Figure 3.

Predicted influenza virus shedding duration by high and low pre-existing neuraminidase antibody levels. Curves show the proportion of people still positive by reverse transcriptase-polymerase chain reaction (y axis) each day since the start of shedding (x axis) for an adult female of average age (36 y). Mean (interquartile range) shedding times are presented in the inset. Abbreviations: IQR, interquartile range; NA, neuraminidase; Prop, proportion; RT-PCR, reverse transcriptase–polymerase chain reaction.