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Definition of Johnin
1. Noun. A preparation made from ''Mycobacterium paratuberculosis '' used as an allergen in cases of paratuberculosis (Johne's disease) ¹
¹ Source: wiktionary.com
Medical Definition of Johnin
1. A product used as a diagnostic agent, analogous to tuberculin but made from Mycobacterium paratuberculosis (the causative organism of Johne's disease) grown in a broth medium containing Mycobacterium phlei (timothy hay bacillus); used as an allergen to provoke reactions in infected animals. Origin: H. A. Johne (05 Mar 2000)