The Research of The Transmission Routes of Koi Herpesvirus (KHV)
Date Issued
2007
Date
2007
Author(s)
Shih, Da
DOI
zh-TW
Abstract
Koi herpes virus (KHV), tentatively categorized under the family Herpesviridae as the novel designation Cyprinid herpesvirus 3 (CyHV-3), is an emerging virus which causes fatal disease in koi (Cyprinus carpio koi) and common carps (Cyprinus carpio carpio). In 1998 many carp and koi farms were found to be afflicted by KHV with a high mortality in Israel. Since then, the same disease has been identified in many carp farms in different countries. The rapid spread of the disease is suggested due to the intensive worldwide trade of koi, and Taiwan has been identified to be an infected zone since December 2002. Because of the high mortality, rapid spread, and deficiency of effective therapies, how to prevent and disrupt its transmission pathway becomes the most important thing now. In order to find the KHV transmission vectors in the field, we developed some cohabitation experiments to mimic the natural transmission of KHV in koi farms.
The commonly-found aquatic animals in koi farms involved in the cohabitation experiments include the goldfish, common goldfish, Chinese bull frog, mosquito fish, shrimp and snail. Our results revealed that the goldfish, common goldfish, Chinese bull frog and mosquito fish showed KHV positive by the PCR method after cohabiting three days with the KHV infected koi. Those KHV-positive creatures further cohabited with the normal koi, which were examined and proved to be KHV positive three days latter. However, the positive signal could only be found in goldfish visceral organs including kidney, spleen and intestine by in situ hybridization. Taken together, we concluded that the goldfish is the potential reservoir of KHV, and the common goldfish, Chinese bull frog and mosquito fish could just play a mechanical vector carrying the virus on their body surface.
Subjects
錦鯉
疱
疹病毒
錦鯉疱
傳播途徑
koi
koi herpesvirus
herpesvirus
CyHV-1
Type
thesis
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