Figure 4From: Production and characterization of recombinant pertactin, fimbriae 2 and fimbriae 3 from Bordetella pertussisProtection against intranasal challenge with B. pertussis. Two weeks after the second immunization, the mice were challenged intranasally with B. pertussis 18323, and CFU counts were performed on individual lung homogenate. Results are mean viable B. pertussis counts from five mice per group. An asterisk symbol (*) indicates a statistically significant difference (P < 0.05) between immunized and control group.Back to article page