[Primary immunodeficiency with hypogammaglobulinemia and minimum midline defect]

Area of Science:

• Immunology
• Allergy and Clinical Immunology
• Pediatrics

Background:

• Recurrent respiratory infections are common in allergic patients.
• Antibody deficiencies, including selective and polysaccharide-specific responses, are associated with these infections.
• Asthma and rhinitis are prevalent allergic conditions.

Purpose of the Study:

• To investigate antibody deficiency in an adolescent with recurrent infections despite asthma treatment.
• To highlight the association between allergic conditions and potential immunodeficiencies.
• To emphasize the importance of immunological workup in specific patient populations.

Main Methods:

• Case report of a male adolescent diagnosed with asthma and rhinitis.
• Evaluation included physical examination, complete blood count, immunoglobulin levels (IgA, IgM, IgG, IgE), and flow cytometry.
• Pneumococcal polysaccharide vaccine challenge was performed to assess specific antibody response.

Main Results:

• The patient presented with recurrent respiratory and gastrointestinal infections.
• Laboratory findings revealed low immunoglobulin A (IgA) and immunoglobulin M (IgM) levels.
• Impaired response to the pneumococcal polysaccharide vaccine was observed, with adequate response to only 4 serotypes.

Conclusions:

• Recurrent or invasive infections in patients with treated asthma warrant investigation for underlying antibody deficiency.
• Quantitative IgA and IgM deficiency, with impaired polysaccharide response, was identified in this adolescent.
• Immunological surveillance is crucial due to the potential progression to common variable immunodeficiency.