Virulence and death pattern of mice infected with different H9N2 viruses.

Abstract

<p>Five-week-old BALB/c mice (five/group) were inoculated intranasally with different H9N2 viruses, SD16 (A), SD16-MA (B), SD16:MA PB2 (C), or SD16-M147L/E627K (D). Doses of 10⁴ to 10⁶ pfu (A) or 10² to 10⁵ pfu (B, C, D) were used.</p