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Comparison of linezolid activities under aerobic and anaerobic conditions against methicillin-resistant Staphylococcus aureus and vancomycin-resistant Enterococcus faecium. 2003

Brent W Gunderson, and Khalid H Ibrahim, and Charles A Peloquin, and Laurie B Hovde, and John C Rotschafer
Department of Experimental and Clinical Pharmacology, The University of Minnesota College of Pharmacy, Minneapolis, Minnesota 55455, USA.

Methicillin-resistant Staphylococcus aureus and vancomycin-resistant Enterococcus faecium were exposed to linezolid (MIC of 2 mg/liter) under aerobic or anaerobic conditions in an in vitro pharmacodynamic model. Drug concentration and half-life were adjusted to simulate clinical dosing (600 mg twice daily) of linezolid. Linezolid produced a 2-log(10) killing at 24 h, and rates of killing against each of these facultative organisms as measured by mean survival time appeared similar under aerobic and anaerobic conditions.

UI MeSH Term Description Entries
D008826 Microbial Sensitivity Tests Any tests that demonstrate the relative efficacy of different chemotherapeutic agents against specific microorganisms (i.e., bacteria, fungi, viruses). Bacterial Sensitivity Tests,Drug Sensitivity Assay, Microbial,Minimum Inhibitory Concentration,Antibacterial Susceptibility Breakpoint Determination,Antibiogram,Antimicrobial Susceptibility Breakpoint Determination,Bacterial Sensitivity Test,Breakpoint Determination, Antibacterial Susceptibility,Breakpoint Determination, Antimicrobial Susceptibility,Fungal Drug Sensitivity Tests,Fungus Drug Sensitivity Tests,Sensitivity Test, Bacterial,Sensitivity Tests, Bacterial,Test, Bacterial Sensitivity,Tests, Bacterial Sensitivity,Viral Drug Sensitivity Tests,Virus Drug Sensitivity Tests,Antibiograms,Concentration, Minimum Inhibitory,Concentrations, Minimum Inhibitory,Inhibitory Concentration, Minimum,Inhibitory Concentrations, Minimum,Microbial Sensitivity Test,Minimum Inhibitory Concentrations,Sensitivity Test, Microbial,Sensitivity Tests, Microbial,Test, Microbial Sensitivity,Tests, Microbial Sensitivity
D006207 Half-Life The time it takes for a substance (drug, radioactive nuclide, or other) to lose half of its pharmacologic, physiologic, or radiologic activity. Halflife,Half Life,Half-Lifes,Halflifes
D000069349 Linezolid An oxazolidinone and acetamide derived ANTI-BACTERIAL AGENT and PROTEIN SYNTHESIS INHIBITOR that is used in the treatment of GRAM-POSITIVE BACTERIAL INFECTIONS of the skin and respiratory tract. Linezolide,N-((3-(3-fluoro-4-morpholinylphenyl)-2-oxo-5-oxazolidinyl)methyl)acetamide,PNU-100766,U 100766,U-100766,Zyvox,100766, U,PNU 100766,PNU100766,U100766
D000081 Acetamides Derivatives of acetamide that are used as solvents, as mild irritants, and in organic synthesis.
D013211 Staphylococcus aureus Potentially pathogenic bacteria found in nasal membranes, skin, hair follicles, and perineum of warm-blooded animals. They may cause a wide range of infections and intoxications.
D015308 Anaerobic Threshold The oxygen consumption level above which aerobic energy production is supplemented by anaerobic mechanisms during exercise, resulting in a sustained increase in lactate concentration and metabolic acidosis. The anaerobic threshold is affected by factors that modify oxygen delivery to the tissues; it is low in patients with heart disease. Methods of measurement include direct measure of lactate concentration, direct measurement of bicarbonate concentration, and gas exchange measurements. Anaerobic Thresholds,Threshold, Anaerobic,Thresholds, Anaerobic
D016106 Methicillin Resistance Non-susceptibility of a microbe to the action of METHICILLIN, a semi-synthetic penicillin derivative. Methicillin-Resistant,Methicillin Resistant,Resistance, Methicillin
D016984 Enterococcus faecium A species of gram-positive, coccoid bacteria whose organisms are normal flora of the intestinal tract. Unlike ENTEROCOCCUS FAECALIS, this species may produce an alpha-hemolytic reaction on blood agar and is unable to utilize pyruvic acid as an energy source. Streptococcus faecium
D020713 Vancomycin Resistance Nonsusceptibility of bacteria to the action of VANCOMYCIN, an inhibitor of cell wall synthesis.
D023303 Oxazolidinones Derivatives of oxazolidin-2-one. They represent an important class of synthetic antibiotic agents. 1,3-Oxazolidin-2-one,Oxazolidin-2-one,Oxazolidinone,1,3-Oxazolidine-2-one,2-Oxazolidone,2-oxazolidinone,1,3 Oxazolidin 2 one,1,3 Oxazolidine 2 one,2 Oxazolidone,2 oxazolidinone,Oxazolidin 2 one

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