title: US prevalence of self-reported peanut, tree nut, and sesame allergy: 11-year follow-up.
abstract: BACKGROUND
  Allergy to peanuts and tree nuts (TNs) is the leading cause of fatal allergic reactions in the United States, and the prevalence appears to be increasing.
  
  
  OBJECTIVE
  We sought to determine the US prevalence of self-reported peanut, TN, and sesame allergy in 2008 and compare results with comparable surveys conducted in 1997 and 2002.
  
  
  METHODS
  A nationwide, cross-sectional, random telephone survey for peanut and TN allergy was conducted with a previously used questionnaire, with additional questions about sesame.
  
  
  RESULTS
  A total of 5,300 households (13,534 subjects) were surveyed (participation rate, 42% vs 52% in 2002 and 67% in 1997). Peanut allergy, TN allergy, or both was reported by 1.4% of subjects (95% CI, 1.2% to 1.6%) compared with 1.2% in 2002 and 1.4% in 1997. For adults, the prevalence was 1.3% (95% CI, 1.1% to 1.6%), which was not significantly different from prior surveys. However, the prevalence of peanut or TN allergy for children younger than 18 years was 2.1% (95% CI, 1.6% to 2.7%) compared with 1.2% in 2002 (P = .007) and 0.6% in 1997 (P < .001). The prevalence of peanut allergy in children in 2008 was 1.4% (95% CI, 1.0% to 1.9%) compared with 0.8% in 2002 (P = not significant) and 0.4% in 1997 (P < .0001). The prevalence of childhood TN allergy increased significantly across the survey waves (1.1% in 2008, 0.5% in 2002, and 0.2% in 1997). Sesame allergy was reported by 0.1% (95% CI, 0.0% to 0.2%).
  
  
  CONCLUSIONS
  Although caution is required in comparing surveys, peanut allergy, TN allergy, or both continue to be reported by more than 1% of the US population (eg, >3 million subjects) and appear to be increasingly reported among children over the past decade. Sesame allergy is reported much less commonly.
authors.affiliation: Elliot and Roslyn Jaffe Food Allergy Institute, Division of Allergy and Immunology, Department of Pediatrics, Mount Sinai School of Medicine, New York, NY 10029-6574, USA. scott.sicherer@mssm.edu
authors.forename: Scott H
authors.initials: SH
authors.lastname: Sicherer
authors.forename: Anne
authors.initials: A
authors.lastname: Muñoz-Furlong
authors.forename: James H
authors.initials: JH
authors.lastname: Godbold
authors.forename: Hugh A
authors.initials: HA
authors.lastname: Sampson
mesh_terms: D000328:Adult; D002648:Child; D003430:Cross-Sectional Studies; D005500:Follow-Up Studies; D005512:Food Hypersensitivity / Q000453:epidemiology*; D006801:Humans; D007407:Interviews as Topic; D021184:Nut Hypersensitivity / Q000453:epidemiology*; D021183:Peanut Hypersensitivity / Q000453:epidemiology*; D015995:Prevalence; D031685:Sesamum / Q000276:immunology; D014481:United States