TABLE 3.
Score-based evaluation of gross lesions in organs of infected chickens
| E. coli strain | Mean lesion score ± SEMa
|
|
|---|---|---|
| Air sacsb | Liver and heartc | |
| χ7122 | 2.7 ± 0.2 | 3.2 ± 0.3 |
| χ7304 (Δiro ΔiucABC iutA) | 1.5 ± 0.4* | 0.8 ± 0.3** |
| χ7304(pYA3661 iroBCDEN) | 2.8 ± 0.3 | 3.2 ± 0.2 |
| χ7304(pIJ34 iroBCDE) | 1.6 ± 0.4* | 1.3 ± 0.5* |
| χ7304(pIJ37 iroBDEN) | 1.4 ± 0.3** | 1.0 ± 0.2** |
| χ7304(pIJ135 iroBCN) | 1.4 ± 0.3** | 0.8 ± 0.1** |
| χ7304(pIJ136 iroBCEN) | 1.9 ± 0.3 | 1.4 ± 0.1** |
| χ7304(pIJ137 iroBCDN) | 2.7 ± 0.3 | 2.4 ± 0.4 |
a
Lesion scores are presented as the mean (± standard error of the mean [SEM]) of values attributed to gross lesions of airsacculitis and combined lesions of perihepatitis/and perihepatitis as described in reference 33.
b
Mean lesion scores for airsacculitis in both caudal thoracic air sacs.
c
Combined lesion scoring values for pericarditis and perihepatitis. Statistical differences compared with the wild-type strain using the two-tailed Mann-Whitney test are noted: * and **, P < 0.05 and P < 0.001, respectively.