How do you get mono?

Saliva: Infectious mononucleosis (mono) is often called kissing disease. Virus causing mono is transmitted through saliva, so you can get it through kissing, but you can also be exposed through a cough or sneeze, or 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.