title: Asbestos-related radiographic findings among household contacts of workers exposed to Libby vermiculite: impact of workers' personal hygiene practices.
abstract: OBJECTIVE
  To explore the potential impact of worker hygiene by determining the prevalence of radiographic changes consistent with asbestos exposure among household contacts of workers exposed to Libby vermiculite that contained amphibole fibers.
  
  
  METHODS
  Workers and household contacts had chest radiographs and completed questionnaires regarding hygiene and potential exposure pathways.
  
  
  RESULTS
  Participants included 191 household contacts of 118 workers. One household contact (0.5%) had localized pleural thickening, and three (1.6%) had irregular opacities at profusion category 1/0 or greater. Worker radiographs demonstrated pleural changes in 45% and irregular opacities at profusion category 1/0 or greater in 8%.
  
  
  CONCLUSIONS
  Libby vermiculite-exposed workers demonstrated an elevated prevalence of pleural and interstitial chest radiographic changes. There was, however, no increased prevalence of similar changes among household contacts, likely because of personal hygiene measures taken by the majority of workers.
authors.affiliation: From the Department of Environmental Health (Messrs Hilbert and Borton, and Drs Rohs and Lockey), University of Cincinnati College of Medicine, Cincinnati, Ohio; Department of Environmental Health Sciences (Dr Franzblau), University of Michigan School of Public Health, Ann Arbor, Mich; Department of Rehabilitation Sciences (Dr Dunning), University of Cincinnati College of Allied Health Sciences, Cincinnati, Ohio; and Department of Internal Medicine (Drs Rohs and Lockey), Pulmonary Division, University of Cincinnati College of Medicine, Cincinnati, Ohio.
authors.forename: Timothy J
authors.initials: TJ
authors.lastname: Hilbert
authors.forename: Alfred
authors.initials: A
authors.lastname: Franzblau
authors.forename: Kari K
authors.initials: KK
authors.lastname: Dunning
authors.forename: Eric K
authors.initials: EK
authors.lastname: Borton
authors.forename: Amy M
authors.initials: AM
authors.lastname: Rohs
authors.forename: James E
authors.initials: JE
authors.lastname: Lockey
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D000538:Aluminum Silicates / Q000633:toxicity*; D017636:Asbestos, Amphibole / Q000633:toxicity*; D003020:Clothing; D004781:Environmental Exposure; D005192:Family Health; D005260:Female; D006801:Humans; D006920:Hygiene; D007846:Laundering; D008168:Lung / Q000000981:diagnostic imaging*; D008297:Male; D008875:Middle Aged; D016273:Occupational Exposure; D010994:Pleura / Q000000981:diagnostic imaging*; D011859:Radiography; D011795:Surveys and Questionnaires
chemical_list: D000538:Aluminum Silicates; D017636:Asbestos, Amphibole; C003760:vermiculite