Purpose Of Review: Stenotrophomonas maltophilia is an emerged opportunistic pathogen. Intrinsic multidrug resistance makes treating infections caused by S. maltophilia a great clinical challenge. Herein, we provide an update on the most recent literature on treatment options for severe S. maltophilia infections.
Recent Findings: Trimethoprim-sulfamethoxazole (SXT) is recognized as the first-line therapy for S. maltophilia infections. However, its clinical use is based on good in vitro activity and favorable clinical outcomes, rather than on solid minimum inhibitory concentration (MIC) correlations with pharmacokinetic/pharmacodynamics (PK/PD) and/or clinical outcomes. The same is true for other treatment options like levofloxacin (LVX) and minocycline (MIN). Recent PK/PD studies question the current clinical breakpoints for SXT, LVX, and MIN. Based on this, the latest guidance issued by the Infectious Diseases Society of America (IDSA) recommends using these agents only as part of a combination therapy. Alternatively, novel therapeutic options such as cefiderocol (FDC) and ceftazidime-avibactam plus aztreonam (CZA-ATM) are suggested, based on limited but promising clinical data.
Summary: PK/PD data and controlled clinical studies are needed to optimize current treatment options. Presently, combination therapy of SXT, LVX, MIN, or FDC, or monotherapy with CZA-ATM are recommended therapeutic options for severe-to-moderate S. maltophilia infections.
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