WORLD HISTORY

Detailed explanation-1: -The bacterium that causes the bubonic plague is called yersinia pestis. It can survive in rodent populations and is spread to other mammals, including humans, through flea bites. The point of origin for the Black Death was most likely a population of marmots-small, prairie-dog like rodents-in Central Asia.

Detailed explanation-2: -Bubonic plague is an infection spread mostly to humans by infected fleas that travel on rodents. Called the Black Death, it killed millions of Europeans during the Middle Ages.

Detailed explanation-3: -Paul-Louis Simond and his discovery of plague transmission by rat fleas: a centenary.-PMC.

Detailed explanation-4: -Modern research has suggested that, over that period of time, plague was introduced into Europe multiple times, coming along trade routes in waves from Central Asia as a result of climate fluctuations that affected populations of rodents infested with plague-carrying fleas.

Detailed explanation-5: -Flea. Though historically rats have been blamed for the spread of the bubonic plague in the medieval pandemic of the Black Death, it was in fact the humble flea that spread this bacterial infection to humans and animals alike.