Replication and virulence of H9N2 viruses in mice.

<p>Virus titers in organs of mice on day 3 p.i. with 10⁶ EID₅₀ of test virus. Data shown are the mean titers from three mice; the error bars indicate the standard deviations. *, mice inoculated with CK/ZJ/C1219/10-PB2/627K virus died before day 8 p.i. The dashed line indicates the lower limit of detection.