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Performance standards for antimicrobial susceptibility testing, ninth informational supplement

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The article was published on 2008-01-01 and is currently open access. It has received 1541 citations till now.

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Updated Functional Classification of β-Lactamases

TL;DR: The functional classification scheme updated herein is based on the 1995 proposal and includes group 1 (class C) cephalosporinases; group 2 (classes A and D) broad-spectrum, inhibitor-resistant, and extended-spectrums β-lactamases and serine carbapenemases; and group 3 metallo-β-lacticamases.
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Outcomes of carbapenem-resistant Klebsiella pneumoniae infection and the impact of antimicrobial and adjunctive therapies.

TL;DR: The mortality rate associated with carbapenem-resistant K. pneumoniae infection and the limited antimicrobial options for treatment of carbapnem- resistant K.neume infection highlight the need for improved detection and development of novel agents with reliable clinical efficacy against this type of infection.
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Prevalence in the United States of aac(6′)-Ib-cr Encoding a Ciprofloxacin-Modifying Enzyme

TL;DR: Aac(6′)-Ib-cr was geographically widespread, stable over time, most common in Escherichia coli, equally prevalent in ciprofloxacin-susceptible and -resistant strains, and not associated with qnr genes.
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Colistin Resistance in Acinetobacter baumannii Is Mediated by Complete Loss of Lipopolysaccharide Production

TL;DR: It is shown that A. baumannii can rapidly develop resistance to polymyxin antibiotics by complete loss of the initial binding target, the lipid A component of lipopolysaccharide (LPS), which has long been considered to be essential for the viability of Gram-negative bacteria.