Cytomegalovirus (CMV)

Any of several herpes viruses (Herpesviridae) whose infection causes cellular enlargement and formation of eosinophilic inclusion bodies, especially in a cell’s nucleus; transmitted by sexual contact or exposure to infected body fluids; not highly contagious and occasionally produces mononucleosis-like symptoms in otherwise healthy adults, but acts as an opportunistic infectious agent in immunosuppressive conditions (such as AIDS).