FIG 3.

Mean (n = 6) ferret nasal wash influenza A virus (IAV) titers are shown by swine group exposure: live-attenuated influenza virus (LAIV), killed influenza virus (KV), or sham vaccine (NV). N = 6 ferrets per group. Titers at or below the assay limit of detection (LOD; 1.5 log TCID₅₀/ml) were assigned a nominal value of 0.0 for mean calculations. Individual ferret nasal titer data are shown separately in the supplemental material (Fig. S3). Spikes indicate standard errors of the means (SEM). The lower x axis indicates individual study days, and values are skewed (±0.1) to allow comparison of overlapping error bars. The upper x axis denotes timeline points of interest. Fomite transfer occurred between pigs and near-exposed (NE) ferrets only. The corresponding table below the line plot indicates the number of animals shedding infectious virus, defined as an individual titer in excess of the assay LOD by study day.