Infectious mononucleosis.
D000380:Agranulocytosis / Q000209:etiology; D002675:Child, Preschool; D006801:Humans; D007244:Infectious Mononucleosis / Q000150:complications*; D008297:Male; D012202:Reye Syndrome / Q000209:etiology; D012772:Shock, Septic / Q000209:etiology