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Individual memory B cell frequencies in four age groups. Bmems, memory B cell frequencies; PBMCs, peripheral blood mononuclear cells; D0, day 0 (baseline); D28, day 28 post-vaccination; Y1, 1 year post-vaccination. Memory B cell frequencies specific for (A) pertussis toxin; (B) filamentous haemagglutinin; and (C) pertactin. Presented in truncated violin plots. Corresponding geometric mean frequencies and 95% confidence interval are presented in Table 2 .
