Methods Observe the regularity of growth of bacterial strain by determining the de nsity of culture,and detect the expression of fimbrial antigen by dot ELISA and whole cell ELISA.

• 方法通过测定培养物的密度,观察疫苗菌株的生长规律,用斑点ELISA和全菌ELISA检测菌毛抗原的表达情况。