Alexandre Émile John Yersin was a Swiss-French physician and bacteriologist. He is remembered for his work as a pioneer in microbiology and immunology. Yersin is the co-discoverer of both the Diphther

The 1894 Hong Kong plague, part of the third plague pandemic, was a major outbreak of the bubonic plague in Hong Kong. While the plague was harshest in 1894, it returned annually between 1895 and 1929