1887

Abstract

The susceptibility to triclosan of 732 clinical isolates obtained from 25 hospitals in 16 cities in China from December 2004 to December 2005 was screened by using an agar dilution method. Triclosan MICs ranged between 0.015 and 16 mg l, and the MIC was 0.5 mg l, lower than the actual in-use concentration of triclosan. Twenty triclosan-resistant isolates (MICs ≥1 mg l) were characterized by antibiotic susceptibility, clonal relatedness, mutation, expression, and efflux pump phenotype and expression to elucidate the resistance mechanism of to triclosan. The resistance rates of triclosan-resistant isolates to imipenem, levofloxacin, amikacin and tetracycline were higher than those of triclosan-sensitive isolates. Triclosan resistance was artificially classified as low level (MICs 1–2 mg l) or high level (MICs ≥4 mg l). High-level triclosan resistance could be explained by a Gly95Ser mutation of FabI, whilst wild-type was observed to be overexpressed in low-level resistant isolates. Active efflux did not appear to be a major reason for acquired triclosan resistance, but acquisition of resistance appeared to be dependent on a background of intrinsic triclosan efflux.

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2009-08-01
2019-10-13
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