Medical Definition of old tuberculin
: tuberculin prepared by boiling, filtering, and concentrating a broth culture of tubercle bacilli and originally introduced as a proposed curative agent for tuberculosis but now used in skin tests to detect tubercular infection
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“Old tuberculin.” Merriam-Webster.com Medical Dictionary, Merriam-Webster, https://www.merriam-webster.com/medical/old%20tuberculin. Accessed 25 Jun. 2022.
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