Mononucleosis (mono) is a viral infection caused by the Epstein-Barr virus (EBV). This virus is transmitted through infected saliva. This may happen by sharing a drinking glass, utensils, or food, or through coughing, sneezing, and kissing.
Despite common belief, mono is not very contagious. People in the same house rarely come down with it at the same time. It is more common in 15- to 25-year-olds. This may be because of more intimate or closer contact with others. For most people, the EBV infection usually occurs during infancy or childhood and without the typical signs of mono developing. Audio available.