When the history of the present great war is written a notable victory over the common enemy, disease, will be recorded as one of the greatest triumphs in this greatest of all conflicts. In all probability this triumphs over disease will also be recorded as the most important single factor in explanation of the stamina and long-sustained man-power of the involved nations; never before in the history of the world have so many men been engaged in combat with such freedom from internal deterioration due to disease not only among the warriors in preparation and at the line of battle, but also among the supporting civilian population;history records many instances of cessation of wars and sieges due to disease among offenders or defenders or both and a remarkable freedom from pestilence in the present conflict has undoubtedly played a prominent rSle in permitting it to reach the dimensions of the greatest of all wars.

1

Presidential address at the Fifth Annual Meeting of the American Association of Immunologists held at the University of Pennsylvania on March 29 and 30, 1918.

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