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Is differentiation by Taxo A disc a confirmatory test for Group A Strep?

April 26, 2017confirmatory differentiation Disc group strep Test

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Is differentiation by Taxo A disc a confirmatory test for Group A Strep?

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No. The Taxo A disc is approximately 65% accurate. Organisms other than Group A Strep may exhibit bacitracin sensitivity (6% of group B and 7.5% of groups C & G streptococci may produce zones of inhibition/false positive result). A confirmatory test for Group A Strep is required.