Answer:
First you would get bitten by a flee, Then you would get a fever and start throwing up. After that you would find a large buboe (a large lump filled with blood & smelly black puss) under your arm. Then you would find blotches of bleeding from under the skin that caused a lot of pain. Soon after you would loose control of your body and have a spasm. The thing that told you that the fight to live was over was when your buboe popped and boy did they smell.
Then they would die...