It's Catching by Presents general information about different types of germs, as well as the diseases they cause, and how people work to prevent them from spreading.
Those Mean Nasty Dirty Downright Disgusting but... Invisible Germs by A little girl, who accumulates germs on her hands during her busy day, defeats them by washing her hands before meals.
Germs by "Introduces young readers to the world of good and bad bacteria: germs"-- Provided by publisher.