Journal of Antimicrobial Chemotherapy (2001) 48, 5-16
© 2001 The British Society for Antimicrobial Chemotherapy
Supplement |
Determination of minimum inhibitory concentrations
1 Department of Microbiology, City Hospital NHS Trust, Birmingham B18 7QH, UK
Abstract
Minimum inhibitory concentrations (MICs) are defined as the lowest concentration of an antimicrobial that will inhibit the visible growth of a microorganism after overnight incubation, and minimum bactericidal concentrations (MBCs) as the lowest concentration of antimicrobial that will prevent the growth of an organism after subculture on to antibiotic-free media. MICs are used by diagnostic laboratories mainly to confirm resistance, but most often as a research tool to determine the in vitro activity of new antimicrobials, and data from such studies have been used to determine MIC breakpoints. MBC determinations are undertaken less frequently and their major use has been reserved for isolates from the blood of patients with endocarditis. Standardized methods for determining MICs and MBCs are described in this paper. Like all standardized procedures, the method must be adhered to and may not be adapted by the user. The method gives information on the storage of standard antibiotic powder, preparation of stock antibiotic solutions, media, preparation of inocula, incubation conditions, and reading and interpretation of results. Tables giving expected MIC ranges for control NCTC and ATCC strains are also supplied.
Notes
* Tel: +44-121-507-5693; Fax: +44-121-551-7763; E-mail: Jenny.Andrews{at}cityhospbham.wmids.nhs.uk
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F. Walsh, F. Carnegy, J. Willcock, and S. Amyes Comparative in vitro activity of telithromycin against macrolide-resistant and -susceptible Streptococcus pneumoniae, Moraxella catarrhalis and Haemophilus influenzae J. Antimicrob. Chemother., May 1, 2004; 53(5): 793 - 796. [Abstract] [Full Text] [PDF] |
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D. J. Eaves, V. Ricci, and L. J. V. Piddock Expression of acrB, acrF, acrD, marA, and soxS in Salmonella enterica Serovar Typhimurium: Role in Multiple Antibiotic Resistance Antimicrob. Agents Chemother., April 1, 2004; 48(4): 1145 - 1150. [Abstract] [Full Text] [PDF] |
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V. Ricci, M. L. Peterson, J. C. Rotschafer, H. Wexler, and L. J. V. Piddock Role of Topoisomerase Mutations and Efflux in Fluoroquinolone Resistance of Bacteroides fragilis Clinical Isolates and Laboratory Mutants Antimicrob. Agents Chemother., April 1, 2004; 48(4): 1344 - 1346. [Abstract] [Full Text] [PDF] |
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N. A. C. Potz, M. Colman, M. Warner, R. Reynolds, and D. M. Livermore False-positive extended-spectrum {beta}-lactamase tests for Klebsiella oxytoca strains hyperproducing K1 {beta}-lactamase J. Antimicrob. Chemother., March 1, 2004; 53(3): 545 - 547. [Full Text] [PDF] |
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R. Reynolds, J. Shackcloth, D. Felmingham, A. MacGowan, and on behalf of the BSAC Extended Working Party on Re Comparison of BSAC agar dilution and NCCLS broth microdilution MIC methods for in vitro susceptibility testing of Streptococcus pneumoniae, Haemophilus influenzae and Moraxella catarrhalis: the BSAC Respiratory Resistance Surveillance Programme J. Antimicrob. Chemother., December 1, 2003; 52(6): 925 - 930. [Abstract] [Full Text] [PDF] |
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R. Reynolds, J. Shackcloth, D. Felmingham, A. MacGowan, and on behalf of the BSAC Extended Working Party on Re Antimicrobial susceptibility of lower respiratory tract pathogens in Great Britain and Ireland 1999-2001 related to demographic and geographical factors: the BSAC Respiratory Resistance Surveillance Programme J. Antimicrob. Chemother., December 1, 2003; 52(6): 931 - 943. [Abstract] [Full Text] [PDF] |
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N. Woodford, R. Reynolds, J. Turton, F. Scott, A. Sinclair, A. Williams, and D. Livermore Two widely disseminated strains of Enterococcus faecalis highly resistant to gentamicin and ciprofloxacin from bacteraemias in the UK and Ireland J. Antimicrob. Chemother., October 1, 2003; 52(4): 711 - 714. [Abstract] [Full Text] [PDF] |
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