old tuberculin

old tuberculin
old tuberculin n tuberculin prepared by boiling, filtering, and concentrating a broth culture of tubercle bacilli and orig. introduced as a proposed curative agent for tuberculosis but now used in skin tests to detect tubercular infection

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(OT) [USP] a form of tuberculin prepared as a culture filtrate adjusted to a standard potency by addition of glycerin and isotonic sodium chloride solution; used for tuberculin tests. Called also Koch t.

Medical dictionary. 2011.

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