title: Acquisition versus loss of Helicobacter pylori infection in Japan: results from an 8-year birth cohort study.
abstract: Studies of the pattern of change in the epidemiology of Helicobacter pylori infection are scarce. A longitudinal cohort study consisted of 644 children and adults, and two independent cross-sectional surveys were conducted in rural Japan between 1986 and 1994. The anti-H. pylori IgG seroconversion rates were 1.1% and 1% per year for children and adults, respectively. The seroreversion rate per year was 1.8% for children and 1.5% for adults. The cohort study was confirmed by the two cross-sectional studies. H. pylori prevalence fell in all age groups in both children (odds ratio [OR] = 0.5, 95% confidence interval [CI] = 0.2-1.0, P = .05) and adults (OR = 0.4, 95% CI = 0.3-0.6, P = .001). The rate of loss of H. pylori infection was greater than the acquisition. Data regarding acquisition and loss of H. pylori infection are critical to understanding the epidemiology of the infection and to developing treatment and vaccination strategies.
authors.affiliation: Department of Laboratory Medicine, Shinshu University School of Medicine, Matsumoto, Japan.
authors.forename: T
authors.initials: T
authors.lastname: Kumagai
authors.forename: H M
authors.initials: HM
authors.lastname: Malaty
authors.forename: D Y
authors.initials: DY
authors.lastname: Graham
authors.forename: S
authors.initials: S
authors.lastname: Hosogaya
authors.forename: K
authors.initials: K
authors.lastname: Misawa
authors.forename: K
authors.initials: K
authors.lastname: Furihata
authors.forename: H
authors.initials: H
authors.lastname: Ota
authors.forename: C
authors.initials: C
authors.lastname: Sei
authors.forename: E
authors.initials: E
authors.lastname: Tanaka
authors.forename: T
authors.initials: T
authors.lastname: Akamatsu
authors.forename: T
authors.initials: T
authors.lastname: Shimizu
authors.forename: K
authors.initials: K
authors.lastname: Kiyosawa
authors.forename: T
authors.initials: T
authors.lastname: Katsuyama
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D000375:Aging; D002648:Child; D002675:Child, Preschool; D015331:Cohort Studies; D003430:Cross-Sectional Studies; D005500:Follow-Up Studies; D016481:Helicobacter Infections / Q000097:blood / Q000453:epidemiology* / Q000503:physiopathology; D016480:Helicobacter pylori; D006801:Humans; D007564:Japan / Q000453:epidemiology; D008137:Longitudinal Studies; D008875:Middle Aged