Figure 2From: Production and characterization of recombinant pertactin, fimbriae 2 and fimbriae 3 from Bordetella pertussisAntibody responses in immunized and control mice. Two weeks after the second immunization, sera were collected, and IgG antibody titres were determined by ELISA. Results represent the mean antibody titres for five mice per group. An asterisk symbol (*) indicates a statistically significant difference (P < 0.001) between immunized and control group.Back to article page