virus

A virus is like a tiny bad bug. It's very small, too small to see with your eyes, so we need a microscope to find it. Viruses can spread from person to person and make us very sick. They can make us cough and sneeze, give us feeling tired and achy, and make us feel feverish. Some viruses can make us so sick that we need a doctor to help us get better. We can protect ourselves from getting sick by washing our hands a lot and staying away from people who are sick.