title: Molecular epidemiology of porcine Cytomegalovirus (PCMV) in Sichuan Province, China: 2010-2012.
abstract: Porcine cytomegalovirus (PCMV) is an immunosuppressive virus that mainly inhibits the immune function of the macrophage and T-cell lymphatic systems, and has caused huge economic losses to the porcine breeding industry. Molecular epidemiological investigation of PCMV is important for prevention and treatment, and this study is the first such investigation in Sichuan Province, Southwest China. A PCMV positive infection rate of 84.4% (865/1025) confirmed that PCMV is widely distributed in Sichuan Province. A phylogenetic tree was constructed based on the PCMV glycoprotein B gene (gB) nucleotide and amino acid sequences from 24 novel Sichuan isolates and 18 other PCMV gB sequences from Genbank. PCMV does not appear to have evolved into different serotypes, and two distinct sequence groups were identified (A and B). However, whether PCMV from this region has evolved into different genotypes requires further research. Analysis of the amino acid sequences confirmed the conservation of gB, but amino acid substitutions in the major epitope region have caused antigenic drift, which may have altered the immunogenicity of PCMV.
authors.affiliation: Animal Biotechnology Center, College of Veterinary Medicine, Sichuan Agricultural University, Ya' an, China.
authors.forename: Xiao
authors.initials: X
authors.lastname: Liu
authors.forename: Shan
authors.initials: S
authors.lastname: Liao
authors.forename: Ling
authors.initials: L
authors.lastname: Zhu
authors.forename: Zhiwen
authors.initials: Z
authors.lastname: Xu
authors.forename: Yuancheng
authors.initials: Y
authors.lastname: Zhou
mesh_terms: D000595:Amino Acid Sequence; D000818:Animals; D001483:Base Sequence; D002681:China / Q000453:epidemiology; D003587:Cytomegalovirus / Q000145:classification / Q000235:genetics*; D003586:Cytomegalovirus Infections / Q000453:epidemiology / Q000662:veterinary* / Q000821:virology; D019143:Evolution, Molecular; D040961:Genetic Drift; D017720:Molecular Epidemiology; D008969:Molecular Sequence Data; D010802:Phylogeny; D013552:Swine; D013553:Swine Diseases / Q000453:epidemiology* / Q000821:virology; D014759:Viral Envelope Proteins / Q000145:classification / Q000235:genetics*
chemical_list: D014759:Viral Envelope Proteins; C040495:glycoprotein B, Simplexvirus