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Silicosis in slate pencil workers: I. An environmental and medical study.

An environmental and medical survey was undertaken in the slate-pencil industry in the central part of India. The industrial hygiene survey revealed that concentrations of free silica dust were very high. The medical survey, involving 593 workers, revealed that the prevalence of silicosis in this industry was 54.6%. Of these, 17.7% of workers had conglomerate silicosis (progressive massive fibrosis, PMF). The radiologic appearance of simple and conglomerate silicosis resembled closely the simple pneumoconiosis and progressive massive fibrosis (PMF) among other occupational groups exposed to free silica and also found in coal workers. The pulmonary lesions were detectable after a relatively short duration of exposure. The short latent period of development and the high prevalence of silicosis observed among these workers are related to exposure to high concentrations of siliceous dust in the work environment.

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