When a rhinovirus, the virus that causes the common cold, lands on a little girl, it explains how it spreads throughout the body until the white blood cells appear. They release a chemical that causes blood vessels in the girl's nose to expand, giving her a runny nose, and work to destroy the virus. The girl is too sick to go to school and eats soup to help get rid of the virus. The virus explains how some viruses have been eliminated through vaccines and introduces COVID-19 and how vaccines are being used to fight back against it. Includes a glossary and additional resources.