Infectious Mononucleosis - Causes
The EBV that causes mononucleosis is related to the herpes viruses (see herpes infections entry). The herpes viruses are responsible for infectious diseases such as cold sores, chickenpox (see chickenpox entry), and shingles. Most people are exposed to EBV at some point in their lives. The virus is spread through contact with saliva from an infected person. It can be transferred by coughing, sneezing, kissing, or sharing of drinking glasses or eating utensils.

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