The Black Death came in three forms and was transmitted two ways. All forms were caused by a bacteria called Yersinia Pestis. The Septicemic and Bubonic plague was transmitted with the bite of a diseased flea. The Pneumonic Plague was transmitted through the saliva coughed up by the humans with the septicemic or Bubonic Plague. The Black Death got its name because if the black/purple bumps humans would get as a result of having the disease. (To the right)