title: High prevalence of torque teno sus virus in China and genetic diversity of the 5' non-coding region.
abstract: Members of the family Anelloviridae are emerging circular DNA viruses infecting many species of vertebrates including pigs. To date, members of two distinct genera, Iotatorquevirus, including torque teno sus virus 1a and torque teno sus virus 1b (TTSuV1a and TTSuV1b), and Kappatorquevirus, including torque teno sus virus k2a and torque teno sus virus k2b (TTSuVk2a and TTSuVk2b), have been identified in domestic pigs and wild boars. The goal of this study was to evaluate the prevalence and genetic diversity of these viruses based on 5' non-coding genes in Chinese swine herds experiencing clinical symptoms. One hundred eighty-five clinical samples from 11 different regions, collected during 2008-2009, were analyzed using a PCR method, and the results revealed a high TTSuV-positive rate of 78.9 % (146/185) in pigs. Moreover, we detected co-infection with multiple TTSuV strains in the same pig. Nucleotide sequencing results revealed greater genetic diversity within the genus Kappatorquevirus than within the genus Iotatorquevirus. In addition, TTSuVk2b, a novel virus discovered in New Zealand in 2012, was also identified in this study. In summary, the present work helps us obtain more knowledge about the epidemiology and genetic diversity of TTSuVs.
authors: Department of Swine Infectious Diseases, Shanghai Veterinary Research Institute, Chinese Academy of Agricultural Sciences, No. 518 Ziyue Road, Minhang District, Shanghai, China. zhaishaolun@163.com
authors: Shao-Lun
authors: SL
authors: Zhai
authors: Jin-Xue
authors: JX
authors: Long
authors: Wen-Kang
authors: WK
authors: Wei
authors: Qin-Ling
authors: QL
authors: Chen
authors: Man-Lin
authors: ML
authors: Luo
authors: Dian-Hong
authors: DH
authors: Lv
authors: Da-Cheng
authors: DC
authors: Wu
authors: Fei
authors: F
authors: Gao
authors: Shi-Shan
authors: SS
authors: Yuan
authors: Guang-Zhi
authors: GZ
authors: Tong
authors: Zu-Zhang
authors: ZZ
authors: Wei
mesh_terms: D000818:Animals; D002681:China / Q000453:epidemiology; D016000:Cluster Analysis; D004266:DNA Virus Infections / Q000453:epidemiology / Q000662:veterinary* / Q000821:virology; D004279:DNA, Viral / Q000737:chemistry / Q000235:genetics*; D014644:Genetic Variation; D005838:Genotype; D008969:Molecular Sequence Data; D016133:Polymerase Chain Reaction; D015995:Prevalence; D017422:Sequence Analysis, DNA; D013552:Swine; D013553:Swine Diseases / Q000453:epidemiology* / Q000821:virology*; D022783:Torque teno virus / Q000145:classification* / Q000235:genetics / Q000302:isolation & purification*
chemical_list: D004279:DNA, Viral