FIG. 3.
Serum antimicrobial resistance of the RB50 strain of B. bronchiseptica, the FR107 strain of B. parapertussisov, the 12822 strain of B. parapertussishu, and the Tohama I strain of B. pertussis. Bacteria were grown to mid-log phase in SS broth and diluted in PBS so that a total of 1,000 bacteria were incubated at 37°C for 1 h in 100 μl of 90% serum obtained from rabbits that were Bordetella free (naive) or immunized with heat-killed RB50, Fr107, 12822, or Tohama I. Bars represent means ± SE (n = 3).