Abstract
Multidrug resistance Acinetobacter baumannii (A. baumannii) (MDRAB) has emerged as a serious threat in hospitals in recent years. Currently, there are few antibiotics, including tigecycline, available to treat infections caused by MDRAB effectively. Both tigecycline-resistant and tigecycline-susceptible isogenic strains of MDRAB are valuable in understanding the mechanisms underlying tigecycline resistance. To get the isogenic strains in the laboratory, we describe a protocol for induction of tigecycline resistance in A. buamannii by serial passage to plates with tigecycline of different concentrations. The minimal inhibitory concentration of A. baumannii by tigecycline was determined according to the protocol “Minimal Inhibitory Concentration (MIC) Assay for Acinetobacter baumannii” (Lin et al., 2014b).