Skip to contentSkip to navigation
COVID-19: We are open. Some services are modified. Mask is mandatory. Details at

VCA IgM, Anti-Epstein-Barr Virus Viral-Capsid Antigen IgM


EBNA IgG and VCA IgM (anti-Epstein-Barr virus capsid antigen IgM) are two types of antibodies produced by the body against the Epstein-Barr virus (EBV), which is responsible for mononucleosis. EBNA IgG is directed against an antigen of the virus nucleus (Epstein Barr nuclear antigen), while the VCA IgM is directed against an element of the envelope (capsid) of the virus (viral-capsid antigen). When a person is infected with EBV, VCA IgM appears first and disappears within 4 to 6 weeks. EBNA IgG test results are positive within a few months, usually after symptoms have disappeared, and remain positive for life.

Term of the Week

Hot zone

A hot zone is a section of a facility (sometimes an entire facility or even a city district) where there is a high risk of contamination by patients with an infectious disease. All individuals entering a hot zone must respect appropriate protective measures. By analogy, “cold zone” and “warm zone” are used to refer to areas where there is no infected individual or only individuals suspected of having an infection.