Tuberculin

Tuberculin is the name given to extracts of Mycobacterium tuberculosis, M. bovis, or M. avium that is used in skin testing in animals and humans to identify a tuberculosis infection. Several types of tuberculin have been used for this, of which purified protein derivative (PPD) is the most important. PPD is a poorly-defined, complex mixture of antigens. Tests based upon PPD are relatively unspecific since many of its proteins are found in different mycobacterial species.

Tuberculin is an outer membrane protein of Mycobacterium species.

Read more about TuberculinDevelopment History, The Tuberculin Scandal, Modern Testing For Tuberculosis

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... Tuberculin conversion is said to occur if a patient who has previously had a negative tuberculin skin test develops a positive tuberculin skin test at a later date ...
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... The test used in the United States at present is referred to as the Mantoux test ... An alternative test called the Heaf test was used in the United Kingdom until 2005, although the UK now uses the Mantoux test in line with the rest of the world ...