title: Towards an age-dependent transmission model of acquired and sporadic Creutzfeldt-Jakob disease.
abstract: BACKGROUND
  Sporadic Creutzfeldt-Jakob disease (sCJD) might be transmitted by surgery. The purpose of this study was to investigate potential susceptibility to sCJD from surgery at juvenile age and in early adulthood.
  
  
  METHODS
  From Danish and Swedish national registries we identified 167 definite and probable sCJD cases with onset from 1987 through 2003, and 835 age-, sex- and residence-matched controls along with their surgical histories. Main, anatomically or etiologically classified surgical procedures followed by a ≥20-year lag were analyzed using logistic regression, and stratified by age at first-registered surgical discharge.
  
  
  RESULTS
  The risk of having a diagnosis of CJD depended strongly on age at first surgery with odds ratio (OR) of 12.80 (95% CI 2.56-64.0) in patients <30 years, 3.04 (95% 1.26-7.33) in 30-39 years, and 1.75 (95% CI 0.89-3.45) in ≥40 years, for anatomically classified surgical procedures. Similar figures were obtained for etiologically classified surgical procedures.
  
  
  CONCLUSIONS
  Risk of surgical-acquired sCJD depends on age at exposure; this pattern is similar to age-specific profiles reported for CJD accidentally transmitted by human pituitary-derived growth hormone and susceptibility curves for variant CJD estimated after adjustment for dietary exposure to bovine spongiform encephalopathy. There might be an age-at-exposure-related susceptibility to acquire all CJD forms, including sCJD from routine surgery.
authors.affiliation: Department of Applied Epidemiology, National Centre for Epidemiology, Carlos III Institute of Health; and Consortium for Biomedical Research in Neurodegenerative Diseases (CIBERNED), Madrid, Spain.
authors.forename: Jesús
authors.initials: J
authors.lastname: de Pedro-Cuesta
authors.affiliation: Department of Applied Epidemiology, National Centre for Epidemiology, Carlos III Institute of Health; and Consortium for Biomedical Research in Neurodegenerative Diseases (CIBERNED), Madrid, Spain.
authors.forename: Ignacio
authors.initials: I
authors.lastname: Mahillo-Fernandez
authors.affiliation: Carlos III Institute of Health, and Consortium for Biomedical Research in Neurodegenerative Diseases (CIBERNED), Majadahonda, Spain; and Alzheimer's Disease Center, Reina Sofia Foundation, Madrid, Spain.
authors.forename: Miguel
authors.initials: M
authors.lastname: Calero
authors.affiliation: Alzheimer's Disease Center, Reina Sofia Foundation, Madrid, Spain.
authors.forename: Alberto
authors.initials: A
authors.lastname: Rábano
authors.affiliation: Karolinska Institute, Neurology Division, Stockholm, Sweden.
authors.forename: Mabel
authors.initials: M
authors.lastname: Cruz
authors.affiliation: Karolinska Institute, Neurology Division, Stockholm, Sweden.
authors.forename: Åke
authors.initials: Å
authors.lastname: Siden
authors.affiliation: Department of Applied Epidemiology, National Centre for Epidemiology, Carlos III Institute of Health; and Consortium for Biomedical Research in Neurodegenerative Diseases (CIBERNED), Madrid, Spain.
authors.forename: Pablo
authors.initials: P
authors.lastname: Martínez-Martín
authors.affiliation: National Hospital, Copenhagen, Denmark.
authors.forename: Henning
authors.initials: H
authors.lastname: Laursen
authors.affiliation: Department of Applied Epidemiology, National Centre for Epidemiology, Carlos III Institute of Health; and Consortium for Biomedical Research in Neurodegenerative Diseases (CIBERNED), Madrid, Spain.
authors.forename: María
authors.initials: M
authors.lastname: Ruiz-Tovar
authors.affiliation: Statens Serum Institut, Copenhagen, Denmark.
authors.forename: Kåre
authors.initials: K
authors.lastname: Mølbak
mesh_terms: D000328:Adult; D000367:Age Factors; D016022:Case-Control Studies; D007562:Creutzfeldt-Jakob Syndrome / Q000453:epidemiology* / Q000401:mortality / Q000601:surgery / Q000635:transmission*; D003627:Data Interpretation, Statistical; D005260:Female; D006801:Humans; D016015:Logistic Models; D008297:Male; D008875:Middle Aged; D015233:Models, Statistical; D012042:Registries; D012307:Risk Factors; D055815:Young Adult