Pestis bubonica, commonly known as the bubonic plague, is a disease caused by the bacterium Yersinia pestis. It is one of the most infamous diseases in human history, causing devastating pandemics throughout history. Synonyms for pestis bubonica include Black Death, Plague, Great Mortality, and Black Plague. The disease is transmitted through the bites of infected fleas that live on rodents such as rats. Symptoms of the plague include fever, chills, muscle aches, and swollen lymph nodes, which can progress to septicemia and pneumonia, leading to death. Thanks to modern medicine, the bubonic plague is now treatable with antibiotics, and only a few cases are reported each year.