Élie Metchnikoff
Klebs' works preceded some of the most important discoveries in medicine. He described acromegaly in 1884, two years before Pierre Marie. In 1878, he successfully inoculated syphilis in monkeys, antedating Élie Metchnikoff and Émile Roux by 25 years. He isolated colonies of bacteria nine years before Robert Koch. He was the first to produce tuberculosis experimentally in animals by the injection of milk from infected cows. He identified the typhoid bacillus (now named "Salmonella typhi") before Karl Joseph Eberth.