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Electron microscopy analysis of structure changes in E. coli challenged baboon lung. a: normal architecture of the alveolar septae in healthy baboons; b. accumulation of neutrophils (PMN) and the presence of intra-alveolar bleeding erythrocytes (arrow) can be observed at 2 hrs; c: the increased accumulation of macrophages, fibroblasts and collagen deposition at 24 hrs. av, alveola; coll, collagen; Fb, fibroblasts; Mac, macrophages; RBC, red blood cells. Magnification: ×7000.
