Table 2. Visibility of meningitis localized epidemics (LE) in Niger at the district level, by epidemic agent in health areas (HA).
Tahoua, Tillabery and Dosso regions, 2002–2012 and Dosso region, July 2014-June 2015.
| Number of HA with LE | Total population concerned by LE in the district (/103) | Annual incidence in the districts with LE | Peak weekly incidence in the districts with LE | Weekly incidence in the district when the LE definition was met | |
|---|---|---|---|---|---|
| Tahoua, Tillabery and Dosso regions, 2002–2012 | |||||
| Serogroup A | 98 | 47.6 (4.6–276.7) | 84 (21–179) | 16 (4–34) | 9 (1–30) |
| Serogroup W | 4 | 20.7 (5.8–61.2) | 42 (40–44) | 7 (5–9) | 5 (3–7) |
| Serogroup X | 4 | 25.2 (6.0–44.4) | 89 (24–155) | 50 (6–50) | 4 (1–6) |
| Other LE * | 56 | 14.1 (4.2–87.5) | 56 (7–166) | 12 (1–27) | 7 (0.2–26) |
| All LE combined | 162 | 32.6 (4.2–276.7) | 54 (7–179) | 15 (1–50) | 8 (0.2–30) |
| Dosso region, 2014–2015 | |||||
| Serogroup C | 9 | 97.8 (29.7–146.7) | 73 (43–86) | 17 (12–26) | 7 (3–10) |
| Serogroup W | 1 | 39.9 | 23 | 8 | 8 |
| Other LE ** | 3 | 66.4 | 43 | 17 | 6 (4–17) |
| All LE combined | 13 | 96.9 (39.9–146.7) | 58 (23–86) | 17 (8–26) | 8 (3–17) |
Localized epidemics were defined as weekly incidence at the HA level ≥20 per 100,000, maintained during ≥2 weeks. Figures are median (range). Annual and weekly incidences are rates per 100,000. LE, localized epidemic; HA, health area corresponding to the population served by one health center
* localized epidemics without laboratory investigation (N = 48), with equal presence of several meningococcal serogroups (N = 4) or exclusively etiology-negative samples of cerebrospinal fluid (N = 4)
** localized epidemics without laboratory investigation, occurred all in the same district