Kitasato Shibasaburō
Emil von Behring and Kitasato Shibasaburō discovered in 1890 that diphtheria and tetanus toxins were neutralized in the bloodstream of animals by substances they called "antitoxins", which were specific for the respective toxin. Behring received the first Nobel Prize in Physiology or Medicine for their find in 1901. A year after the discovery, Paul Ehrlich used the term "antibodies" (German "Antikörper") for these antitoxins.