TABLE 5.
Resistance of E. coli DH5α and P. multocida strains X-73, PBA930, and PBA954 to chicken serum
| Strain | Serum heat treatment | Survival ratioa |
|---|---|---|
| E. coli DH5α | − | 0b |
| + | 10.4b | |
| P. multocida | ||
| X-73 | − | 200 ± 82c |
| + | 200 ± 90 | |
| PBA930 | − | 0.50 ± 0.22bc |
| + | 123 ± 32b | |
| PBA954 | − | 28.3 ± 5.8c |
| + | 65 ± 28 |
a
Survival rate = (CFU/ml at t = 3h)/(CFU/ml at t = 0h).
b
Survival ratios for serum and heated serum were significantly different (P = 0.003).
c
The P values for the difference in the survival ratios for both P. multocida X-73 and PBA954 compared with that of PBA930 were both significant (0.02 and 0.001, respectively).