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  • Title: In vitro activity of dirithromycin (LY 237216) compared with activities of other macrolide antibiotics.
    Author: Yu KW, Neu HC.
    Journal: Antimicrob Agents Chemother; 1990 Sep; 34(9):1839-42. PubMed ID: 2126695.
    Abstract:
    Dirithromycin inhibited Streptococcus pyogenes, Streptococcus pneumoniae, and other hemolytic streptococci at concentrations of less than or equal to 0.03 to 0.12 micrograms/ml, with 90% inhibition at 0.12 micrograms/ml, which is comparable to results using erythromycin. Group A streptococci, listeriae, and enterococci resistant to erythromycin were resistant to dirithromycin. Erythromycin-susceptible staphylococci were inhibited by 0.5 micrograms/ml, but for erythromycin-resistant isolates MICs were greater than or equal to 8 micrograms/ml. For Haemophilus influenzae, MICs were greater than or equal to 8 micrograms/ml, two- to fourfold greater than for erythromycin. The activity of dirithromycin against staphylococci and streptococci was not decreased by the addition of human serum.
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