The article presents a case of the atypical sever course of infectious mononucleosis of mixed etiology (EBV, CMV, HHV-6). There were intoxication, fever, tonsillitis, lymphadenopathy, snoring and neutrophillosis with increase ESR detected in this case. At the same time, typical for IM rash, hepatomegaly, splenomegaly and mononuclear cells in blood were absent. That let us to conclude that persistence of several causative agent can alter content and character of typical manifestation of infectious mononucleosis in children.
