Bacitracin test



Bacitracin susceptibility test is used to differentiate β-hemolytic streptococci. It is possible to distinguish between Streptococcus pyogenes, which creates a zone of inhibition around the disc with bacitracin, and Streptococcus agalactiae, which grows up to the disc.

Results:
 * positive – Streptococcus pyogenes
 * negative – Streptococcus agalactiae

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