Abstract
Dr. A. Mancini (Internal Medicine) Many different definitions for MDR, extensively drug-resistant (XDR) and PDR bacteria are being used in the medical literature [1]. According to an expert panel of a joint initiative by the European Centre for Disease Prevention and Control (ECDC) and the Centers for Disease Control and Prevention (CDC) definitions are the following: MDR organism is defined as acquired non-susceptibility to at least one agent in three or more antimicrobial categories; XDR to at least one agent in all, but two or fewer antimicrobial categories (i.e., bacterial isolates remain susceptible to only one or two categories); PDR organism is finally defined as non-susceptibility to all agents in all antimicrobial categories [2].
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