challenge strain造句

The result further proposed that different genotypes of ndv had not directed the antigenic changes of f protein , the most important protein of ndv in the protective immune response of the fowls . protective efficacy difference among various genotype ndv vaccines of different origin was studied . except the vaccine strain lasota ( genotype ii ) , the challenge strain f48e8 in china , the ndv strains tested were isolated from nd outbreaks in chickens , gooses , and pigeons
通过不同来源不同基因型(亚型) ndv灭活苗与常规疫苗(包括lasota弱毒活疫苗和灭活疫苗)的免疫保护效力的比较，证实了所有疫苗均能激发机体产生抗不同基因型ndv的抵抗力， hl抗体变化都具有一个抗体滴度迅速上升的过程，动态特征除lasota弱毒活疫苗组有些不同外相当一致。
It's difficult to find challenge strain in a sentence. 用challenge strain造句挺难的