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  • Title: Argentinian collaborative study on prevalence of erythromycin and penicillin susceptibility in Streptococcus pyogenes. The Argentinian Streptococcus Study Group.
    Author: Lopardo HA, Venuta ME, Vidal P, Rosaenz L, Corthey C, Farinati A, Couto E, Sarachian B, Sparo M, Kaufman S, De Mier CA, Gubbay L, Scilingo V, Villaverde P.
    Journal: Diagn Microbiol Infect Dis; 1997 Sep; 29(1):29-32. PubMed ID: 9350412.
    Abstract:
    Two monthly studies on the prevalence of penicillin and erythromycin susceptibility of Streptococcus pyogenes were performed in May and October of 1994 in Argentina. A total of 58 centers from 27 cities participated in these studies. A total of 1072 isolates were tested by a diffusion method, although 595 isolates were tested both by the diffusion and an agar dilution method (n = 1767 isolates). No penicillin-resistant streptococci were found in our study (MIC100 = 0.03 microgram/ml). Only four isolates were confirmed as erythromycin resistant S. pyogenes (prevalence 0.14 and 0.28% in May and October 1994, respectively). Resistance in three isolates was due to an inducible mechanism, although in one strain a different phenotype was observed.
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