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any disease of the lung caused by chronic inhalation of dust, usually mineral dust of occupational or environmental origin. Some kinds of pneumoconioses are anthracosis, asbestosis, silicosis.
How the disease spreads. 1  Breathing in dust that is contaminated with rodent urine or droppings. 2  Direct contact with rodents or their urine and droppings. 3  Bite wounds, although this does not happen frequently.