Virus Say: vy-rus 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. Back to Articles Related Articles Note: All information is for educational purposes only. For specific medical advice, diagnoses, and treatment, consult your doctor. © 1995-2021 KidsHealth®. All rights reserved. Images provided by The Nemours Foundation, iStock, Getty Images, Veer, Shutterstock, and Clipart.com.