Preventable diseases; the scope of public health.

Abstract The purpose of a department of public health is to put into effect for the benefit of all the people of a community the practical lessons of preventive medicine. The scope of public health work is chiefly determined by our knowledge of the causes of the preventable diseases. We do not know how to prevent all diseases. We do, however, know effective ways to prevent or to reduce the occurrence of at least a dozen varieties of disease. Every health department ought to provide for a program and services which will prevent so far as possible the preventable diseases and the preventable hazards to health. To concentrate on prevention is to avoid diversion by specious arguments into the fields of medical care of the sick.