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. 2022 Nov 23;9:922961. doi: 10.3389/fvets.2022.922961

Figure 2.

Figure 2

Microscopic lesions associated with the yersiniosis epizootic, vervets, multiple organs. (A) Colitis, colon, case 3. The colonic wall is transmurally necrotic and expanded by inflammatory cells. Large colonies of bacilli extend into lymphatic vessels and the adjacent mesentery. HE. (B) Colon, case 3. Large colonies of bacilli are present in the mesentery. Inset: A colony of Gram-negative bacilli within the necrotic debris. Gram histochemical stain. (C) Lymphadenitis, mesenteric lymph node, case 18. Large bacterial colonies and necrotic debris efface the normal lymph node architecture. HE. (D) Splenitis, spleen, case 5. Colonies of 1x5 μm bacilli largely obliterate the red pulp. (E) Hepatitis, liver, case 19. A well-demarcated abscess effaces the parenchyma. HE. (F) Pneumonia, lung, case 1. The lung architecture is extensively obscured by adjoining regions of bacteria, inflammation, and necrosis. HE. (G) Osteomyelitis, femur, case 18. Large colonies of bacteria, degenerate neutrophils, and cellular debris surround a fragment of necrotic bone in the medullary cavity. HE. (H) Placentitis, placenta, case 20. Bacteria and neutrophils infiltrate the decidua and maternal sinusoids. HE.