title: Investigation of the association between infection with Helicobacter pylori and with TT virus, a novel DNA virus, in patients with gastroduodenal ulcer or ulcer scar.
abstract: OBJECTIVE
  Recently, a novel DNA virus (TT virus; TTV) has been isolated. Enteric transmission is suggested as a route of transmission of TTV, with high prevalence of this virus infection in the general population, and age and geographical distributions of TTV prevalence very similar to those of Helicobacterpylori infection. We analysed an association between TTV and H. pylori infection in patients with gastroduodenal ulcer or ulcer scar.
  
  
  METHODS
  In 181 patients with a gastroduodenal ulcer or ulcer scar (102 with a gastric lesion, 60 with a duodenal lesion, and 19 with both sites involved), specimens were cultured for H. pylori and TTV infection was sought in serum by a polymerase chain reaction.
  
  
  RESULTS
  H. pylori infection was demonstrated in 152 patients (84.0%) and TTV was detected in 168 patients (92.8%). Patients with TTV were significantly older than those without TTV (P = 0.0001), while no age difference was observed between patients with and without H. pylori infection. No difference was apparent in the prevalence of TTV infection between patients with and without H. pylori infection, and vice versa.
  
  
  CONCLUSIONS
  We found no association between TTV infection and H. pylori infection in patients with peptic ulcer diseases, which is consistent with a lack of association between TTV infection and peptic ulcer. However, larger studies including surveys of the general population will be required to analyse the overall association between TTV and H. pylori.
authors.affiliation: Department of Gastroenterology, Fujita Health University, School of Medicine, Toyoake, Aichi, Japan.
authors.forename: H
authors.initials: H
authors.lastname: Toyoda
authors.forename: C
authors.initials: C
authors.lastname: Nomura
authors.forename: M
authors.initials: M
authors.lastname: Watanabe
authors.forename: K
authors.initials: K
authors.lastname: Takahama
authors.forename: R
authors.initials: R
authors.lastname: Hobara
authors.forename: S
authors.initials: S
authors.lastname: Yokozaki
authors.forename: Y
authors.initials: Y
authors.lastname: Fukuda
authors.forename: H
authors.initials: H
authors.lastname: Nakano
mesh_terms: D000328:Adult; D017677:Age Distribution; D000368:Aged; D001483:Base Sequence; D002921:Cicatrix / Q000382:microbiology / Q000821:virology; D004266:DNA Virus Infections / Q000150:complications / Q000175:diagnosis / Q000453:epidemiology*; D004381:Duodenal Ulcer / Q000453:epidemiology* / Q000382:microbiology / Q000821:virology; D005260:Female; D016481:Helicobacter Infections / Q000150:complications / Q000175:diagnosis / Q000453:epidemiology*; D016480:Helicobacter pylori / Q000302:isolation & purification*; D006801:Humans; D008297:Male; D008875:Middle Aged; D008969:Molecular Sequence Data; D016133:Polymerase Chain Reaction; D015995:Prevalence; D011446:Prospective Studies; D012307:Risk Factors; D017678:Sex Distribution; D018709:Statistics, Nonparametric; D013276:Stomach Ulcer / Q000453:epidemiology* / Q000382:microbiology / Q000821:virology; D022783:Torque teno virus / Q000302:isolation & purification*