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Representative plots of IL-4 and IFN-γ production within the lymphocyte population in an RSV-infected infant (a), control infant (b) and healthy adult (c) upon 6-h whole-blood activation with phorbol 12-myristate 13-acetate (PMA) and ionomycin in the presence of brefeldin A. Numbers indicate the percentage of single or double-stained lymphocytes.
