It is caused by the bacteria Yersinia pestis. It was known as the Black Death in the 1300s, killing an estimated 20 to 30 million people in Europe. This strain of plague infects the lymphatic system and it becomes inflamed. Symptoms appear much more quickly than in the case of leprosy; within 3 to 7 days, people will begin to develop flu-like symptoms. However, like leprosy, bubonic plague can be treated with antibiotics. Of course, due to its fast-acting nature, early diagnosis and treatment are essential to help cure. Bubonic plague is rarely passed from person to person and is instead transmitted when a