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Viral nasal wash titers. Nasal washes were performed on days 1, 3, 5 and 7 postinfection. The titers are recorded as log10 PFU/ml. The H2N2 preimmune ferrets are shown in panels A to D. The H3N2 preimmune ferrets are shown in panels E to H. The H1N1 preimmune ferrets are shown in panels I to L. The nonpreimmune ferrets are shown in panels M to P. The height of the bars shows the mean while the error bars represent mean standard error.
