Bubonic plague has been a major epidemic in the world since ancient times. There is a record of plague epidemic in Athens in 430 B.C. In a plague epidemic in Rome in 262 A.D. nearly 5,000 people died daily.
I am not aware about different theories that may have circulated in the past about cause of bubonic plague. However, in 1907 it was well proven that rat fleas carry this disease, and since then it has been possible to control it with campaigns to control rats.
Bubonic and other forms of plague is caused by germs called yersenina pesis which is transmitted to human beings chiefly by rat fleas from infected rats. The rats used to spread plague from place to place in ships and trains. Once human beings are infected with plague, they can infect other people also.
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