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Colistin is a polypeptide antibiotic with significant activity in vitro against some multi-resistant gram-negative pathogens. 粘桿菌素是一類對(duì)革蘭氏陰性致病菌具有很強(qiáng)體外抗性的多肽抗生素,能治療由多重耐藥性病菌引起的多種疾病。