FIG. 4.
Comparison of bactericidal activities against arcA strains carrying the pJRD215 and pJRD215::arcA plasmids. The arcA mutant, the wild-type strain (wt), and the arcA mutant complemented with plasmid-coded arcA were inoculated at a concentration of 107 CFU/ml into serum. After 1 h of incubation at 37°C, the numbers of CFU were determined by serial dilution (standard error, less than 5%).