0.25 |
0.29 |
0.26 |
0.18 |
0.08 |
0.05 |
0.33 |
0.16 |
0.17 |
0.17 |
|
West South Central
|
0.33
|
0.29
|
0.08
|
3.06
|
0.59
|
0.86
|
0.77
|
0.81
|
0.44
|
0.45
|
0.77
|
0.52
|
| Arkansas |
0.21 |
0.21 |
0.03 |
1.49 |
0.54 |
0.30 |
0.54 |
0.27 |
0.50 |
0.20 |
0.43 |
0.29 |
| Louisiana |
0.22 |
0.44 |
0.13 |
3.37 |
0.74 |
1.31 |
0.88 |
0.81 |
0.81 |
1.20 |
0.99 |
0.81 |
| Oklahoma |
0.22 |
0.03 |
0.03 |
2.70 |
1.56 |
0.23 |
1.25 |
0.53 |
0.86 |
0.30 |
0.77 |
0.42 |
| Texas |
0.37 |
0.31 |
0.08 |
3.24 |
0.43 |
0.94 |
0.71 |
0.90 |
0.31 |
0.38 |
0.77 |
0.41 |
|
Mountain
|
0.35
|
0.71
|
0.32
|
0.84
|
0.94
|
0.68
|
0.66
|
0.65
|
1.00
|
0.53
|
0.67
|
0.67
|
| Arizona |
0.19 |
1.67 |
0.76 |
1.33 |
0.75 |
1.19 |
0.98 |
0.82 |
1.39 |
0.35 |
0.94 |
0.90 |
| Colorado |
0.72 |
0.52 |
0.04 |
1.19 |
1.71 |
0.86 |
1.05 |
1.06 |
0.52 |
0.91 |
0.86 |
0.89 |
| Idaho |
0.58 |
— |
0.06 |
0.31 |
0.87 |
0.37 |
0.30 |
0.18 |
0.93 |
0.57 |
0.42 |
0.34 |
| Montana |
0.20 |
— |
0.10 |
0.10 |
0.99 |
0.20 |
0.29 |
0.29 |
0.28 |
2.35 |
0.48 |
0.24 |
| Nevada |
0.26 |
— |
0.44 |
0.18 |
0.29 |
0.11 |
0.14 |
0.45 |
1.04 |
0.10 |
0.30 |
0.22 |
| New Mexico |
0.29 |
1.02 |
0.19 |
1.15 |
1.15 |
0.91 |
0.57 |
0.29 |
1.10 |
0.24 |
0.69 |
0.74 |
| Utah |
0.04 |
0.04 |
0.04 |
0.11 |
0.14 |
0.03 |
0.17 |
0.23 |
1.26 |
0.22 |
0.23 |
0.13 |
| Wyoming |
0.71 |
0.35 |
0.18 |
0.52 |
2.75 |
— |
0.51 |
1.37 |
0.69 |
0.52 |
0.76 |
0.52 |
|
Pacific
|
0.19
|
0.15
|
0.22
|
0.59
|
0.48
|
1.11
|
1.13
|
0.65
|
0.78
|
0.30
|
0.56
|
0.54
|
| Alaska |
— |
— |
— |
— |
— |
— |
— |
— |
— |
0.14 |
0.01 |
0.00 |
| California |
0.18 |
0.19 |
0.29 |
0.78 |
0.62 |
1.45 |
1.50 |
0.85 |
1.02 |
0.39 |
0.73 |
0.70 |
| Hawaii |
— |
— |
— |
— |
— |
— |
— |
— |
— |
— |
0.00 |
0.00 |
| Oregon |
0.03 |
— |
— |
— |
0.18 |
0.18 |
— |
0.05 |
0.07 |
0.05 |
0.06 |
0.04 |
| Washington | 0.39 | 0.01 | — | 0.06 | — | 0.10 | 0.11 | 0.11 | 0.13 | 0.03 | 0.09 | 0.08 |
*Per 100,000 population, calculated using U.S. Census Bureau population estimates for July 1 for each year of the reporting period.
† No reported cases during this year.