The Committee on Pneumoconiosis and the Committee on Standards of the American Public Health Association, at a joint meeting in November, 1932, adopted the following definition of silicosis:
Silicosis is a disease due to breathing air containing silica (SiO2) characterized anatomically by generalized fibrotic changes and the development of miliary nodulation in both lungs, and clinically by shortness of breath, decreased chest expansion, lessened capacity for work, absence of fever, increased susceptibility to tuberculosis (some or all of which symptoms may be present) and by characteristic x-ray findings. The disease is divided arbitrarily into first, second and third stages for convenience of description and possible compensation purposes.
I wish to make clear that in this discussion we are concerned with true silicosis and not with other forms of pneumonoconiosis due to the inhalation of dusts containing combined silica in the form of silicates or of organic dusts. Numerous dusts
LANZA AJ. ETIOLOGY OF SILICOSIS. JAMA. 1933;101(8):583–584. doi:10.1001/jama.1933.02740330015005
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