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Abstract: Stenotrophomonas maltophilia is an important etiological factor of infections in patients with compromised immune systems, undergoing invasive diagnostic and therapeutic procedures, as well as in those suffering from cancer or cystic fibrosis. It poses a threat primarily to hospitalized patients. Due to its broad natural resistance and increasing acquired resistance, the therapy of infections caused by this pathogen is a challenge for modern medicine. The paper presents the current knowledge about the general characteristics, clinical significance and the most important pathogenicity factors of S. maltophilia. It also discusses therapeutic possibilities, including alternative ones, in infections caused by these microorganisms.