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Avidity of EtpA-specific serum antibody following EtpA vaccination with dmLT varies with both dose and route of immunization. (a) EtpA-specific serum IgG avidity following oragastric immunization with rEtpA or intradermal (ID) vaccination. (b) EtpA-specific IgA avidity index after orogastric and intradermal vaccination. Statistical analysis results (**, P = 0.002; ***, P = 0.0002) reflect Mann-Whitney, two-tailed nonparametric comparisons.
