The Germ Patrol: All About Shots for Tots...... and Big Kids, Too! Paperback – April 23, 1998 by Neil B. Shulman (Author), Todd Stolp  (Author, Illustrator), Robin Voss
 
When Trudy tries to hide in her tree house to avoid her appointment to get vaccinated, her sprightly Grandmother finds her and explains the importance of vaccines. Then Super Nurse parachutes into her hideout and takes Trudy on a tour to explain how vaccines work inside her body. The immune system is the law enforcement (AKA the Germ Patrol), germs are the bad guys, and the vaccines are wanted-posters that tell the Germ Patrol what the bad guys look like. In the end, the whole town turns out to celebrate Trudy s bravery as she gets vaccinated.
 
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