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Disseminated cryptosporidium infection in an infant with hyper-IgM syndrome caused by CD40 deficiency

Necil Kutukculer1, Daniele Moratto, Yesim Aydinok

  • 1Department of Pediatrics, The Medical School, Ege University, Izmir, Turkey.

The Journal of Pediatrics
|February 14, 2003
PubMed

Insights

A rare genetic disorder, hyper-IgM syndrome due to CD40 deficiency, caused severe infections and failure to thrive in an infant. This condition impairs the immune system

Area of Science:

  • Immunology
  • Pediatrics
  • Genetics

Background:

  • Hyper-IgM syndrome is a group of primary immunodeficiencies characterized by defects in immunoglobulin class switching.
  • CD40 deficiency, an X-linked hyper-IgM syndrome, disrupts B-cell maturation and T-cell dependent immune responses.

Observation:

  • A male infant presented with severe respiratory infections, chronic diarrhea, and failure to thrive.
  • Disseminated Cryptosporidium parvum infection was identified, indicating profound immune compromise.

Findings:

  • Laboratory investigations confirmed hyper-IgM syndrome.
  • Genetic analysis revealed a deficiency in CD40, the underlying cause of the immune defect.

Implications:

  • This case highlights the critical role of CD40 in adaptive immunity and host defense against opportunistic pathogens.
  • Early diagnosis and management of CD40 deficiency are crucial for improving outcomes in affected infants.
  • Understanding this genetic defect provides insights into B-cell development and immune regulation.

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