Burkholderia comprises species that are significant biothreat agents and common contaminants of pharmaceutical production facilities. Their extreme antibiotic resistance affects all classes of antibiotics, including polycationic polymyxins and aminoglycosides. The major underlying mechanism is the presence of two permeability barriers, the outer membrane with modified lipid A moieties and active drug efflux pumps.
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Krishnamoorthy et al. (2019) studied this question.
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