Pathological analysis of the lung tissues of challenged BALB/c mice.

<p>Ten mice from each group were euthanized at 5 d.p.i. to obtain lung tissue biopsies, and for each lung three 4-µm sections were stained with H&E for pathological investigations. (A) Representative sections of H&E stained lung tissues from 10⁶ TCID₅₀ intranasally challenged mice. (B) Percentage of lesion area in lung tissues.