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Serological responses against the P1.7-2,4 and P1.5-1,2-2 serosubtypes after liposome or OMV immunization on days 0 and 28. Avidity is indicated as the percentage of titers that remains when ELISA plates are incubated with 1.5 M of NaSCN. SBA titers are expressed as the serum dilution resulting in 90% killing of the homologous strains. Data are from one experiment with five mice per group. Error bars indicate SEM. P values are indicated, where * is <0.01 and ** is <0.001.
