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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.
Tunney et al. (Thu,) studied this question.