The Use of Bacitracin for Identifying Group A Haemolytic Streptococci

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Abstract
Only 1.7% of bacitracin-sensitive strains proved not to be Group A, and only 2.5% of resistant strains were Group A. Sterile, dried filter paper disks previously soaked in bacitracin in glycine-phosphate buffer or a commercial sample of bacitracin (Pfizer), 5 U. per ml., were placed on subcultured colonies in blood agar plate and incubated for the definitive testing.