Infectious haematopoietic necrosis IHN is an infectious disease of rainbow or steelhead trout Oncorhynchus mykiss, Pacific salmon including chinook O. tshawytscha, sockeye O. nerka, chum O. keta, yamame O. masou, amago O. rhodurus, and coho O. kisutch and Atlantic salmon Salmo salar. The most prominent environmental factor affecting IHN is water temperature. Clinical disease occurs between 8oC and 15oC under natural conditions. High levels of virus are shed from infected juvenile fish. Older fish are increasingly resistant to infection, but adult fish at spawning may shed virus in sexual products.

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