You see what happened was the fleas on rodents carried a disease that made black sores that filled with blood and puss all over your body. The plague also made you vomit and also put gangreen all over your body
You see when the black death was a thing the medicine wasnt as advaced as it is now so doctors thought that it was transmitted by smell so they put flowers and herbs in their masks to try and prevent it
Because the jewish community had better hygiene than the townfolk and didnt get the plague as often , The townsfolk believed that they poisoned the wells they drank from. They killed a lot of innocent people because of some misleading accusations
Now you understand that now because we have many good scientists and people working in the medical field we are a lot safer than our ancestors and its not as bad now as you thought it was