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Bacterial resistance to SPF chicken serum. The APCE94, APCE94ΔeivC, and APCE94CΔeivC strains were incubated with SPF chicken sera at different dilutions at 37°C for 30 min, and the surviving bacteria were enumerated. This data revealed that the mutant strain APCE94ΔeivC was significantly and highly susceptible to SPF chicken sera. A two-way ANOVA was performed for the survival assays (∗∗p < 0.01).
