Methods: The antiviral effects of Rhizoma et Radix Baphicacanthis Cusiae and Radix Isatidis on influenza A virus were observed in chick-embryo culture using Ribavirin as positive control.

• 方法：用鸡胚培养法观察两种板蓝根对甲型流感病毒的直接作用、治疗作用及预防作用，以利巴韦林为阳性对照药。