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IgG2 immunodeficiency: association to pediatric patients with bacterial meningoencephalitis
X Escobar-Pérez1, A J Dorta-Contreras, M T Interián-Morales
1Laboratorio de Inmunología, Hospital Psiquiátrico San Miguel del Padrón, Ciudad Habana, Cuba.
Abstract:
An IgG subclass deficiency is often associated with bacterial infections. We studied four pediatric patients suffering from meningoencephalitis, two of them due to Streptococcus pneumoniae and two due to Haemophilus influenzae type b. Simultaneous diagnostic serum and cerebrospinal fluid samples were taken during income. The four subclasses of IgG and albumin were quantified in both biologic fluids by radial immunodiffusion. Very low levels of seric IgG2 with non detectable cerebrospinal fluid IgG2 were found in the patients. No intrathecal IgG subclass synthesis was found in two patients. One patient with S. pneumoniae had IgG3 intrathecal synthesis. Intrathecal IgG1, IgG3 and IgG4 synthesis was found in one patient suffering from H. influenzae according with reibergrams. Substitutive therapy with intravenous gammaglobulin was given to the patients as part of the treatment.
Insights
Pediatric patients with meningoencephalitis often show immunoglobulin G2 (IgG2) deficiency, impacting their ability to fight bacterial infections like Streptococcus pneumoniae and Haemophilus influenzae type b.
Area of Science:
- Immunology
- Neurology
- Pediatrics
Background:
- Immunoglobulin G (IgG) subclass deficiencies are linked to recurrent bacterial infections.
- Meningoencephalitis in children can be caused by bacteria such as Streptococcus pneumoniae and Haemophilus influenzae type b.
Observation:
- Four pediatric patients with bacterial meningoencephalitis were analyzed.
- Serum and cerebrospinal fluid samples were collected for IgG subclass and albumin quantification.
- Radial immunodiffusion was used to measure IgG subclasses and albumin levels.
Findings:
- All patients exhibited very low serum IgG2 levels and undetectable cerebrospinal fluid IgG2.
- Intrathecal IgG subclass synthesis varied among patients, with some showing no synthesis, while others demonstrated IgG1, IgG3, and IgG4 synthesis.
- Specific patterns of intrathecal synthesis were observed in relation to the causative pathogen and Reibergrams.
Implications:
- IgG2 deficiency may be a significant factor in pediatric susceptibility to severe bacterial meningoencephalitis.
- Understanding IgG subclass profiles and intrathecal synthesis is crucial for diagnosing and managing these complex infections.
- Intravenous immunoglobulin therapy may be a beneficial treatment option for affected children.