Infectious mononucleosis and agranulocytosis

Area of Science:

• Hematology
• Pediatrics
• Infectious Diseases

Background:

• Infectious mononucleosis, a common viral illness, is known to cause various hematological abnormalities.
• Agranulocytosis, a severe reduction in granulocytes, is an exceptionally rare complication of infectious mononucleosis, leading to skepticism about a direct causal link.

Observation:

• This report details two young sisters, aged 3 and 5 years, who presented with agranulocytosis or profound granulocytopenia.
• The onset of this severe neutropenia occurred approximately 4-5 weeks after the acute phase of infectious mononucleosis in both children.

Findings:

• No other contributing factors or causes for the agranulocytosis were identified in either patient.
• The clinical presentation in siblings suggests a potential underlying genetic or constitutional susceptibility.

Implications:

• This case series highlights a rare but severe potential complication of infectious mononucleosis in children.
• The findings suggest that a constitutional predisposition may play a role in the development of agranulocytosis following infectious mononucleosis, warranting further investigation.