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Stenotrophomonas maltophilia - a low-grade pathogen with numerous virulence factors.
Infectious Diseases 2018 November 14
Stenotrophomonas maltophilia is an increasingly prevalent opportunistic pathogen responsible for a wide range of nosocomial infections in intensive care unit patients, life-threatening diseases in immunocompromised haematology-oncology patients and chronic pulmonary infections in individuals with cystic fibrosis. Therapy of these infections is problematic due to the remarkable intrinsic antimicrobial resistance of the species and to acquired resistance to multiple antimicrobial agents. As this organism is a low-grade pathogen, the pathogenesis of S. maltophilia infections involves numerous virulence factors as well as the ability of bacterial cells to form biofilms on abiotic surfaces and host tissues. The present review summarizes the literature data regarding extracellular and cell-associated virulence factors of S. maltophilia (some of which have still not been studied in detail) and considers the basic characteristics of biofilm formation. Many virulence features such as extracellular enzymes, bacterial motility and biofilm formation are finely controlled by quorum sensing (QS) that enable the bacteria to express these virulence factors in a coordinated, cell-density-dependent manner and overwhelm the host defence mechanisms. Manipulating the QS regulatory system is a promising approach for development of new strategies for control of S. maltophilia infections.
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