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Individual Pla-specific serum IgG reciprocal titers in groups of recently vaccinated (A-RV), earlier vaccinated (A-EV), and unvaccinated control donors (B). Data represent antibody titers with standard deviation (SD). The group titer comparative analysis was performed with Mann-Whitney test. Statistically significant differences are indicated by * (p<0.05) or *** (p<0.0001).
