: a sterile solution of the growth products of Johne's bacillus made in the same manner as tuberculin and used to identify Johne's disease by skin tests, conjunctival reactions, or intravenous injection
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“Johnin.” Merriam-Webster.com Medical Dictionary, Merriam-Webster, https://www.merriam-webster.com/medical/johnin. Accessed 2 Dec. 2025.
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