| Summary: | Objectives: We report the successful treatment of a bloodstream infection caused by Klebsiella pneumoniae harbouring NDM-1 using aztreonam-ceftazidime-avibactam in a neutropenic patient in whom colistin and meropenem therapy had previously failed.
Methods: A clinical isolate was evaluated to determine the presence of NDM, TEM, SHV, CTX, and CMY, and the killing kinetics of aztreonam (ATM; 4 mg/mL), aztreonam-avibactam (ATM-AVI; 4/4 mg/mL), and colistin (2 and 4 mg/mL) were tested.
Results: ATM-AVI showed in vitro activity against the Klebsiella pneumoniae harbouring NDM-1, whereas
colistin allowed re-growth.
Conclusions: This report supports reconsideration of use of colistin for treatment of infections caused by
K. pneumoniae harbouring NDM. CZA/ATM use should be kept in mind as a treatment option, perhaps earlier than colistin.
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