Antimicrobial susceptibility testing of Streptococcus pneumoniae by micro-broth dilution.

  title={Antimicrobial susceptibility testing of Streptococcus pneumoniae by micro-broth dilution.},
  author={Martha M. Tarpay and David F. Welch and Melvin I. Marks},
  journal={Antimicrobial agents and chemotherapy},
  volume={18 4},
Thirty-three clinical isolates of Streptococcus pneumoniae were tested for susceptibility to penicillin and ampicillin by a standard agar dilution method. Results were compared to those obtained using a micro-broth dilution technique in which Mueller-Hinton broth was supplemented with 5% difibrinated whole sheep blood. Among the 33 strains, 2 were resistant (minimal inhibitory concentration, 8 micrograms/ml), 10 were relatively resistant (minimal inhibitory concentration, 0.12 to 0.5 micrograms… CONTINUE READING

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