title: A cohort study on Helicobacter pylori serology before and after induction in the Hellenic Navy.
abstract: OBJECTIVE
  To determine whether military personnel are at increased risk of Helicobacter pylori (HP) infection in proportion to their occupation during their national service in the armed forces.
  
  
  METHODS
  Serum samples were obtained from 142 young male Hellenic Navy recruits (mean age, 23.6 years; range, 20-30 years). The first specimen was obtained during their induction into the Hellenic Navy, and the second was obtained after having served for 8 months in different services within Greece. An enzyme-linked immunosorbent assay was used to detect HP-specific immunoglobulin G antibodies. Statistical analysis was performed using the sign test, logistic regression, and the chi 2 test.
  
  
  RESULTS
  The crude seropositivity rate increased from 19.01% to 28.16% (p = 0.007). Of the 115 initially seronegative subjects, 17 (14.8%) seroconverted. The most important predictive variable for seroconversion was deployment in a crowded commission (> 20 subjects) combined with the absence of air conditioning in personnel sleeping quarters (p = 0.03, odds ratio = 3.14).
  
  
  CONCLUSIONS
  Our data suggest that the risk of HP infection increases among 20- to 30-year-old individuals during their national service. Degrading environmental conditions may play a major role in HP transmission between young adults who serve in the armed forces.
authors.affiliation: Department of Surgery, Naval Hospital of Salamis, Salamis, Greece.
authors.forename: I
authors.initials: I
authors.lastname: Kyriazanos
authors.forename: I
authors.initials: I
authors.lastname: Ilias
authors.forename: G
authors.initials: G
authors.lastname: Lazaris
authors.forename: P
authors.initials: P
authors.lastname: Hountis
authors.forename: I
authors.initials: I
authors.lastname: Deros
authors.forename: A
authors.initials: A
authors.lastname: Dafnopoulou
authors.forename: K
authors.initials: K
authors.lastname: Datsakis
mesh_terms: D000328:Adult; D000907:Antibodies, Bacterial / Q000097:blood*; D000942:Antigens, Bacterial / Q000097:blood; D016009:Chi-Square Distribution; D015331:Cohort Studies; D004797:Enzyme-Linked Immunosorbent Assay; D006115:Greece / Q000453:epidemiology; D016481:Helicobacter Infections / Q000097:blood / Q000453:epidemiology* / Q000276:immunology; D016480:Helicobacter pylori / Q000276:immunology*; D006801:Humans; D016015:Logistic Models; D008297:Male; D008889:Military Personnel; D009326:Naval Medicine; D012307:Risk Factors; D016036:Seroepidemiologic Studies; D011795:Surveys and Questionnaires; D013997:Time Factors
chemical_list: D000907:Antibodies, Bacterial; D000942:Antigens, Bacterial