Work-related asthma is the most commonly diagnosed occupational lung disease in the United States. Diisocyanates are a leading cause of work-related asthma. Diisocyanates are used in a number of industries. Recently, a series of worksite investigations in the State of Washington revealed methylene diphenyldiisocyanate (MDI) use and overexposures in the spray-on truck bed liner industry. MDI health effects, including work-related asthma, were identified in the employers' workers' compensation claim records. We present three work-related MDI asthma claims from the spray-on truck bed lining industry. The claims are accompanied by workplace exposure information. The case summaries may be used to help inform employers, workers, healthcare providers, and others involved with spray-on bed lining of the occupational asthma hazard in the industry.
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