RUPTURE of the spleen in infectious mononucleosis is a rare complication of a rather common disease. King,1 in 1941, ... and a blood smear showed 63 per cent neutrophils, ...

Infectious Mononucleosis ... The doctor can be sure only after he has examined a blood smear. If he finds many cells of an abnormal type he has good evidence of the disease.

The blood counts of these residents, taken when they were ill or at the time of the survey, revealed no evidence suggesting that a diagnosis of infectious mononucleosis had been missed.