The incidence, staining qualities, organ distribution, age of affected individuals, and disease conditions associated with avian amyloidosis occurring in a population of 1698 zoo birds were analysed. Amyloid disease occurs in older birds, predominantly affecting the liver, spleen, and adrenals. The staining qualities and morphology are very similar to mammalian amyloid. The disease occurs mainly in exotic or poorly adapted birds, apparently related to environmental factors rather than to any specific predisposing disease.
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