The regulation of the intestinal epithelium and host-pathogen interactions by the constitutive androstane receptor

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Johne’s disease, a wasting condition in ruminants, is caused by infection with Mycobacterium avium subspecies paratuberculosis (MAP), which is transmitted via contaminated milk and through the fecal-oral route. Since signs and symptoms of Johne’s disease often take years to develop (during which MAP can be shed in the feces), it is difficult to implement traditional surveillance methods to reduce its spread. To limit the burden of infectious disease in livestock and natural ruminants we must understand the steps that lead to pathogen transmission, invasion and the host inflammatory response.