From the time of Jenner's discovery that the dried serum of cowpox prevented or modified smallpox when introduced into the human system, has existed the hope that remedies would be discovered somewhat of the same character which would cure or prevent all diseases.
But this bud of promise was slow in developing, and the bright expectations thus aroused were doomed to wait a century before they were even partially realized. As the ovum of the cicada septemdecem requires seventeen years to bring forth the mature insect, so the germ of Jenner's discovery after an incubation of one hundred years has blossomed into the science of bacteriology, which, through the labors of Pasteur, Koch, Behring and others, has already brought forth a wonderful harvest of relief from suffering and disease, and the day seems now at hand when, with a cure or preventive for every disease, cholera, yellow fever, diphtheria, leprosy,
VAUGHAN GT. SERUM THERAPY IN DISEASE.. JAMA. 1896;XXVII(9):472–474. doi:10.1001/jama.1896.02430870020001j