Table 5. Annual Incidence of brucellosis in humans by gender, age and location in Kajiado Kenya, 2015–2016.
| Characteristic | Population in the study cohort | Total enrolled febrile illness cases n (%) N = 236 | Number of confirmed Brucellosis cases N (%) (N = 7) | Point estimate annual incidence per 100,000 [95% CI) | Incidence ratio Estimate (95% CI) |
|---|---|---|---|---|---|
| Gender | |||||
| Male | 2484 (52.3) | 85 (36.0) | 1 (1.2) | 40 [38,43] | Ref |
| Female | 2262 (47.7) | 151 (64.0) | 3 (2.0) | 133 [128,138] | 3.3 [0.2–173.0] |
| Age group | |||||
| ≤20 | 2542 (53.6) | 30 (12.7) | 1 (0.04) | 39 [37,42] | Ref |
| 21–40 | 1388 (29.2) | 83 (35.2) | 2 (4.8) | 144 [138,151] | 3.6 [0.19–216.1] |
| 41–60 | 570 (12.0) | 79 (33.5) | 1 (1.3) | 175 [165,187] | 4.4 [0.05–350.1] |
| >60 | 246 (5.2) | 44 (18.6) | 0 (0.0) | 0 | - |
| Location | |||||
| Arroi | 425 (8.9) | 9 (3.8) | 0 (0.0) | 0 | - |
| Ilmuktani Mashuru Nka | 831 (17.5) | 93 (39.4) | 1 (1.1) | 120 [17,853] | 3.2 [0.04–255.3] |
| Mashuru | 787 (16.6) | 54 (22.9) | 2 (3.7) | 254 [64,1014] | 6.8 [0.35–405.2] |
| Nkama | 2703 (56.9) | 80 (33.9) | 1 (1.2) | 37 [5,262] | Ref |