Epstein-Barr viruses, EBV. Transmission electron micrograph of Epstein-Barr viruses in Burkitt's lymphoma, seen as circles with central, dark staining nucleic acid (DNA). EBV, also known as human herpes virus 4, is 1 of 5 herpes viruses that attacks humans. In Europe & US infection may produce glandular fever; in Central Africa EBV infection may lead to Burkitt's lymphoma (a facial cancer in children). In both infections, the virus infects one type of white blood cell, the B lymphocytes. Infection with EBV is common & usually harmless; additional factors potentiate the development of more serious diseases. Magnification: x337,500 at 8x10 inch size.