Editing Infectious mononucleosis (section)

===Epstein–Barr virus===
{{Main|Epstein–Barr virus}}
About 90% of cases of infectious mononucleosis are caused by the [[Epstein–Barr virus]], a member of the [[Herpesviridae]] family of [[DNA viruses]]. It is one of the most commonly found [[viruses]] throughout the world. Contrary to common belief, the Epstein–Barr virus is not highly contagious. It can only be contracted through direct contact with an infected person's [[saliva]], such as through kissing or sharing toothbrushes.<ref>[http://www.mayoclinic.com/health/mononucleosis/AN00661 Mononucleosis and Epstein-Barr: What's the connection?] {{webarchive|url=https://web.archive.org/web/20130606232054/http://www.mayoclinic.com/health/mononucleosis/AN00661 |date=2013-06-06 }}. MayoClinic.com (2011-11-22). Retrieved on 2013-08-03.</ref> About 95% of the population has been exposed to this virus by the age of 40, but only 15–20% of teenagers and about 40% of exposed adults actually develop infectious mononucleosis.<ref>Schonbeck, John and Frey, Rebecca. ''The Gale Encyclopedia of Medicine.'' Vol. 2. 4th ed.  Detroit: Gale, 2011. Online.</ref>