TABLE 4. Number and percentage of persons with West Nile virus neuroinvasive disease, by demographic characteristics, clinical outcomes, and clinical syndrome* — United States, 2009–2018.
| Characteristic | Encephalitis (N = 6,744) |
Meningitis (N = 4,781) |
Acute flaccid paralysis (N = 937) |
Unspecified (N = 373) |
|---|---|---|---|---|
| No. (%) | No. (%) | No. (%) | No. (%) | |
|
Age group (yrs)
| ||||
| <20 |
166 (2) |
237 (5) |
12 (1) |
9 (2) |
| 20–39 |
456 (7) |
1,044 (22) |
96 (10) |
28 (8) |
| 40–59 |
1,805 (27) |
1,889 (40) |
345 (37) |
118 (32) |
| ≥60 |
4,316 (64) |
1,611 (34) |
484 (52) |
218 (58) |
| Unknown |
1 (<1) |
0 (0) |
0 (0) |
0 (0) |
|
Sex
| ||||
| Female |
2485 (37) |
1,941 (41) |
318 (34) |
144 (39) |
| Male |
4,259 (63) |
2,840 (59) |
619 (66) |
229 (61) |
|
Hospitalization
| ||||
| Yes |
6,505 (96) |
4,398 (92) |
903 (96) |
305 (82) |
| No |
210 (3) |
348 (7) |
33 (4) |
63 (17) |
| Unknown |
29 (1) |
35 (1) |
1 (<1) |
5 (1) |
|
Death
| ||||
| Yes |
913 (14) |
101 (2) |
121 (13) |
19 (5) |
| No |
5,535 (82) |
4,517 (94) |
778 (83) |
335 (90) |
| Unknown | 293 (4) | 163 (3) | 38 (4) | 19 (5) |
*N = 12,835. Clinical syndrome categories are mutually exclusive. Percentages might not sum to 100% because of rounding.