CD209 and Crohn disease: Although bovine PTB is widely accepted to be a multigenically regulated infectious disease [16–21, 35], in a similar manner as it is presupposed to occur in its human multifactorial inflammatory bowel disorder counterpart—Crohn disease—[36] and in accordance with what is assumed for the pathogenesis of the major pathogenic mycobacterial agent in humans (Mycobacterium tuberculosis), only one genetic association between latent PTB and CD209 gene was confirmed (Table 2).