Kitasato Shibasaburō
In 1890 he published an article with Kitasato Shibasaburō reporting that they had developed "antitoxins" against both diphtheria and tetanus. They had injected diphtheria and tetanus toxins into guinea-pigs, goats and horses; when these animals developed immunity, they derived antitoxins (now known to contain antibodies) from their serum. This process would be called serum therapy by him at the time as he described it as a way to induce permanent immunity or "to stimulate the body's internal disinfection". These antitoxins could protect against and cure the diseases in non-immunized animals. In 1892 he started the first human trials of the diphtheria antitoxin, but they were unsuccessful. Successful treatment started in 1894, after the production and quantification of antitoxin had been optimized. During 1894, Behring was also awarded the Cameron Prize for Therapeutics of the University of Edinburgh.