title: Mapping the history and current situation of research on John Cunningham virus - a bibliometric analysis.
abstract: BACKGROUND
  John Cunningham virus (JCV) constitutes a family of polyoma viruses, which plays important roles in the progressive multifocal leukoencephalopathy (PML) and tumorigenesis. However, no bibliometric investigation has been reported to guide the researchers and potential readers.
  
  
  METHODS
  Papers were collected from database Sci-expanded and Pubmed until May 22, 2008. The highly-productive authors, institutes and countries, highly-cited authors and journals were ranked. The highly-cited articles were subjected to co-citation and chronological analysis with highly-frequent MeSH words for co-occurrence analysis.
  
  
  RESULTS
  Until now, 1785 articles about JCV were indexed in Sci-expanded and 1506 in Pubmed. The main document type was original article. USA, Japan and Italy were the largest three producers about JCV. Temple University published 128 papers and ranked the top, followed by University of Tokyo. Khalili K and Yogo Y became the core authors due to more than 20 documents produced. Journal of Neurovirology published more than 15 papers and ranked the top. Padgett BL and Berger JR were the first two highly-cited authors. Journal of Virology and Journal of Neurovirology respectively ranked to the first two highly-cited journals. These top highly-cited articles were divided into 5 aspects: (1) The correlation between JC virus and tumors; (2) Causal correlation of JCV with PML; (3) Polyoma virus infection and its related diseases in renal-allograft recipients; (4) Detection of JCV antibody, oncogene and its encoding protein; (5) Genetics and molecular biology of JCV. The MeSH/subheadings were classified into five groups: (1) JCV and virus infectious diseases; (2) JCV pathogenicity and pathological appearance of PML; (3) JCV isolation and detection; (4) Immunology of JCV and PML; (5) JCV genetics and tumors.
  
  
  CONCLUSIONS
  JCV investigation mainly focused on its isolation and detection, as well as its correlation with PML and tumors. Establishment of transgenic animal model using JCV T antigen would be a hopeful and useful project in the further study.
authors.affiliation: Department of Biochemistry and Molecular Biology, College of Basic Medicine, China Medical University, Shenyang, PR China. zheng_huachuan@hotmail.com
authors.forename: Hua-chuan
authors.initials: HC
authors.lastname: Zheng
authors.forename: Lei
authors.initials: L
authors.lastname: Yan
authors.forename: Lei
authors.initials: L
authors.lastname: Cui
authors.forename: Yi-fu
authors.initials: YF
authors.lastname: Guan
authors.forename: Yasuo
authors.initials: Y
authors.lastname: Takano
mesh_terms: D000047:Academies and Institutes / Q000706:statistics & numerical data; D000818:Animals; D001319:Authorship; D015706:Bibliometrics; D006801:Humans; D007577:JC Virus; D046650:Medical Subject Headings; D010506:Periodicals as Topic / Q000706:statistics & numerical data; D039781:PubMed