When using the latex agglutination test (plasmatec) for streptococcal grouping, sometimes for a single isolate I am getting two or three groups. The Biomerieux grouping kit is very costly. What else can be done for the specific identification of Group A streptococci other than phenotypic tests like bacitracin sensitivity and PYR tests? In order to run a PCR specific for Streptococcus pyogenes, which primer sequences should I use?

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