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. 2015 Jan 22;11(2):421–427. doi: 10.4161/21645515.2014.988549

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Figure 2. — Levels of antigen-specific IgG in mice immunized with different pertussis vaccines. Sera from control mice and immunized mice were determined by ELISA. Antibody level (EU/mL) is calculated against mouse serum reference NIBSC 97/642. Results represent the geometric mean antibody titres for 5 mice per group. *indicates a statistically significant difference (P < 0.05) compared with WPV (S1) group; # indicates a statistically significant difference (P < 0.05) compared with co-purified APV (S2 and S3) groups.