How is Doctor Yersin connected to bubonic plague?

Alexandre Emile Jean Yersin (September 22, 1863 – March 1, 1943), also known in Vietnamese as Alexandre Yersin, was a Swiss-French physician and bacteriologist who discovered the bacterium, Yersinia pestis, which causes the disease bubonic plague, in 1894.

In the late 19th century, during a plague outbreak in Hong Kong, Yersin was part of a team sent to study the disease. There, he worked closely with the French bacteriologist Paul-Louis Simond.

Working in the makeshift laboratory set up in a Chinese temple, Yersin successfully isolated the bacterium responsible for the plague, which he named Bacillus pestis. He also demonstrated the flea’s role in transmission. Yersin’s findings revolutionised the understanding and treatment of the disease and laid the groundwork for the development of vaccines and antibiotics.