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Maternal and infant RSV neutralizing activity (IC80) at birth. (A) RSV-A and (B) RSV-B. Data show log transformed (base 2) reciprocal IC80 sera dilution for mothers and infants in healthy controls, ILI (RSV neg), and RSV (ILI pos) groups. Abbreviations: IC80, 80% inhibitory concentration; ILI, influenza-like illness; RSV, respiratory syncytial virus.
