A product used as a diagnostic agent, analogous to tuberculin but made from Mycobacterium paratuberculosis (the causative organism of Johne disease) grown in a broth medium containing Mycobacterium phlei (timothy hay bacillus); used as an allergen to provoke reactions in infected animals.
[H. A. Johne]


H. Albert, German physician, 1839-1910.
Johne bacillus - a species causing Johne disease, a chronic enteritis in cattle. Synonym(s): Mycobacterium paratuberculosis
Johne disease - a disease occurring in cattle and sheep, caused by infection with Mycobacterium paratuberculosis. Synonym(s): chronic dysentery of cattle; paratuberculosis
johnin - a diagnostic agent, analogous to tuberculin.


an extract of the culture of Mycobacteriumavium subspecies paratuberculosis used in a cutaneous delayed hypersensitivity test for Johne's disease. A positive test is a thickening and edema at the site of injection 48 hours later.
References in periodicals archive ?
Comparison of IS900 tissue PCR, bacterial culture, johnin and serological tests for diagnosis of naturally occurring Paratuberculosis in goats.
The intradermal Johnin test and interferon gamma assays (IFN-a) (Wood et al, 1991, Rothel et al.
Johnin K, Nakatoh M, Kadowaki T, Kushima M, Koizumi S, Okada Y.
Johnin, fecal microscopy, fecal culture, PCR (fecal and blood) and antibody assays (ELISA and IFN-[gamma]) are available however, no single test can precisely diagnose all cases with absolute accuracy (Tiwari et al.
Johnin K, Kushima S, Okada Y: Percutaneous Transvesical retraction of foreign body penetrating the urethra, J.
Specificity of two tests for the early diagnosis of bovine paratuberculosis based on cell-mediated immunity: the Johnin skin test and the gamma interferon assay.
When the Birmingham Mailmet Johnin the summer he did admit to one worry about visiting Birmingham this festive season as he could not find a hotel where he could also lodge his three beloved dogs - Charlie, CJ and Harris.
For many years I have joined Johnin his quest for good real ale, and bargain recordings in charity shops - a characteristic perhaps the only omission in George Odam's charming compilation Landscapes of the Mind: The Music of John McCabe, an attractive evocation of this attractive man in his 70th year (Ashgate pounds 35).
Johnin skin test, ELISA (PARACHEK[R] kit) and Faecal ZN staining were used for testing for Johne's disease.
Para TB Ab Mono Indirect, Synbiotics Johnin ELISA Kit, Cat No.
Hawkes, Johnin full John Clendennin Burne Hawkes, Jr.