Strains Serum heat treatment Survival ratio
E. coli DH5α - 0a
  + 8.6a
P. multocida    
P-1059 - 165 ± 57
  + 196 ± 64
hexB - 0.24 ± 0.07a
  + 126 ± 22a
P-1059C - 97 ± 19a
  + 142 ± 26a
a Significantly different at P<0.01 when compared to serum and heated serum treatment
Table 5: Resistance of E. coli DH5 and P. multocida strains to chicken serum.