Survival percentage of mice after H9N2 viral infection.

<p>Groups of mice (n = 14) were inoculated i.n. with each of six H9N2 viruses at a dose of 10⁷ EID₅₀ (<i>A</i>), 10⁶ EID₅₀ (<i>B</i>), 10⁵ EID₅₀ (<i>C</i>) or 10⁴ EID₅₀ (<i>D</i>), respectively. Percent survival was observed daily for 14 days.