Scientists and health-care workers around the world are battling COVID-19. Find out how the disease attacks the human body and see how people are fighting back. 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.