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, 2016*.
| Characteristic | Virus type, no. (%) |
|||||
|---|---|---|---|---|---|---|
| West Nile |
La Crosse |
Powassan |
Jamestown Canyon |
Saint Louis encephalitis |
Eastern equine encephalitis |
|
| (N = 2,150) | (N = 35) | (N = 22) | (N = 15) | (N = 8) | (N = 7) | |
|
Age group (yrs)
| ||||||
| <18 |
61 (3) |
28 (80) |
1 (5) |
0 (0) |
0 (0) |
1 (14) |
| 18–59 |
1,152 (54) |
5 (14) |
2 (9) |
7 (47) |
4 (50) |
2 (29) |
| ≥60 |
937 (44) |
2 (6) |
19 (86) |
8 (53) |
4 (50) |
4 (57) |
|
Sex
| ||||||
| Male |
1,326 (62) |
25 (71) |
14 (64) |
12 (80) |
5 (63) |
6 (86) |
| Female |
824 (38) |
10 (29) |
8 (36) |
3 (20) |
3 (38) |
1 (14) |
|
Period of illness onset
| ||||||
| January–March |
2 (<1) |
0 (0) |
1 (5) |
0 (0) |
0 (0) |
0 (0) |
| April–June |
88 (4) |
4 (11) |
6 (27) |
1 (7) |
1 (13) |
0 (0) |
| July–September |
1,781 (83) |
25 (71) |
3 (14) |
11 (73) |
7 (88) |
6 (86) |
| October–December |
279 (13) |
6 (17) |
12 (55) |
3 (20) |
0 (0) |
1 (14) |
|
Clinical syndrome
| ||||||
| Non-neuroinvasive |
840 (39) |
4 (11) |
1 (5) |
8 (53) |
1 (13) |
0 (0) |
| Neuroinvasive |
1,310 (61) |
31 (89) |
21 (95) |
7 (47) |
7 (88) |
7 (100) |
| Encephalitis |
689 (32) |
24 (69) |
15 (68) |
4 (27) |
6 (75) |
6 (86) |
| Meningitis |
468 (22) |
6 (17) |
3 (14) |
2 (13) |
0 (0) |
0 (0) |
| AFP† |
78 (4) |
0 (0) |
1 (5) |
0 (0) |
0 (0) |
0 (0) |
| Other |
75 (3) |
1 (3) |
2 (9) |
1 (7) |
1 (13) |
1 (14) |
|
Outcome
| ||||||
| Hospitalization |
1,465 (68) |
32 (91) |
20 (91) |
7 (47) |
8 (100) |
7 (100) |
| Death | 106 (5) | 0 (0) | 3 (14) | 0 (0) | 2 (25) | 3 (43) |
Abbreviation: AFP = acute flaccid paralysis.
* Three unspecified California serogroup virus cases were also reported.
† Of the 78 West Nile virus disease patients with AFP, 44 (56%) also had encephalitis or meningitis; the additional AFP patient with Powassan virus also had encephalitis.