Bioassay evidence for the transmission of WSSV by the harpacticoid copepod Nitocra sp.
文献类型: 外文期刊
第一作者: Zhang, Jia-Song
作者: Zhang, Jia-Song;Dong, Shuang-Lin;Dong, Yun-Wei;Tian, Xiang-Li;Hou, Chun-Qiang;Zhang, Jia-Song
作者机构:
关键词: harpacticoid copepod Nitocra sp.;WSSV;vector;transmission;Marsupenaeus japonicus
期刊名称:JOURNAL OF INVERTEBRATE PATHOLOGY ( 影响因子:2.841; 五年影响因子:3.368 )
ISSN: 0022-2011
年卷期: 2008 年 97 卷 1 期
页码:
收录情况: SCI
摘要: White Spot Syndrome Virus (WSSV) is now one of the most devastating and virulent viral agents threatening the penaeid shrimp culture industry and has been responsible for serious economic losses for shrimp farms worldwide. One remarkable characteristic of WSSV is its wide reservoir range, which contributes to its wide geographical distribution. Among epizootiological surveys, there is substantial evidence for WSSV-positive copepods found in shrimp farming ponds. Therefore, copepods are suspected to be the vector of WSSV. In the present study, nested-PCR analysis showed positive results in the harpacticoid copepod Nitocra sp. exposed to WSSV by virus-phytoplankton adhesion route. Oral route and intramuscular injection were used to test the pathogenicity of WSSV isolated from the WSSV-positive Nitocra sp. For the oral route of infection, Marsupenaeus japonicus postlarvae were fed with WSSV-positive copepods. The shrimp postlarvae in the infected treatment became WSSV-positive and occurred 52.50 +/- 5.00% mortality which was significant higher (P < 0.05) than that in the control treatment (20.00 +/- 0.00%) when postlarvae were fed with WSSV free copepods. In the intramuscular injection challenge, M. Japonicus juveniles were injected with the copepods inoculum extracted from the WSSV-positive Nitocra sp., and showed 72.50 +/- 9.57% mortality which was also significant higher (P < 0.05) than that in the control treatment (22.50 +/- 5.00%) when juveniles were received mock injection of a tissue homogenate prepared from WSSV-negative Nitocra sp. Based on these laboratory challenge studies, it was confirmed that the copepods can serve as a vector in WSSV transmission. (c) 2007 Elsevier Inc. All rights reserved.
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