Tiny invaders!
"Describes microscopic organisms that can cause illness and disease, including bacteria, viruses, protozoa, and fungi"--
BacteriaJuvenile literatureVirusesMicroorganismsJUVENILE NONFICTIONScience & NatureBiologyAnimalsInsects, SpidersViruses, juvenile literatureMicroorganisms, juvenile literatureBacteria, juvenile literature