微生物学
细菌
鲍曼不动杆菌
头孢噻肟
抗生素
人口
大肠杆菌
细菌生长
肺炎克雷伯菌
细胞外
生物
妥布霉素
细菌细胞结构
化学
生物化学
铜绿假单胞菌
医学
庆大霉素
基因
环境卫生
遗传学
作者
Gretchen Tibbits,Abdelrhman Mohamed,Douglas R. Call,Haluk Beyenal
标识
DOI:10.1016/j.bios.2021.113754
摘要
Conventional methods for testing antibiotic susceptibility rely on bacterial growth on agar plates (diffusion assays) or in liquid culture (microdilution assays). These time-consuming assays use population growth as a proxy for cellular respiration. Herein we propose to use mediated extracellular electron transfer as a rapid and direct method to classify antibiotic-susceptible and -resistant bacteria. We tested antibiotics with diverse mechanisms of action (ciprofloxacin, imipenem, oxacillin, or tobramycin) with four important nosocomial pathogens (Acinetobacter baumannii, Staphylococcus aureus, Escherichia coli, and Klebsiella pneumoniae) by adding the bacterial culture to a custom-designed electrochemical cell with a glassy-carbon electrode and growth media supplemented with a soluble electron transfer mediator, phenazine methosulfate (PMS). During cell respiration, liberated electrons reduce PMS, which is then oxidized on the electrode surface, and current is recorded. Using this novel approach, we were able to consistently classify strains as antibiotic-resistant or -susceptible in <90 min for methodology development and <150 min for blinded tests.
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