<human>:  When does the Epstein-Barr Virus cause mononucleosis?
<bot>: The Epstein-Barr virus is a herpes virus that is usually found in the saliva of infected people. It is the most common cause of infectious mononucleosis. It is also known as mono, glandular fever, or the kissing disease. It is a very contagious virus that can be spread through saliva, kissing, and other close contact. It is most commonly spread through sexual contact, but can also be spread through blood, saliva, and other bodily fluids.