title: Hygiene and the cytokine jungle in Brazil.
authors.forename: Petra Ina
authors.initials: PI
authors.lastname: Pfefferle
authors.forename: Erika
authors.initials: E
authors.lastname: von Mutius
mesh_terms: D001249:Asthma / Q000276:immunology*; D004781:Environmental Exposure; D005260:Female; D006801:Humans; D061148:Hygiene Hypothesis; D006969:Hypersensitivity, Immediate / Q000276:immunology*; D008297:Male