Mononucleosis infectious (a glandular fever, a monocytic angina) - the virus infectious disease, described transformation of lymphocytes, occurrence of these original cells in the Peripheric blood, a reactive lymphadenitis, a hyperadenosis, liens. In a basis of disease transformation of the lymphocytes caused by a specific virus infection.

The clinical picture is various. In easy cases - disturbances of state of health in connection with a rhinitis. Typical signs: an angina (« glowing fauces »), difficulty of nasal respiration in the first days of illness due to an edema of a mucosa, augmentation and morbidity of back cervical lymph nodes (it is frequent lymph nodes and other groups), augmentation of a lien. Duration of illness - some weeks, but in some cases normalization of a picture of a blood is tightened for months. Relapses - with easier current, sometimes with intervals in some years after the first acute period are observed also.