Methods: The culture supernatant of cord blood LAK cells and diluted E.coli suspension were cocultured in agar medium and the colonies of E.coli were counted.

• 方法将脐血LAK细胞培养上清液和稀释的埃希氏大肠杆菌悬液混合,在培养皿内培养不同时间,计数各个培养皿内细菌菌落数。