This represents a fibrinous and neutrophilic enteritis overlying peyer's patches of the ileum, a lesion attributable to Salmonella typhimurium infection. This is the histologic appearance of the intestine in Figure 13. The arrowheads indicate the surface of the intestinal mucosa at the site of an intestinal ulcer. Everything above the arrowheads consists of fibrin and dead neutrophils. This is the normal response to Salmonella infection of the intestine.
Arrowheads indicate the surface of the mucosa.
Compare this to Figure 14 and notice the absence of cells in the fibrin layer overlying the ulcer. LAD This is a high magnification of a submucosal vessel beneath the diseased intestinal mucosa. Notice the numerous dark staining neutrophils in the vessel. Thus, the degree of inflammation in the tissues is inappropriately low for the degree of bacterial colonization and tissue destruction. The nasal discharge of this foal suggests that is has bronchopneumonia, or an airway-associated inflammation of the lungs.