TABLE 1. Number and percentage of reported cases of West Nile virus and other arboviral diseases, by virus type and selected patient characteristics — United States, 2015*.
| Characteristic | Virus type |
|||||
|---|---|---|---|---|---|---|
| West Nile (N = 2,175) |
La Crosse (N = 55) |
St. Louis encephalitis (N = 23) |
Jamestown Canyon (N = 11) |
Powassan (N = 7) |
Eastern equine encephalitis (N = 6) |
|
| No. (%) | No. (%) | No. (%) | No. (%) | No. (%) | No. (%) | |
|
Age group (yrs)
| ||||||
| <18 |
54 (2) |
51 (93) |
0 (0) |
1 (9) |
0 (0) |
1 (17) |
| 18–59 |
1,108 (51) |
1 (2) |
9 (39) |
6 (55) |
1 (14) |
2 (33) |
| ≥60 |
1,013 (47) |
3 (5) |
14 (61) |
4 (36) |
6 (86) |
3 (50) |
|
Sex
| ||||||
| Male |
1,289 (59) |
31 (56) |
15 (65) |
6 (55) |
5 (71) |
6 (100) |
| Female |
886 (41) |
24 (44) |
8 (35) |
5 (45) |
2 (29) |
0 (0) |
|
Period of illness onset
| ||||||
| January‒March |
2 (0) |
0 (0) |
0 (0) |
0 (0) |
0 (0) |
0 (0) |
| April‒June |
60 (3) |
7 (13) |
3 (13) |
5 (45) |
4 (57) |
1 (17) |
| July‒September |
1,804 (83) |
47 (85) |
19 (83) |
5 (45) |
1 (14) |
5 (83) |
| October‒December |
309 (14) |
1 (2) |
1 (4) |
1 (9) |
2 (29) |
0 (0) |
|
Clinical syndrome
| ||||||
| Nonneuroinvasive |
720 (33) |
4 (7) |
4 (17) |
5 (45) |
1 (14) |
0 (0) |
| Neuroinvasive |
1,455 (67) |
51 (93) |
19 (83) |
6 (55) |
6 (86) |
6 (100) |
| Encephalitis |
753 (35) |
40 (73) |
12 (52) |
4 (36) |
6 (86) |
2 (33) |
| Meningitis |
637 (29) |
10 (18) |
7 (30) |
1 (9) |
0 (0) |
2 (33) |
| Acute flaccid paralysis† |
118 (5) |
2 (4) |
1 (4) |
1 (9) |
0 (0) |
0 (0) |
| Other |
20 (1) |
0 (0) |
1 (4) |
1 (9) |
1 (14) |
0 (0) |
|
Outcome
| ||||||
| Hospitalization |
1,616 (74) |
52 (95) |
19 (83) |
9 (82) |
7 (100) |
6 (100) |
| Death | 146 (7) | 0 (0) | 2 (9) | 0 (0) | 1 (14) | 4 (67) |
* Four unspecified California serogroup virus cases and one Cache Valley virus case also were reported.
† Of the 118 West Nile virus disease patients with acute flaccid paralysis, 91 (77%) also had encephalitis or meningitis.