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Epstein-Barr virus
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== Diagnosis == EBV infection is confirmed with blood tests that detect presence of [[:Category:Antibodies|antibodies]]. Nine out of ten adults have these antibodies, indicating that they have a current or past EBV infection.<ref name="CDC" /> Anti-VCA (Viral capsid antigen) IgG and EBV nuclear antigen (EBNA) IgG antibodies persist throughout a person's life. Thus, positive results merely indicate a current or past infection. A current EBV infection is diagnosed based on the presence of Anti-VCA IgM and Anti-EA (Early Antigen) IgG. VCA IgM appears early in EBV infection and usually disappears within four to six weeks. Positive VCA IgM suggests current active acute EBV infection. EA IgG appears in the acute phase of illness and generally falls to undetectable levels after three to six months. Positive EA IgG can suggest current active EBV infection or EBV re-activation. <ref name="CDC-testing">{{Cite web | url=https://www.cdc.gov/epstein-barr/laboratory-testing.html | title = Epstein-barr {{!}} Mononucleosis {{!}} Laboratory Testing {{!}} Mono | date = 2019-01-28 | website = [[Centers for Disease Control and Prevention]]|language=en-us|access-date=2020-10-08}}</ref>
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