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Diseases of Aquatic Organisms

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DAO 97:17-23 (2011)  -  DOI:

Epidemiology and phylogenetic analysis of Taura ­syndrome virus in cultured Pacific white shrimp Litopenaeus vannamei B. in Taiwan

LiTing Cheng1, Wen-Hui Lin2,4, Pei-Chyi Wang2,3, Ming-An Tsai2, Ping-Yueh Ho2, Jung-Pin Hsu4, Red-Shyong Chern2, Shih-Chu Chen1,2,*

1Graduate Institute of Animal Vaccine, 2Department of Veterinary Medicine, 3Department of Tropical Agriculture and International Cooperation, National Pingtung University of Science and Technology, Pingtung 91201, Taiwan
4Present address: Pingtung Hsien Livestock Disease Control Center, Pingtung, Taiwan

ABSTRACT: Taura syndrome virus (TSV) has spread worldwide, causing significant economic losses since Taura syndrome was first described in Ecuador in 1992. To determine the prevalence and impact of TSV infection on the shrimp farming industry in Taiwan, Pacific white shrimp Litopenaeus vannamei B. were collected from 220 farms between 2004 and 2006 for viral detection by reverse transcription polymerase chain reaction. Data showed that the overall TSV prevalence rate was 20% (43/220 farms). Comparing shrimp growth stages, TSV prevalence rates were 4% for postlarvae, 24% for juveniles, 24% for subadults, 32% for adults, and 5% for brooders. Among TSV-positive farms, average infection incidence was 35% in postlarvae farms, 55% in juvenile farms, 39% in subadult farms, 31% in adult farms, and 20% in brooder farms. Notably, TSV was also detected in Exopalaemon orientis H. from 1 of 10 farms. Tail fans and appendages had red pigmentation, which is characteristic of TSV infection. Of shrimp with pathological lesions, 100% had lesions on tail fans, 88% on appendages, and 80% in gills. Sequence comparison using the TSV VP1 (structural protein) gene showed that 9 isolates from the farms had 92.3 to 99.5% nucleotide sequence identity with strains in the GenBank database from Taiwan (AF406789 and AY355310) and Venezuela (DQ212790). This is the first broad epidemiological study of TSV infection in L. vannamei in Taiwan.

KEY WORDS: Taura syndrome virus · Litopenaeus vannamei · Taiwan

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Cite this article as: Cheng LT, Lin WH, Wang PC, Tsai MA and others (2011) Epidemiology and phylogenetic analysis of Taura ­syndrome virus in cultured Pacific white shrimp Litopenaeus vannamei B. in Taiwan. Dis Aquat Org 97:17-23.

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