"COVID-19 is a disease caused by a virus called SARS-CoV2. Like all viruses, it is far too small to be seen by the naked eye. Yet this virus and the disease it caused had an enormous impact on the world. Understanding COVID-19 explores how the virus and the disease work, examining what made them so dangerous and what health officials learned about fighting them. Features include a glossary, references, websites, source notes, and an index." -- Provided by publisher.

Includes index.

Chapter one : A mysterious disease -- Chapter two : A new virus -- Chapter three : Symptoms and transmission -- Chapter four : Testing and treatment -- Fast facts -- Stop and think -- Glossary -- Online resources -- Learn more -- Index -- About the author.