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tuberculin (too-burīku-lin)   a sterile liquid containing the growth products of, or specific substances extracted from, the tubercle bacillus; used in various forms in the diagnosis of tuberculosis. See tuberculin test.
 

Old tuberculin  a sterile solution of a heat-concentrated filtrate of tubercle bacillus culture grown on a special medium, used for tuberculin tests.

PPD tuberculin  , purified protein derivative tuberculin  a sterile solution of a purified protein fraction precipitated from a filtrate of tubercle bacillus culture grown on a special medium, used for tuberculin tests.





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