The Bubonic Plague began is said to have began in 1347. As medicine was not advanced, over 25 million people died. Although the bubonic plague is found mostly in small rodents and is transmitted to humans through fleas. Once caught, the plague is very contagious and killed quickly. Symptoms include fever, chills, weakness, and headache. This information is from the CDC and www.themiddleages.net. This photo is from Wikimedia Commons and is free to share.