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When is the bacitracin test useful?

When is the bacitracin test useful?

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Bacitracin test is done to determine the susceptibility of bacteria to bacitracin drug. This drug is used to treat skin infection caused by gram positive bacteria in minor cuts and burns. This test is specifically used in presumptive diagnosis of Group A Streptococcus (GAS) especially Streptococcus pyogenes due to the susceptibility of this bacteria to bacitracin. So when the bacterial growth is inhibited due to the antibiotics effect of bacitracin, we can assume that the bacteria present is GAS.

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