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Genotyping of Canine Parvovirus Type 2 VP2 Gene in Southern Taiwan in 2011

2011年南台灣犬小病毒VP2基因分型

摘要


犬小病毒(canine parvovirus type 2, CPV-2)為一無封套,單股正向之DNA病毒,且病毒於1978年首度分離證實以來,其基因序列仍不斷發生變異,產生不同的基因型別。犬小病毒為犬科動物重要的傳染性病毒性腸炎,本研究主要目的是調查南臺灣犬小病毒基因分型,先前中臺灣研究結果顯示中部地區犬小病毒基因分型主要是以CPV-2b為主。但本研究結果發現以聚合酶鏈鎖反應(polymerase chain reaction; PCR)進行基因分型,會將新型的CPV-2a基因型(new CPV-2a)分類為CPV-2b基因型,因此並無法完全用來區分CPV-2a及CPV-2b。而本研究採集南臺灣犬小病毒糞材54例,研究結果有35份檢體為新型的CPV-2a型別(65%),顯示臺灣南部地區傳染情形仍以CPV-2a為主。此外,嘉義地區犬小病毒VP2基因片段其胺基酸序列於324位置出現由異白胺酸(Isoleucine; Ile)取代先前發表之酪胺酸(Tyrosine; Tyr)。本研究是以分子生物技術進行犬小病毒分型,作為犬小病毒流行病學之調查,以其助於臺灣地區犬小病毒疾病之防疫控制。

並列摘要


Canine parvovirus type 2 (CPV-2) is a non-enveloped single-stranded DNA virus that was first recognized in 1978. Since then it has undergone evolution still generating new genetic variants. CPV-2 infection is the most important infectious viral enteritis to dogs. The aim of this study was to genotype CPV-2 in southern Taiwan. Previous study in central Taiwan demonstrated ”CPV-2b” as major canine parvovirus strains. This study demonstrated that, by PCR-based genotyping alone, could not discriminate ”CPV-2a” from ”CPV-2b” strains, because the ”new CPV-2a” strain would be assigned as ”CPV-2b” by PCR-based genotyping assay. This study showed that 35 out of 54 specimens (65%) were ”new CPV-2a” as the major CPV-2 strain in southern Taiwan. Besides, the VP2 gene of Chiayi isolates from dogs revealed an amino acid substitution at Ile-324 for Tyr-324 in other CPV strains. Molecular characterization of CPV-2 typing may provide CPV-2 epidemiological surveillance, even to improve the disease control in Taiwan.

並列關鍵字

Canine parvovirus PCR VP2 gene

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