Synergism with Aminoglycosides of Penicillin, Ampicillin and Vancomycin Against Non-Enterococcal Group-D Streptococci and Viridans Streptococci
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چکیده
منابع مشابه
Tolerance to penicillin in streptococci of viridans group.
Tolerance to penicillin was investigated in 40 isolates of optochin-resistant, alpha-haemolytic streptococci. Thirteen strains exhibited tolerance to penicillin (MBC:MIC ratio greater than or equal to 32) when stationary phase inocula were used, but only seven strains retained the tolerance phenotype in experiments with logarithmic phase inocula. There was a striking association between toleran...
متن کاملIn vitro activities of 22 beta-lactam antibiotics against penicillin-resistant and penicillin-susceptible viridans group streptococci isolated from blood.
A total of 410 strains of viridans group streptococci isolated consecutively from blood were tested by the microdilution method for in vitro susceptibility to 22 beta-lactam antibiotics. One hundred thirty-eight strains (33.6%) were resistant to penicillin with a MIC range of 0.25 to 8 micrograms/ml. MICs of all beta-lactam agents tested were higher for penicillin-resistant strains than for sus...
متن کاملComparative activity of ampicillin and seven cephalosporins against group D streptococci.
Minimum inhibitory concentrations have been determined for ampicillin and seven cephalosporins against 93 strains of group D streptococci isolated recently from clinical material. Ampicillin was much the most active compound (modal MIC = 1.6 mug/ml); cephaloridine, cephacetrile, and cefazolin had a modal MIC of 25 mug/ml, while corresponding figures for cephalothin, cephradine, cephalexin, and ...
متن کاملMannosidase production by viridans group streptococci.
The production of mannosidase activity by all currently recognized species of human viridans group streptococci was determined using an assay in which bacterial growth was dependent on the degradation of the high-mannose-type glycans of RNase B and subsequent utilization of released mannose. RNase B is an excellent substrate for the demonstration of mannosidase activity since it is a glycoprote...
متن کاملPenicillin-resistant and penicillin-tolerant mutants of group A Streptococci.
Penicillin-resistant and penicillin-tolerant mutants have been isolated from group A streptococci mutagenized by ethyl methane sulfonate. The resistant mutants had an elevated minimal growth inhibitory concentration for benzylpenicillin (minimal inhibitory concentration, 0.2 microgram/ml, as compared with the minimal inhibitory concentration of 0.006 microgram/ml in the penicillin-susceptible p...
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ژورنال
عنوان ژورنال: Journal of Medical Microbiology
سال: 1977
ISSN: 0022-2615,1473-5644
DOI: 10.1099/00222615-10-1-133