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A fatty body extracted from a culture of Streptothrix leproides by Deycke and Reschad Bey, which it is claimed will produce in conjunction with benzoyl chloride an active immunity against the lepra bacillus and other acid-fast bacilli, including the tubercle bacillus.

A fatty substance from cultures of the streptothrix of leprosy; said to produce active immunity against leprosy. [Gr.]