WORLD HISTORY

Detailed explanation-1: -Plague is an infectious disease caused by the bacteria Yersinia pestis, a zoonotic bacteria, usually found in small mammals and their fleas. It is transmitted between animals through fleas. Humans can be infected through: the bite of infected vector fleas.

Detailed explanation-2: -Plague is a disease that affects humans and other mammals. It is caused by the bacterium, Yersinia pestis. Humans usually get plague after being bitten by a rodent flea that is carrying the plague bacterium or by handling an animal infected with plague.

Detailed explanation-3: -Plague (Yersinia pestis) Plague is a disease caused by Yersinia pestis, an anaerobic, gram-negative bacterium. The natural host for this organism is a rat and the disease is usually transmitted to humans through a flea bite from a flea that has fed on an infected rat and then on a human.

Detailed explanation-4: -When bubonic plague is left untreated, plague bacteria can invade the bloodstream. When plague bacteria multiply in the bloodstream, they spread rapidly throughout the body and cause a severe and often fatal condition called septicemic plague.

Detailed explanation-5: -The organism that causes plague, Yersinia pestis, lives in small rodents found most commonly in rural and semirural areas of Africa, Asia and the United States. The organism is transmitted to humans who are bitten by fleas that have fed on infected rodents or by humans handling infected animals.