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Anemia, splenomegaly, and glomerulonephritis associated with autoantibody in Trypanosoma lewisi infections.

Anemia with splenomegaly and signs of glomerulonephritis were found associated with the acute and post-acute phase of Trypanosoma lewisi infections of laboratory rats. The onset of the anemia was associated with the peak of parasitemia and the development of cold-active hemagglutinin (HA) for trypsinized rat erythrocytes. It persisted with gradual recovery for as long as the trypanosomes and HA were detected in the blood. Signs of glomerulonephritis consisted of hypercellularity of the glomerular tuft, swelling of vascular endothelium and tubular epithelium, thickening of Bowman's membrane and tubular basement membrane, and abnormal numbers of hyaline casts in the distal convoluted tubules. Residual damage to the kidneys was not evaluated.