title: Different expression of Helicobacter pylori gastritis in children: evidence for a specific pediatric disease?
abstract: BACKGROUND
  Infection with Helicobacter pylori causes active chronic gastritis. Once the infection is acquired, gastritis will persist for almost the rest of one's life. To date, very few data are available on H. pylori gastritis in relation to age. Therefore, we attempted to investigate whether H. pylori gastritis in children exhibits features different from H. pylori gastritis in adults of two different age groups.
  
  
  METHODS
  Fifty consecutive children with a median age of 11 years (range, 3-18 years) were compared with two groups of 50 adult patients, one group with a median age of 43 (range, 19-56 years) and another group with a median age of 70 years (range, 59-86 years). All patients had H. pylori gastritis unrelated to active peptic ulcer disease. Two biopsy specimens were taken from the antrum and two from the corpus, and the following gastritis parameters were evaluated: degree and activity of gastritis, H, pylori colonization, replacement of foveolar epithelium by regenerative epithelium, mucous depletion, presence of atrophic gastritis with intestinal metaplasia, and presence of lymphoid follicles.
  
  
  RESULTS
  Degree and activity of gastritis, extent of H. pylori colonization, degree of replacement by regenerative epithelium, extent of mucous depletion, degree of atrophic gastritis with intestinal metaplasia, and the presence of lymphoid follicles in the antrum, as well as the presence of lymphoid follicles in the corpus differed significantly (chi-square test: p < .05). All these differences--except the once frequent occurrence of atrophic gastritis with intestinal metaplasia in adults--were attributable to a higher expression of these gastritis parameters in children.
  
  
  CONCLUSIONS
  We conclude that H. pylori gastritis, particularly in the antrum, is more severely expressed in childhood. One reason for this might be a child-specific immune response to an infection with H. pylori. Alternatively, infection may represent a pediatric disease characterized by a nonatrophic, highly expressed form of gastritis, which changes its appearance once the host becomes adapted over time.
authors.affiliation: Department of Internal Medicine II, Klinikum Grosshadern, University of Munich, Germany.
authors.forename: A
authors.initials: A
authors.lastname: Meining
authors.forename: R
authors.initials: R
authors.lastname: Behrens
authors.forename: N
authors.initials: N
authors.lastname: Lehn
authors.forename: E
authors.initials: E
authors.lastname: Bayerdörffer
authors.forename: M
authors.initials: M
authors.lastname: Stolte
mesh_terms: D000293:Adolescent; D000328:Adult; D000367:Age Factors; D000368:Aged; D000369:Aged, 80 and over; D001284:Atrophy; D002648:Child; D002908:Chronic Disease; D005756:Gastritis / Q000453:epidemiology / Q000473:pathology*; D016481:Helicobacter Infections / Q000453:epidemiology / Q000382:microbiology / Q000473:pathology*; D016480:Helicobacter pylori / Q000302:isolation & purification; D006801:Humans; D007223:Infant; D008221:Lymphoid Tissue / Q000473:pathology; D008679:Metaplasia