Table 1. Proportion of encephalitis patients with history of reported exposures to drinking date palm sap or contact with patients with encephalitis by Nipah serodiagnosis in 3 surveillance hospitals, Bangladesh, 2012–13 Nipah virus season.
| Reported risk factor |
Overall, Dec–Mar, no. (%) | Peak incidence during Jan–Feb, no. (%) | |||||
|---|---|---|---|---|---|---|---|
| IgM positive, n = 17 |
IgM negative, n = 311 |
Total, n = 328 |
|
IgM positive, n = 15 |
IgM negative, n = 132 |
Total, n = 147 |
|
| History of drinking raw date palm sap | 9 (47) | 45 (14) | 54 (16) | 9 (60) | 24 (18) | 33 (22) | |
| History of drinking fermented date palm sap | 2 (11) | 0 | 2 (1) | 2 (13) | 0 | 2 (1) | |
| History of contact with other encephalitis patients | 3 (18) | 0 | 3 (1) | 3 (20) | 0 | 3 (2) | |
| No history of drinking raw or fermented date palm sap or contact with encephalitis patients | 3 (18) | 266 (86) | 269 (82) | 1 (7) | 108 (5) | 109 (47) | |