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, 2017.
| Characteristic | Virus
no. (%) |
|||||
|---|---|---|---|---|---|---|
| West Nile* (N = 2,097) | Jamestown Canyon (N = 75) | La Crosse (N = 63) | Powassan (N = 34) | St. Louis encephalitis* (N = 11) | Eastern equine encephalitis (N = 5) | |
|
Age group (yrs)
| ||||||
| <18 |
50 (2) |
4 (5) |
54 (86) |
5 (15) |
0 (0) |
0 (0) |
| 18–59 |
1,020 (49) |
36 (48) |
6 (10) |
10 (29) |
5 (45) |
5 (100) |
| ≥60 |
1,027 (49) |
35 (47) |
3 (5) |
19 (56) |
6 (55) |
0 (0) |
|
Sex
| ||||||
| Male |
1,301 (62) |
46 (61) |
34 (54) |
28 (82) |
8 (73) |
2 (40) |
| Female |
796 (38) |
29 (39) |
29 (46) |
6 (18) |
3 (27) |
3 (60) |
|
Period of illness onset
| ||||||
| January–March |
7 (<1) |
1 (1) |
1 (2) |
0 (0) |
1 (9) |
0 (0) |
| April–June |
87 (4) |
25 (33) |
4 (6) |
21 (62) |
0 (0) |
0 (0) |
| July–September |
1,814 (87) |
45 (60) |
53 (84) |
7 (21) |
8 (73) |
1 (20) |
| October–December |
185 (9) |
4 (5) |
5 (8) |
6 (18) |
1 (9) |
4 (80) |
|
Clinical syndrome
| ||||||
| Nonneuroinvasive |
672 (32) |
17 (23) |
0 (0) |
1 (3) |
5 (45) |
0 (0) |
| Neuroinvasive | ||||||
| Encephalitis |
714 (34) |
29 (39) |
53 (84) |
22 (65) |
2 (18) |
3 (60) |
| Meningitis |
530 (25) |
5 (7) |
10 (16) |
7 (21) |
3 (27) |
0 (0) |
| AFP |
89 (4) |
4 (5) |
0 (0) |
2 (6) |
1 (9) |
0 (0) |
| Other |
92 (4) |
20 (27) |
0 (0) |
2 (6) |
0 (0) |
2 (40) |
|
Outcome
| ||||||
| Hospitalization |
1,545 (74) |
46 (61) |
63 (100) |
33 (97) |
6 (55) |
5 (100) |
| Death | 146 (7) | 2 (3) | 0 (0) | 2 (6) | 0 (0) | 2 (40) |
Abbreviation: AFP = acute flaccid paralysis.
*Date of illness onset missing for four cases of West Nile virus and one case of St. Louis encephalitis virus.