Among the many subjects claiming the attention of this Association, none can be more important to the welfare of humanity than that of preventive medicine. The term implies an organized effort by the medical profession to protect mankind from attacks of those recognized causes of disease and death that can be avoided or destroyed. To avoid or destroy the cause is not only to escape the disease, but also to prevent the generation of countless germs fraught with danger. The list of pathogenic organisms whose appearance, characteristics and behavior are sufficiently known to enable us to avoid or destroy them, contains the names of the germs whose invasion of the human system results in the diseases most widespread and fatal, the scourges to which five deaths out of every ten may be traced.
Think of the results in one decade were the death rate diminished
MOODY HA. THE FUTURE OF PREVENTIVE MEDICINE.. JAMA. 1903;XLI(20):1199-1201. doi:10.1001/jama.1903.92490390023001f