Fig 4. Volume of aerosols exhaled by naïve and influenza virus inoculated ferrets.

Aerosol volumes were measured from ferrets during 15 minutes of normal breathing (NB) or 5 minutes of sneezing stimulation (SZ). Data collected from naïve animals, n = 6 (A), and data collected from inoculated animals (normalized to each ferret’s naïve level of aerosol shedding), n = 3, on 2, 4 and 6 dpi were combined and compared between PN99 and IN11 virus groups for aerosols <5 μm and ≥5 μm (B,C). Ferrets were housed under controlled environmental conditions as indicated. Data are presented + standard deviation.