Bacitracin Susceptibility Test



The Bacitracin test is used to distinguish β-hemolytic streptococci. It can distinguish between Streptococcus pyogenes, which forms a zone of inhibition around the bacitracin disc, and Streptococcus agalactiae, which grows up to the disc.

Results:
 * Positive – Streptococcus pyogenes
 * Negative – Streptococcus agalactiae

Related articles

 * CAMP test
 * Catalase test
 * Plasmacoagulase test
 * Optochin test