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A(H1N1)pdm09-specific memory B-cell responses in study B. The graphs shown represent the frequencies of antigen-specific memory B cells in the total number of IgG-producing memory B cells induced by the AS03-adjuvanted or nonadjuvanted A(H1N1)pdm09 (H1N1) vaccine. The data are stratified either by age (A) or by the participants' history of seasonal influenza vaccination (Flu/No flu; B), y, years. M, month. Q1 and Q3, first and third quartiles. Min and Max, minimum and maximum values.
