<prompt> EBV action in nasopharynx is through?CD 3Cd 4CD 8CD 21  <response>: Ans. is d i.e., CD 21 Epstein - Barr Virus EBV Belongs to Herpes viruses family. Infection is most common in early childhood, with a second peak during late adolescence. Infectious mononucleosis IM is usually a disease of young adults. EBV is transmitted by saliva oral secretions of infected person. Intimate oral contact, as in kissing is the predominant mode of transmission causes kissing disease. The virus enter the pharyngeal epithelial cells and B cells through CR 2 or CD21 receptors. Memory B Cells are the reservoir of EBV. 