Porcine salmonellosis. I. Gross and microscopic changes in experimentally infected animals.

Renal vascular lesions associated with experimentally induced septicemic porcine salmonellosis consisted of fibrinoid necrosis of the vessel walls and fibrin thrombi within the lumina of interlobular arteries, afferent arterioles and glomerular capillary loops. Extrarenal vascular alterations were predominantly localized to the skin and the lungs. In these sites, too, mere fibrin thrombi were found in the capillaries, whereas mixed thrombi, consisting of fibrin, platelets, leucocytes and erythrocytes were present in larger vessels. The conclusion is drawn that the renal vascular injury is completely compatible to the generalized Shwartzman reaction, while the extrarenal vascular changes may only in part depend on this mechanism.