Table 3. Acute encephalitis syndrome expected and observed cases and incidence rates (IR) per 100,000 person years in Nepal.
| Campaign target population |
Campaign year |
Expected | Observed | Percent difference in IR |
95% confidence interval |
|||
|---|---|---|---|---|---|---|---|---|
| Cases | IR | Cases | IR | |||||
| Vaccinated districts (n = 31) | Variable | 2006–11 | 15,978 | 13.7 | 6,481 | 5.5 | -59% | (-60%, -58%) |
| Ecologic and risk area | ||||||||
| Terai high-risk (n = 4) | ≥1 yr | 2006 | 7,830 | 41.5 | 905 | 4.8 | -88% | (-89%, -88%) |
| Terai moderate risk (n = 20) | Variable | 2006–11 | 5,897 | 7.4 | 4,267 | 5.3 | -28% | (-30%, -25%) |
| Hill moderate risk (n = 7) | Variable | 2008–11 | 2,251 | 12.6 | 1,309 | 7.3 | -42% | (-45%, -39%) |