American Type Culture Collection (ATCC) strain 19698 is here proposed as the neotype strain of Bergey et al. 1923. No culture of any of the strains on which the original description of this organism was based is known to be extant. A working type, ATCC 12227, is used for vaccine and paratuberculin production, but this strain is atypical of the species in that it lacks most of the distinctive properties of the species, including mycobactin requirement and pathogenicity. ATCC 19698 possesses the characters given in the original description of as well as those of the current concept of this species.


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