Figures 1–4.

Lesions caused by spontaneous infection of alpacas by Streptococcus equi subspecies zooepidemicus.

Figure 1. Fibrinous peritonitis (arrow) in mildly icteric carcass of case 2.

Figure 2. Fibrinosuppurative pleuritis in case 2. H&E. Insert: myriad gram-positive cocci in the pleura. Gram stain.

Figure 3. Diffuse congestion, alveolar edema, hemorrhage, and colonies of cocci in the lung in case 2. H&E. Insert: colonies of gram-positive cocci in alveolar space and interstitium. Gram stain.

Figure 4. Small intestinal transmural pleocellular enteritis, including submucosal and serosal edema, hemorrhages, and mesenteric thrombi with cocci in blood and lymphatic vessels (asterisks) in case 1.