IN THIS ARTICLE
The Epstein-Barr virus causes mononucleosis in the majority of cases. This ubiquitous, highly contagious organism is a member of the Herpesviridae family of viruses (other viruses in this family include herpes simplex, varicella-zoster, cytomegalovirus, and human herpes virus 6 & 7). Cytomegalovirus (CMV) can sometimes also cause an illness with the symptoms of mononucleosis.
Medically Reviewed by a Doctor on 8/31/2015
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