lactam antibiotics are one kind of drugs with wide antimicrobial spectrum.They have a strong antimicrobial activity and little toxic effect.

• 内酰胺类抗生素是广谱抗菌药物,具有杀菌活性强、毒副作用小等特点,在兽医临床上应用广泛,其在畜产品中残留也日趋严重。