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Transmissibility of A(H3N2)v influenza viruses among ferrets in the RD model. Three ferrets each were inoculated i.n. with 106 pfu of IN/11 virus (A), MN/10 virus (B), PA/10 virus (C), or KS/09 virus (D); a naïve ferret was placed in an adjacent cage at 24 h after inoculation to initiate contact. Nasal washes were collected from inoculated (dark bars) and contact (light bars) ferrets, and titers are expressed as log10 pfu/mL. Values for individual ferrets are shown.
