The bentonite flocculation test in the serology of tuberculosis. I. Purification of BCG antigens

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Abstract
Fractionation of unheated bacillary extract of BCG has yielded a carbohydrate fraction which sensitizes bentonite to react with circulating antibodies to M. tuberculosis in human sera. This fraction does not contain tuberculin-like protein material in appreciable amount, but is rather a mixture of carbohydrates, varying in molecular size and all possessing bentonite-sensitizing activity.