Figure 4: Virus shedding and proportion of genotypes in nasal wash from ferrets infected with a mixture of genotypes with transmission by direct contact or respiratory droplet routes.

Infectious virus shed in nasal wash obtained from ferrets after infection or exposure to infected ferrets is plotted as PFU/ml on the right hand side y axis. The percentage of genotype B1 (green) or B2 (blue) established by pyrosequencing RNA extracted from nasal wash is plotted on the left hand side y axis.