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Post-vaccination seroconversion and seroprotection rates. (A) Seroconversion rate: percentage of subjects achieving at least a 4-fold increase or an increase from >10 to 40 in Ab titer for seronegative subjects; (B) Seroprotection rate: percentage of subjects reaching an Ab titer 40. *Significantly different between P and D group using Mann-Whitney U-test (p < 0.05).
