This informative series introduces readers to different types of germs and the ways their bodies fight back. Text, charts, and colorful imagery explore how germs invade the body, replicate, and spread to other people. Compact, easy-to-read chapters describe how the immune system battles germs, symptoms of common illnesses, complications, and when to seek medical help. Each title includes simple everyday habits to keep healthy. Aligned to Common Core Standards and correlated to state standards. Big Buddy Books is an imprint of Abdo Publishing, a division of ABDO.