Clinical and immunological features of specific antibody deficiency in a pediatric hospital in Colombia
Abstract
Introduction. Specific antibody deficiency is an innate error of humoral immunity characterized by normal levels of immunoglobulin isotypes, recurrent infections, and a reduced reaction to polysaccharide antigens in vaccines.
Objective. To describe the clinical and immunological characteristics of patients with specific antibody deficiency attending a pediatric hospital in Bogotá between May 2021 and September 2023.
Materials and methods. We reviewed the medical records of 16 patients with specific antibody deficiency.
Results. The median age at diagnosis was six and a half years. Nine were male, and 7 had a history of prematurity. Eleven patients had adequate nutritional status, and 7 had standard height. The most frequent recurrent infection was pneumonia, affecting 12 patients; more than half of them experienced some associated complications. The most common phenotype was moderate, and 15 of the individuals received immunoglobulin as definitive treatment.
Conclusion. Specific antibody deficiency is a frequently underdiagnosed functional alteration of the immune system. It should be suspected in patients experiencing recurrent otitis media and pneumonia or in cases complicated by septic shock, pleural effusion, or necrotizing pneumonia.
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References
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