Have you ever seen a germ up close? Really, really close? Award-winning science writer Sara Levine introduces readers to a variety of viruses, bacteria, protozoa, and fungi that can make people sick―including SARS-CoV-2, E. coli, and ringworm. Micrographs and illustrations show extremely close-up views of the germs that are at once incredible and a little gross.

The book concludes with tips for staying healthy as well as information about the immune system, vaccines, and medicines. It gives readers accessible, up-to-date scientific information presented in a way that emphasizes curiosity rather than fear.