Varicella Zoster Say: vair-uh-seh-luh zos-ter This is the medical name for the virus that causes chicken pox, which is known for its red, itchy bumps. Lots of kids get chicken pox, but now there's a shot that can help prevent this itchy illness. 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.