Grade 5: Oh, Yuck!

http://www.amnh.org/ology/features/bacteria_in_the_cafeteria_game/

http://sciencenetlinks.com/student-teacher-sheets/whats-germ/

http://www.amnh.org/explore/ology/microbiology

https://web.archive.org/web/20130502012737/http://www.amnh.org/nationalcenter/infection/

http://kidshealth.org/en/kids/germs.html