Fig. 4.

Virus shedding following influenza challenge. a Ferrets were infected intranasally with cell-grown HK/4801, nasal washes were taken on days 1–7 and 9, and virus titers were determined by TCID₅₀. Titers are shown for Rep 1 and Rep 2. Error bars represent one standard deviation; six ferrets per group until day 2 then three ferrets per group. b As above, with replicates combined and normalized to the highest titer found in each replicate. c Statistical significances of the differences between groups, as measured using a linear mixed model with repeated measures