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Comparison of in vitro Growth Characteristics of Ten Isolates of Infectious Haematopoietic Necrosis Virus

United States Fish and Wildlife Service, National Fishery Research Center, Building 204, Naval Station, Seattle, Washington 98115, U.S.A.

Ten isolates of infectious haematopoietic necrosis from salmonid fishes of different locations on the West Coast of North America from California to Alaska were compared by plaque size, single-step growth curves at 15 and 18 °C, rate of appearance of cytopathic effects in cell cultures, and growth over a range of temperatures. All isolates were distinguishable on the basis of each growth characteristic examined. The CO isolate from the Sacramento River drainage of California was the most singular of the 10 because of its diminutive plaque size and sensitivity to slightly elevated temperatures. The mean plaque diameter of the 10 isolates increased as the latitude of the geographic source of the isolate increased. Although the maximum titre obtained by all isolates was depressed at temperatures above approximately 18 °C, half of the isolates were not inhibited by temperatures as low as 0.5 °C.

Keywords: fish virus, IHN virus, salmonid fish diseases

Received 11 April 1984; accepted 16 August 1984.

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