1887

Abstract

Koi herpesvirus (KHV) has been associated with devastating losses of common carp () and koi () in North America, Europe, Israel and Asia. A comparison of virion polypeptides and genomic restriction fragments of seven geographically diverse isolates of KHV indicated that with one exception they represented a homogeneous group. A principal environmental factor influencing the onset and severity of disease is water temperature. Optimal growth of KHV in a koi fin cell line occurred at temperatures from 15–25 °C. There was no growth or minimal growth at 4, 10, 30 or 37 °C. Experimental infections of koi with KHV at a water temperature of 23 °C resulted in a cumulative mortality of 95·2 %. Disease progressed rapidly but with lower mortality (89·4–95·2 %) at 28 °C. Mortality (85·0 %) also occurred at 18 °C but not at 13 °C. Shifting virus-exposed fish from 13–23 °C resulted in the rapid onset of mortality.

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2003-10-01
2020-10-27
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