Bacitracin test

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Negative bacitracin test without a zone of inhibition

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

Links

Related articles

• CAMP test
• Catalase test
• Plasmacoagulase test
• Optochin test

Bibliography

• ŠMÍROVÁ, Václava. Úvod do lékařské mikrobiologie. - edition. -. 

• BEDNÁŘ, Marek – SOUČEK, Andrej – FRAŇKOVÁ, Věra. Lékařská mikrobiologie : Bakteriologie, virologie, parazitologie. 1. edition. Praha : Marvil, 1996. 558 pp. ISBN 8023802976.