title: [Study of molecular epidemiology and genetic diversity of human bocvirus in children with respiratory tract infection].
abstract: OBJECTIVE
  To investigate the epidemiological features and clinical features of human bocavirus (HBoV) infection in children with respiratory tract infection in Sichuan, and to analysis the HBoV VP1 gene mutation characteristics of Sichuan clinical strains.
  
  
  METHODS
  Nasopharyngeal secretions were collected from 787 hospitalized children with respiratory tract infection. PCR was used to detect HBoV. The VP1 genetic variations of the nucleotide and amino acid were analysised respectively.
  
  
  RESULTS
  Out of 787 specimens from respiratory tract, 8.26% (65/787) were positive for HBoV, 50.77% (33/65) were co-detected with other respiratory viruses. HBoV is usually detected in children under 3 years of age, the positive rate of male children was higher than female children. Most frequently clinical symptoms of HBoV were cough, fever and expectoration. Phylogenetic analyses showed that all the 8 clinical strains were HBoV1 genetype. GA+AG transitions were the most frequent transitions detected, while the nonsynonymous mutations were more than synonymous mutations.
  
  
  CONCLUSIONS
  HBoV is an important pathogen of respiratory tract infection in children in Sichuan. The main type of nucleotide variation is transitions. Amino acids mutations may relate to immune evasion.
authors: Department of Medical Technology, West China School of Public Health, Sichuan University, Chengdu 610041, China.
authors: Jing-Yan
authors: JY
authors: Yang
authors: Department of Medical Technology, West China School of Public Health, Sichuan University, Chengdu 610041, China.
authors: Peng-Wei
authors: PW
authors: Hu
authors: Department of Medical Technology, West China School of Public Health, Sichuan University, Chengdu 610041, China.
authors: Rui
authors: R
authors: Chen
authors: Department of Medical Technology, West China School of Public Health, Sichuan University, Chengdu 610041, China.
authors: Lei
authors: L
authors: Lu
authors: Department of Medical Technology, West China School of Public Health, Sichuan University, Chengdu 610041, China.
authors: Xiao-Fang
authors: XF
authors: Pei
mesh_terms: D002648:Child; D005260:Female; D014644:Genetic Variation; D005838:Genotype; D056661:Human bocavirus / Q000235:genetics*; D006801:Humans; D008297:Male; D017720:Molecular Epidemiology; D009305:Nasopharynx / Q000821:virology; D010322:Parvoviridae Infections / Q000821:virology; D010802:Phylogeny; D016133:Polymerase Chain Reaction; D012141:Respiratory Tract Infections / Q000821:virology*