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Replication kinetics of H3 influenza viruses in ferrets following i.n. inoculation of 107 TCID50/virus. Virus titers in the nasal turbinates (A) and lungs (B) of 3 ferrets per group sacrificed on 1, 3, and 5 dpi are expressed as log10 TCID50/gram of tissue. Horizontal bars represent mean titers, and symbols represent titers from individual ferrets. The dashed horizontal line indicates the lower limit of detection, 101.5 TCID50 per gram for the NT and lungs.
