The bubonic plague, also called the black death, killed about 200 million people in the 1300s. the disease is caused by a bacterium, and it still persists in some areas of the world. research the bubonic plague using credible websites and explain the role microbiologists play in researching and treating the disease.

At the end of the 19th century, The French biologist Alexandre Yersin discovered the germ Yersina pestis. Yersina pestis spread the "Black Death". With the help of modern microbiologist's study with a namatode (C. elegans), genes that may play a part in the transmission of plague have been identified. Along with this knowledge, the microbiologists understood that the bacillus travelled from person to person through the air and from bites from infected fleas and rats. According to biologist Paul-Louis Simond, the bacteria blocks the digestive tracts of the fleas and stimulates them to bite and people repeatedly, injecting and spreading the bacteria. The bacteria hitchhike in immune cells in lymph nodes and the infection begins and transmits to others. Antibiotics are then chosen to fight the bacteria.

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