Chronic occupational lung disease is characterized by

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Chronic occupational lung disease is caused by long-term inhalation of inorganic material.A latent period of 10 to 20 years may ensue before symptoms occur.One of the earliest manifestations is a progressive cough and dyspnea on exertion.The disease cannot be ruled out by a negative chest x-ray.Impairment of macrophage function is the primary mechanism through which inorganic particles initiate lung disease.

Chronic Occupational Lung Disease Is Characterized by