Medical Encyclopedia

Mononucleosis, photomicrograph of cells

This is a lymphocyte that has been infected by the Epstein-Barr Virus(EBV) or Cytomegalovirus (CMV) in infectious mononucleosis and is referred to as a "Downy cell".Downy cells may be classified as types I, II, or III; this is a type I Downy cell.