Fig. 2.

Virus shedding in A/Panama/2007/99-infected animals. Ferrets were administered a low (1.5–2.3 FID₅₀), intermediate (15–23 FID₅₀), or high (100–526 FID₅₀) dose of virus IN (green) or by AR (orange), and transmission to naïve ferrets was assessed. Virus detection in nasal washes from inoculated animals is represented by transparent curves; virus titers in animals exposed by respiratory droplet contact are shown in light shades; and virus titers in animals exposed by direct contact are shown in dark shades. The level of detection is log₁₀ 0.7 pfu/mL.