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Results for “minimum inhibitory concentration”

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At least 145 records · Page 8Linked to original sources
PubMed1999

Tentative minimum inhibitory concentration and zone diameter breakpoints for moxifloxacin using BSAC criteria.

Tentative MIC and zone diameter breakpoints were determined for moxifloxacin using BSAC criteria. An MIC breakpoint of < or =1 mg/L, denoting sensitivity, is suggested for Enterobacteriaceae, staphylococci, haemophili, moraxellae, pneumococci and enterococci. For pseudomonads high and low breakpoints of 4 mg/L and 1 mg/L are suggested to allow for an intermediate category of sensitivity. A 1 microg moxifloxacin disc content is suggested for testing all of the organisms previously mentioned, except pseudomonads, for which a 5 microg disc is needed to discriminate between the intermediate and sensitive populations. Corresponding zone diameter breakpoints for a 1 microg disc are > or = 20 mm for Enterobacteriaceae and staphylococci, 18 mm for the respiratory pathogens (Streptococcus pneumoniae, Haemophilus influenzae and Moraxella catarrhalis) and 15 mm for enterococci. For Pseudomonas aeruginosa with a 5 microg disc, three bands are suggested for interpretation, that of > or = 25 mm (sensitive), 18-24 mm (intermediate) and < or = 17 mm (resistant).

Anti-Infective Agents↗
PubMed1993

Sub-minimum inhibitory concentrations of ceftibuten reduce adherence of Escherichia coli to human cells and induces formation of long filaments.

The minimal inhibitory concentrations (MICs) of an antibiotic are present for only a certain period of time, after which they become sub-inhibitory concentrations (sub-MICs). These sub-MICs are still active because they can interfere with the mechanism of bacterial adhesion, which is the first step in the sequence of events leading to infection. The purpose of the present study was to investigate the effects of sub-MICs of ceftibuten, a new third-generation cephalosporin, on the adhesion of Escherichia coli (E. coli) to human buccal cells. The degree of inhibition was maximal at 1/2 MIC and then gradually returned toward to the control values at 1/128 the MIC. The differences were statistically significant from 1/2 to 1/32 MIC. Since the MIC was 0.5 micrograms/ml, concentrations from 0.25 to 0.015 micrograms/ml significantly reduce bacterial adhesion. Ceftibuten also caused marked elongation of E. coli. These findings could help to explain the efficacy showed by ceftibuten in the treatment of respiratory and urinary tract infections when administered once daily.

Bacterial Adhesion↗
PubMed2004

Minimum inhibitory concentrations for 25 selected antimicrobial agents against Dichelobacter nodosus and Fusobacterium strains isolated from footrot in sheep of Portugal and Spain.

The agar dilution method was used to determine the inhibitory activity of 25 antimicrobial agents against 69 strains of Dichelobacter nodosus and 108 strains of the genus Fusobacterium, all of which were isolated from 90 clinical cases of ovine footrot between October 1998 and November 2000. In the case of the micro-organisms belonging to the genus Fusobacterium, the six beta-lactams studied (benzyl penicillin, ampicillin, cloxacillin, cefadroxil, cefuroxime and cephalexine) proved to be, in general, the most effective antimicrobial agents. Chloramphenicol, clindamycin and doxycycline were also quite active against Fusobacterium spp. With regard to the 69 strains of D. nodosus tested, the levels of resistance remain low.

Animals↗
PubMed1977

Rapid method for determining the minimum inhibitory concentration of ampicillin for Haemophilus influenzae.

A rapid method for determining the minimal inhibition concentrations (MICs) of ampicillin using Haemophilus influenzae as the test organism is described. This semiautomated technique using the Autobac system was compared with the agar dilution MIC method. Fifty-seven isolates of both susceptible and resistant H. influenzae were tested. There was exact quantitative agreement with 65% of the isolates, and 91% of the isolates showed no more than a one-dilution-interval difference when MICs were determined by both methods. Total testing time was 3 to 4 h.

Ampicillin↗
PubMed1979

Broth dilution minimum inhibitory concentrations: rationale for use of selected antimicrobial concentrations.

A microdilution susceptibility testing procedure utilizing selected, clinically relevant concentrations of a large number of antimicrobial agents is described. A qualitative code designed to facilitate interpretation of quantitative results is coupled with each antimicrobial concentration. Both the antimicrobial concentrations selected for testing and the assigned codes are based on published data regardling attainable antimicrobial levels in serum and urine.

Anti-Bacterial Agents↗
PubMed1996

Minimum inhibitory concentration breakpoints and disk diffusion inhibitory zone interpretive criteria for tilmicosin susceptibility testing against Pasteurella spp. associated with bovine respiratory disease.

Tilmicosin is a novel macrolide antibiotic developed for exclusive use in veterinary medicine. The first tilmicosin-containing product was approved to treat bovine respiratory disease associated with pasteurellae. The development of antimicrobial susceptibility testing guidelines for tilmicosin was predicated on the relationship of clinical efficacy studies that demonstrated a favorable therapeutic outcome, on pharmaco-kinetic data, and on in vitro test data, as recommended by the National Committee for Clinical Laboratory Standards (NCCLS). The NCCLS-approved breakpoints for the MIC dilution testing are resistant > or = 32 micrograms/ml, intermediate 16 micrograms/ml, and susceptible < or = 8 micrograms/ml. The zone of inhibition interpretive criteria for disk diffusion testing with a 15-micrograms disk are resistant < or = 10 mm, intermediate 11-13 mm, and susceptible > or = 14 mm.

Animals↗