(En español: Virus)
Viruses are a type of germ. They're very tiny, and when they get inside your body, they can make you sick. Viruses cause colds, chicken pox, measles, flu, and many other diseases. Unfortunately, antibiotics don't work on viruses like they do on bacteria. Wash your hands often to help prevent the spread of viruses, especially before you eat and after you use the bathroom.