Kitasato, Yersin, and the plague bacillus.
D049672:History, 19th Century; D049673:History, 20th Century; D006723:Hong Kong; D007564:Japan; D008829:Microbiology / Q000266:history*; D010930:Plague / Q000209:etiology / Q000266:history*; D015010:Yersinia pestis