antimicrobial susceptibility and survey of macrolide resistance mechanisms among streptococcus pyogenes isolated in rio de janeiro, brazil. | a total of 357 clinical streptococcus pyogenes isolates collected between 1994 and 1999 in rio de janeiro city were tested for susceptibility to 10 antimicrobial drugs by agar-diffusion tests. all isolates were susceptible to penicillin, cephems, and vancomycin. high resistance rates were observed for tetracycline (43.1%) and trimethoprim/sulfamethoxazole (77.9%). three isolates (0.8%) were resistant to erythromycin, and three exhibited intermediate susceptibility. determination of the erythromy ... | 2003 | 12705687 |