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- W2154723735 abstract "CEM-101 had MIC ranges of 0.002 to 0.016 microg/ml against macrolide-susceptible pneumococci and 0.004 to 1 microg/ml against macrolide-resistant phenotypes. Only 3 strains with erm(B), with or without mef(A), had CEM-101 MICs of 1 microg/ml, and 218/221 strains had CEM-101 MICs of <or=0.5 microg/ml. CEM-101 MICs were as much as 4-fold lower than telithromycin MICs against all strains. For Streptococcus pyogenes, CEM-101 MICs ranged from 0.008 to 0.03 microg/ml against macrolide-susceptible strains and from 0.015 to 1 microg/ml against macrolide-resistant strains. Against erm(B) strains, erythromycin, azithromycin, and clarithromycin MICs were 32 to >64 microg/ml, while 17/19 strains had telithromycin MICs of 4 to 16 microg/ml; CEM-101 MICs were 0.015 to 1 microg/ml. By comparison, erm(A) and mef(A) strains had CEM-101 MICs of 0.015 to 0.5 microg/ml, clindamycin and telithromycin MICs of <or=1 microg/ml, and erythromycin, azithromycin, and clarithromycin MICs of 0.5 to >64 microg/ml. Pneumococcal multistep resistance studies showed that although CEM-101 yielded clones with higher MICs for all eight strains tested, seven of eight strains had clones with CEM-101 MICs that rose from 0.004 to 0.03 microg/ml (parental strains) to 0.06 to 0.5 microg/ml (resistant clones); for only one erm(B) mef(A) strain with a parental MIC of 1 microg/ml was there a resistant clone with a MIC of 32 microg/ml, with no detectable mutations in the L4, L22, or 23S rRNA sequence. Among two of five S. pyogenes strains tested, CEM-101 MICs rose from 0.03 to 0.25 microg/ml, and only for the one strain with erm(B) did CEM-101 MICs rise from 1 to 8 microg/ml, with no changes occurring in any macrolide resistance determinant. CEM-101 had low MICs as well as low potential for the selection of resistant mutants, independent of bacterial species or resistance phenotypes in pneumococci and S. pyogenes." @default.
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- W2154723735 date "2010-01-01" @default.
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- W2154723735 title "In Vitro Activity of CEM-101 against <i>Streptococcus pneumoniae</i> and <i>Streptococcus pyogenes</i> with Defined Macrolide Resistance Mechanisms" @default.
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- W2154723735 doi "https://doi.org/10.1128/aac.01123-09" @default.
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