Table 2.
Risk factors according to region, production characteristics and hygienic and sanitary handling associated with infection by Chlamydophila abortus in sheep in the State of Alagoas, Brazil, 2008
| Variable | N | CFR n (%) | Univariate Analysis | |
|---|---|---|---|---|
| OR (T.I. 95%) | P | |||
| Region | ||||
| East | 144 | 19 (13.2) | 1.0 | 0.001* |
| Agreste | 49 | 12 (24.5) | 2.13 (0.95 ; 4.79) | |
| Sertão | 81 | 28 (34.6) | 3.48 (1.79 ; 6.79) | |
| Size of property (ha) | ||||
| < 30 | 35 | 8 (22.9) | 1.0 | 0.516 |
| Between 30 and 200 | 101 | 18 (17.8) | 0.73 (0.29 ; 1.87) | |
| Above 200 | 138 | 33 (23.9) | 1.06 (0.44 ; 2.56) | |
| Number of animals (head) | ||||
| < 50 | 82 | 18 (22.0) | 1.0 | 0.570 |
| Between 50 and 100 | 89 | 22 (24.7) | 1.17 (0.57 ; 2.38) | |
| Above 100 | 103 | 19 (18.4) | 0.80 (0.39 ; 1.66) | |
| Rearing system | ||||
| Intensive | 40 | 13 (32.5) | 1.0 | 0.189 |
| Extensive | 72 | 14 (19.4) | 0.50 (0.21 ; 1.21) | |
| Semi-intensive | 162 | 32 (19.8) | 0.51 (0.24 ; 1.10) | |
| Water source | ||||
| Still | 69 | 21 (30.4) | 1.0 | 0.108 |
| Running | 92 | 16 (17.4) | 0.48 (0.23 ; 1.01) | |
| Still + Running | 113 | 22 (19.5) | 0.55 (0.28 ; 1.11) | |
| Feeding | ||||
| With supplementation | 56 | 11 (19.6) | 1.0 | 0.701 |
| Without supplementation | 218 | 48 (22.0) | 1.15 (0.55 ; 2.40) | |
| Common water troughs for young and adult animals | ||||
| No | 6 | 4 (66.7) | 1.0 | 0.021* |
| Yes | 268 | 55 (20.5) | 0.13 (0.02 ; 0.72) | |
N – Total number of animals for each variable; RFC – Complement fixation reaction; OR – odds ratio; T.I. – Trust interval