Plague is an infectious disease of humans,and rodentsBubonic plague is one form of plague. Bubonic plague is caused by bacteria called Yersinia pestis. These bacteria are found mainly in rodents, particularly rats, and in the fleas that feed on them. Other animals and humans usually contract the bacteria from rodent or flea bites. Usually, bubonic plague is spread by being bitten by an infected flea or rodent. In rare cases, Yersinia pestis bacteria that is present on a piece of contaminated clothing or other material used by an infected person may enter through an opening in the skin. The bacteria are rarely spread from person to person. When a person becomes infected with the bacteria that cause bubonic plague, the bacteria begin to multiply within the lymph system. After two to six days; symptoms of bubonic plague can begin. The period between becoming infected and the start of symptoms is called the incubation period. The symptoms were not the same as in the East, where a gush of blood from the nose was the plain sign of inevitable death; but it began both in men and women with certain swellings in the groin or under the armpit. They grew to the size of a small apple or an egg, more or less, and were vulgarly called tumours. In a short space of time these tumours spread from the two parts named all over the body. Soon after this the symptoms changed and black or purple spots appeared on the arms or thighs or any other part of the body, sometimes a few large ones, sometimes many little ones. These spots were a certain sign of death, just as the original tumour had been and still remained. No doctor's advice, no