Abstract
Abstract Adult sockeye salmon Oncorhynchus nerka, captured as they exited saltwater during their spawning migration and subsequently held in pathogen-free water until sexual maturation, were assayed for the presence of infectious hematopoietic necrosis virus (IHNV). The virus was not isolated from any of the test fish. Sockeye salmon allowed to migrate naturally to spawning grounds on the Cedar River, Washington, had IHNV prevalences of 90 to 100%. Our data suggest that the high prevalence if IHNV in the natural spawners is primarily the result of horizontal virus transmission in the Cedar River and not of the reappearance of virus in fish harboring a life-long latent infection.
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