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Abstract
Se indica la técnica seguida para aislamiento y conservación de estreptococos beta-hemoliticos a partir de enfermos con amigdalitis. También se especifican las pruebas realizadas, tanto bioquímicas como serológicas, para la identificación de las 59 cepas aisladas, encontrándose 48 pertenecientes al grupo A de Lancefield, 4 al grupo F, ninguna al G y 7 no se identifican por carecer de los antisueros específicos. La lactosa es fermentada por todas las cepas. El test de la bacitracina positivo no es concluyente para afirmar que un estreptococo beta-hemolitico pertenece al grupo A de Lancefield. Por último la reacción de inmunofluorescencia ha sido solo positiva para las cepas del grupo A.
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