Screen the optimal stabilizer according to the appearance, virus titer and thermostability of the freeze-dried vaccine.
根据冻干后外观、病毒滴度和热稳定性试验等结果，筛选出冻干保护剂的最适配方。
Methods: The chicken embryo culture was used to observe the inhibition of MEPS on type A influenza virus by hemagglutination test in terms of hemagglutination titer.
方法：采用血凝滴度测定研究MEPS对鸡胚培养甲型流感病毒的抑制作用。
Results: According to hemagglutination titer, it was proved that most of Radix Isatidis and Folium Isatidis were effective to influenza a virus in 3 aspects: direct, therapeutic and preventive action.
结果：血凝滴度实验表明，在对甲型流感病毒的直接作用、治疗作用和预防作用3方面大多数板蓝根和大青叶有效，但各种质药材样品抗病毒活性的有无及强度有明显差异。
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