These microorganisms employ several mechanisms in attaining multi-drug resistance: No longer relying on a glycoprotein cell wall Enzymatic deactivation of antibiotics Decreased cell wall permeability to antibiotics Altered target sites of antibiotic Efflux mechanisms to remove antibiotics Increased mutation rate as a stress response Many different bacteria now exhibit multi-drug resistance, including staphylococci, enterococci, gonococci, streptococci, salmonella, as well as numerous other Gram-negative bacteria and Mycobacterium tuberculosis.
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