Insecticide tolerance of the isolated strains were higher than that of standard strains E. coli K88, K99 by drugsensitive test.

• 纯化菌株的药敏试验结果表明，和大肠杆菌标准株K88、K99相比，不同猪场分离的大肠杆菌对抗菌素的耐药性都有较大增强。