Susceptibility of Skin and Throat Strains of Group A Streptococci to Rosamicin and Erythromycin

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Abstract
The minimal inhibitory concentrations of rosamicin and erythromycin were compared for 210 strains of group A streptococcus isolated from a diverse spectrum of streptococcal diseases. Of these strains, 97.6% were inhibited by 0.1 to 0.2 μg of rosamicin per ml, whereas 90.9% were inhibited by 0.025 to 0.05 μg of erythromycin per ml. The minimal inhibitory concentration of rosamicin for 154 strains exceeded that of erythromycin by at least fourfold. Five group A strains of streptococcus that were highly resistant to erythromycin were even more resistant to rosamicin.