Background information of avian influenza H9N2 viruses examined in this study.
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aExpressed as the log10 EID50 required to give 1 MID50 or 1 MLD50.bLethality was determined by the mortality in 4-wk-old SPF chickens with intranasal infection with each of six H9N2 viruses at a dose 107 EID50. “Non” means no death of chickens over 21-day observation period.
创建时间：
2015-12-02
