Tigecycline resistance was rare in isolates causing clinically significant infections in the UK and was overestimated ∼2-fold by the BSAC disc method. Adjustment of the breakpoints might overcome this problem but at the risk of increasing the false susceptibility rate. The best advice is to perform dilution tests, e.g. by gradient strip test on isolates with borderline results, especially in severe infection and when tigecycline use is intended.
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