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Detection of infectious hematopoietic necrosis virus in river water and demonstration of waterborne transmission

January 1, 1983

In a study of the possible role of waterborne infectious haematopoietic necrosis virus in transmission of the disease among spawning sockeye salmon, Oncorhynchus nerka (Walbaum), both infection rates and virus titres were higher in fish held at high density in a side channel than in fish in the adjacent river. Virus was never isolated from river water, but was found in water from the side channel at levels ranging from 32.5 to 1600 plaque-forming units (p.f.u.)/ml. Uninfected yearling sockeye salmon held in a box in the side channel developed localized gill infections with IHN virus. The disease did not progress to the viscera until a threshold titre of about 105 p.f.u./g was reached in the gill. The effectiveness of the gill as a barrier limiting development of systemic infections means that waterborne IHN virus probably does not greatly increase the infection rate in a sockeye salmon population during spawning.

Citation Information

Publication Year 1983
Title Detection of infectious hematopoietic necrosis virus in river water and demonstration of waterborne transmission
DOI 10.1111/j.1365-2761.1983.tb00083.x
Authors Daniel M. Mulcahy, Ronald J. Pascho, C.K. Jenes
Publication Type Article
Publication Subtype Journal Article
Series Title Journal of Fish Diseases
Series Number
Index ID 70184255
Record Source USGS Publications Warehouse
USGS Organization Alaska Science Center