ABSTRACT
Infectious mononucleosis (IM) is an acute viral infection that usually occurs with fever, acute tonsillitis, affects lymph nodes, liver, spleen, and with specific changes in the hemogram. One of the most frequent symptoms of the disease is sore throat which leads people to otorhinolaryngologist. Several pathogens may be the cause of IM, but Epstein-Barr virus(EBV) plays a key role. EBV is a γ-herpes virus and about 90% of world`s population is infected with this one. Severe IM can lead to potential life-threating conditions, for example upper airway obstruction, spleen rupture. In addition to acute IM, EBV-infection can lead to a number of neoplastic and autoimmune diseases. Due to the non-specificity of IM symptoms and the emerging difficulties in laboratory and serological diagnosis of this disease, the problem of timely diagnosis and treatment in this category of patients remains very relevant.