The bubonic plague wreaked havoc in the fourteenth century. Learn about the germ that causes the illness, how fleas spread it, and how putting sailors in quarantine slowed the spread.Dive deep into the Deadly Diseases series—part of the UpDog Books™ collection. Discover what causes these illnesses, the symptoms behind them, and what is being done to stop the spread. At the end of the book, read two patients'' symptoms and decide which one has the sickness.