title: [Influence of migration on the prevalence of serologic hepatitis B markers in a rural community. 1. Analysis of prevalence by birthplace].
abstract: Distribution of hepatitis B serological markers according to people's birthplaces and area of residence (urban/rural) was studied as a part of a field epidemiological research project carried out in Cássia dos Coqueiros, a small rural community of S. Paulo State, Brazil. The total prevalence of HBV markers was 7.7%, with rural showing a higher risk than urban inhabitants (9.8% as against 4.9%, respectively). Analysis of prevalence according to people's birthplaces revealed the highest value among those from other Brazilian states (15.8%), followed by people from other municipalities of the State of S. Paulo (9.2%). Those born in Cássia dos Coqueiros and particularly in Ribeirão Preto (the main city of the area, located 80 kilometers away), showed the lowest values of prevalence (5.2% and 2.5%, respectively). The importance of studying people's birthplaces when field epidemiological studies on hepatitis B are carried out is stressed. This variable is considered to be capable of exercising an influence on the natural history of the disease in a community, and may even explain differences in the distribution of markers in apparently similar populations.
authors.affiliation: Departamento de Medicina Social, Faculdade de Medicina de Ribeirão Preto, Universidade de São Paulo, Brasil.
authors.forename: A D
authors.initials: AD
authors.lastname: Passos
authors.forename: U A
authors.initials: UA
authors.lastname: Gomes
authors.forename: J F
authors.initials: JF
authors.lastname: Figueiredo
authors.forename: M M
authors.initials: MM
authors.lastname: do Nascimento
authors.forename: J M
authors.initials: JM
authors.lastname: de Oliveira
authors.forename: A M
authors.initials: AM
authors.lastname: Gaspar
authors.forename: C F
authors.initials: CF
authors.lastname: Yoshida
mesh_terms: D000293:Adolescent; D000328:Adult; D000367:Age Factors; D000368:Aged; D001938:Brazil / Q000453:epidemiology; D002648:Child; D002675:Child, Preschool; D005260:Female; D006509:Hepatitis B / Q000453:epidemiology* / Q000276:immunology; D006510:Hepatitis B Antibodies / Q000032:analysis; D006514:Hepatitis B Surface Antigens / Q000032:analysis; D006801:Humans; D007223:Infant; D007231:Infant, Newborn; D008297:Male; D008875:Middle Aged; D015995:Prevalence; D012111:Residence Characteristics; D012424:Rural Population
chemical_list: D006510:Hepatitis B Antibodies; D006514:Hepatitis B Surface Antigens
vernacular_title: Influência da migração na prevalência de marcadores sorológicos de hepatite B em comunidade rural. 1-Análise da prevalência segundo local de nascimento.