Overview

Infectious mononucleosis (mono) is often called the kissing disease. The virus that causes mono (Epstein-Barr virus) is spread through saliva. You can get it through kissing, but you can also be exposed by sharing a glass or food utensils with someone who has mono. However, mononucleosis isn't as contagious as some infections, such as the common cold.

You're most likely to get mononucleosis with all the signs and symptoms if you're a teen or young adult. Young children usually have few symptoms, and the infection often goes undiagnosed.

If you have mononucleosis, it's important to be careful of certain complications such as an enlarged spleen. Rest and enough fluids are keys to recovery.