Infectious Diseases, Explained

Caused by bacteria, viruses, fungi, and other organisms, infectious diseases range from mild to life-threatening. They can be spread from person to person, transmitted by insects or animals, or picked up through contaminated food. Many can be prevented with vaccines.

Featured Stories

More Infectious Diseases

What Is Toxic Positivity—and Why Are Experts Saying It's Dangerous Right Now?

Striving to stay upbeat and optimistic during a life-altering global pandemic can backfire.