Immunofluorescence testing for EBV shows anti-VCA, anti-EA, and anti-EBNA antibodies. How would this be interpreted?

Immunofluorescence testing for EBV shows anti-VCA, anti-EA, and anti-EBNA antibodies. How would this be interpreted?

• A. Past infection with EBV
• B. Acute primary EBV infection
• C. Current EBV reactivation
• D. No EBV exposure

Answer: (A)

In EBV serology, the antibodies tell you about the timing of infection. EBNA antibodies develop after the initial infection and persist for life, so their presence is a reliable mark of a past EBV infection. Anti-VCA antibodies can appear early and also persist, which shows exposure at some point. Anti-EA indicates active viral replication and is often seen during reactivation or an active infection, but it doesn’t override the significance of EBNA being present. So when you see anti-VCA, anti-EA, and anti-EBNA together, you interpret it as a prior EBV infection, with the possibility of reactivation indicated by EA, rather than a new, primary acute infection. A true acute primary infection would more typically show VCA IgM with EBNA negative.

In EBV serology, the antibodies tell you about the timing of infection. EBNA antibodies develop after the initial infection and persist for life, so their presence is a reliable mark of a past EBV infection. Anti-VCA antibodies can appear early and also persist, which shows exposure at some point. Anti-EA indicates active viral replication and is often seen during reactivation or an active infection, but it doesn’t override the significance of EBNA being present. So when you see anti-VCA, anti-EA, and anti-EBNA together, you interpret it as a prior EBV infection, with the possibility of reactivation indicated by EA, rather than a new, primary acute infection. A true acute primary infection would more typically show VCA IgM with EBNA negative.