Abstract
Severe combined immunodeficient beige mice were inoculated orally and intraperitoneally with a bovine strain of Mycobacterium paratuberculosis to explore their potential as laboratory animal models in the study of paratuberculosis (Johne's disease). Control animals were similarly inoculated with heat-killed M. paratuberculosis. In the mice inoculated intraperitoneally, focal lesions and acid-fast bacilli were first detected in the livers (4 weeks postinfection) and later in the spleens and intestines of the test but not the control animals. No bacteria were seen in the hearts, kidneys, or lungs. At 12 weeks postinfection, all test mice had significant losses in body weight compared with those in controls (P less than 0.05), a characteristic sign of bovine paratuberculosis. Tumor necrosis factor alpha was not detected in the serum. Histologic lesions were seen in the intestines, livers, and spleens of the animals in the orally inoculated test group after 26 weeks of infection. Our results suggest that the severe combined immunodeficient beige mouse may be a useful model for the investigation of paratuberculosis and cachexia and the evaluation of antimycobacterial drugs.
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