众多研究结果表明 ,进入机体内的致病菌的彻底清除 ,依赖于机体自身免疫系统与外界抗菌药物的共同作用[1,2 ] 。对于患病动物而言 ,正是由于机体防御机能和病原菌之间的作用平衡被打乱而使病原微生物得以在其体内大量繁衍。已有研究结果表明 ,选用适当的抗菌药物不仅能使进入机 Numerous studies show that the thorough removal of pathogens entering the body depends on the interaction of the body’s own immune system and the external antibacterial drugs [1,2]. For diseased animals, it is precisely because of the balance between the defense function of the body and the balance between pathogenic bacteria disrupted that the pathogenic microorganisms can multiply in their bodies. Research has shown that the use of appropriate antibacterial drugs not only make the machine into the machine