During WW1, the Rockefeller Institute also sent its experimental anti-meningococcal serum to England, France, Belgium, Italy and other countries, helping spread the epidemic worldwide.
During the pandemic of 1918-19, the so-called “Spanish Flu” killed 50-100 million people, including many soldiers.
Many people do not realize that disease killed far more soldiers on all sides than machine guns or mustard gas or anything else typically associated with WWI.