Figure 1.
Viral titers in the respiratory tracts of vaccinated and saline control ferrets after challenge with A/Anhui/1/2013 (H7N9) virus. Virus titers in the upper respiratory tract were determined from nasal wash samples collected on days 3, 5, and 7 after challenge. Viral titers are presented as means and standard deviations. Linear mixed model with Kenward–Roger corrections were applied to investigate log10 -transformed viral titers across various groups, and differences were considered statistically significant at P ≤ .05. Abbreviations: PBS, phosphate-buffered saline; TCID50, tissue culture infectious dose-50.