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| Drug Resistance, Microbial Antibiotic Resistance, Microbial | Antimicrobial Drug Resistance | Antimicrobial Drug Resistances | Drug Resistances, Microbial The ability of microorganisms, especially bacteria, to resist or to become tolerant to chemotherapeutic agents, antimicrobial agents, or antibiotics. This resistance may be acquired through gene mutation or foreign DNA in transmissible plasmids (R FACTORS). |