Erythrocytic inclusions in the blood of spring chinook salmon (Oncorhynchus tshawytscha) are the first confirmed occurrence of a natural infection caused by an erythrocytic necrosis virus in a population being reared in freshwater. The erythrocytic inclusion bodies ranged in size from 0.8 to 3 μm. Pinacyanol chloride stained the inclusions a pale purple. The viral particle size averaged 75 nm in diameter, and they were scattered randomly in the cytoplasm.
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Steve L. Leek (1987) studied this question.