title: Risk factors for atopy among school children in a rural area of Latin America.
abstract: BACKGROUND
  Infection with common childhood infectious diseases including geohelminth infections may provide protection against the development of atopy and allergic disease. Few studies have investigated risk factors for atopy among children living in rural areas of Latin America.
  
  
  OBJECTIVE
  To identify risk factors associated with atopy among school-age children in a rural area of Latin America.
  
  
  METHODS
  Analytic cross-sectional study of school-age children conducted in seven rural schools in Pichincha Province in Ecuador. Detailed risk factor information was obtained by questionnaire, stool samples were collected for identification of geohelminth parasites, and Mantoux testing was performed to determine tuberculin sensitization.
  
  
  RESULTS
  A total of 1002 children from seven rural schools were recruited. The prevalence of geohelminth infections was high (70.1% were infected with at least one geohelminth parasite) and the prevalence of allergic sensitization was high (20.0% had evidence of aeroallergen sensitization). Factors associated with significant protection against atopy in multivariate analyses were the presence of overcrowding in the child's home, low socio-economic level, and infection with geohelminth parasites, and the protective effects of the three factors were statistically independent.
  
  
  CONCLUSIONS
  Low socio-economic level, overcrowding and geohelminth infection, are independently protective against atopy among school-age children living in a rural area of Latin America.
authors.affiliation: Laboratorio de Investigaciones, Hospital Pedro Vicente Maldonado, Pichincha Province, Ecuador. pcooper@ecnet.ec
authors.forename: P J
authors.initials: PJ
authors.lastname: Cooper
authors.forename: M E
authors.initials: ME
authors.lastname: Chico
authors.forename: L C
authors.initials: LC
authors.lastname: Rodrigues
authors.forename: D P
authors.initials: DP
authors.lastname: Strachan
authors.forename: H R
authors.initials: HR
authors.lastname: Anderson
authors.forename: E A
authors.initials: EA
authors.lastname: Rodriguez
authors.forename: D P
authors.initials: DP
authors.lastname: Gaus
authors.forename: G E
authors.initials: GE
authors.lastname: Griffin
mesh_terms: D000293:Adolescent; D000818:Animals; D000829:Animals, Domestic; D002648:Child; D003430:Cross-Sectional Studies; D004484:Ecuador; D005260:Female; D005783:Gender Identity; D006373:Helminthiasis / Q000276:immunology*; D006801:Humans; D006969:Hypersensitivity, Immediate / Q000469:parasitology / Q000517:prevention & control*; D008297:Male; D012307:Risk Factors; D012424:Rural Population; D012923:Social Class; D014376:Tuberculosis / Q000276:immunology