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  • Title: Low levels of exposure to libby amphibole asbestos and localized pleural thickening.
    Author: Christensen KY, Bateson TF, Kopylev L.
    Journal: J Occup Environ Med; 2013 Nov; 55(11):1350-5. PubMed ID: 24164765.
    Abstract:
    OBJECTIVE: To explore the relationship between low levels of exposure to Libby amphibole asbestos (LAA) and pleural abnormalities, specifically localized pleural thickening (LPT). METHODS: Three studies presenting the risks associated with quantitative LAA exposure estimates were reviewed, paying particular attention to lower exposure ranges. RESULTS: Studies reviewed were conducted among workers exposed to LAA at mining and milling operations in Libby, Montana, at a vermiculite processing facility in Marysville, Ohio, and community residents exposed to LAA from a vermiculite processing facility in Minneapolis, Minnesota. Pleural abnormalities were evaluated using radiographs. Despite differences in study populations and design, each study found that cumulative inhalation LAA exposure was associated with increased risk of LPT even at low levels of exposure. CONCLUSIONS: Inhalation exposure to LAA is associated with increased risk of LPT even at the lowest levels of exposure in each study.
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