Clinical signs, virus replication, and seroconversion in inoculated donor ferrets.

an = 1 for each virus group. bThe maximum percent weight loss during the 21 days p.i. Numbers in parentheses indicate the day of maximum weight loss. cUpper respiratory tract inflammation was defined as a total inflammatory cell count ≥10 times the baseline count. dVirus titers in nasal washes (log10TCID50/ml). eThe first day of observation on which virus was not detected. fHemagglutination inhibition (HI) antibody titers to homologous virus 21 days p.i. gCo-inoculation of ferret with A/DM/524/09 and A/DM/528/09 viruses at 1∶1 ratio.