Journal
ANTIMICROBIAL AGENTS AND CHEMOTHERAPY
Volume 48, Issue 5, Pages 1879-1881Publisher
AMER SOC MICROBIOLOGY
DOI: 10.1128/AAC.48.5.1879-1881.2004
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A colorimetric assay based on the reduction of a tetrazolium salt {2,3-bis[2-methyloxy-4-nitro-5-sulfophenyl]-2H-tetrazolium-5-carboxanilide (XTT)} for rapidly determining the susceptibility of Pseudomonas aeruginosa isolates to bactericidal antibiotics is described. There was excellent agreement between the tobramycin and ofloxacin MICs determined after 5 h using the XTT assay and after 18 h using conventional methods. The data suggests that an XTT-based assay could provide a useful method for rapidly determining the susceptibility of P. aeruginosa to bactericidal antibiotics.
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