Immunoglobulin isotypes and IgG subclasses in recurrent infections

Area of Science:

• Pediatric Immunology
• Clinical Immunology
• Infectious Diseases

Background:

• Recurrent infections in children are a significant clinical concern.
• Identifying underlying immune system deficiencies is crucial for effective management.
• Immunoglobulin (Ig) isotype and subclass deficiencies can predispose children to frequent infections.

Purpose of the Study:

• To investigate the prevalence of major immunoglobulin isotype and IgG subclass deficiencies.
• To assess the frequency of these deficiencies in children experiencing recurrent infections.

Main Methods:

• Studied 74 children aged six months to 14 years with recurrent infections.
• Assessed episodes of respiratory tract infections and recurrent diarrhea.
• Analyzed the frequency of specific IgA, IgG subclass (IgG1, IgG2, IgG3, IgG4), and panhypogammaglobulinemia.

Main Results:

• Detected two selective and six partial IgA deficiencies.
• Found isolated or combined IgG4, IgG3, and IgG2 deficiencies in 13, nine, and one patient, respectively.
• Identified various combined IgA and IgG subclass deficiencies, and one case of panhypogammaglobulinemia.

Conclusions:

• Immunoglobulin isotype and IgG subclass deficiencies are not uncommon in children with recurrent infections.
• The findings align with other studies indicating a significant association.
• Highlights the importance of evaluating immunoglobulin levels in pediatric patients with persistent infections.