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Transient Hypogammaglobulinemia of Infancy: Differential Diagnoses & Workup
Updated: Jun 20, 2008
- Overview
- Differential Diagnoses & Workup
- Treatment & Medication
- Follow-up
Differential Diagnoses
Agammaglobulinemia
Bruton Agammaglobulinemia
Common Variable Immunodeficiency
IgA and IgG Subclass Deficiencies
Protein-Losing Enteropathy
Severe Combined Immunodeficiency
Other Problems to Be Considered
X-linked agammaglobulinemia
B-linked agammaglobulinemia
Hyper-IgM syndrome
Selective IgA deficiency
Antibody deficiency with normal serum immunoglobulins
Secondary immunodeficiency due to loss of IgG and IgA
Workup
Laboratory Studies
- In evaluating transient hypergammaglobulinemia of infancy (THI), serum IgG levels are decreased less than 2 SDs for age-adjusted reference range levels. Often, serum IgA levels are also decreased; however, IgM levels are typically within the reference range. Flow cytometry studies reveal that the percentages and numbers of CD3+ and especially CD4+ T cells may be slightly decreased but are typically normal. T-cell function assessed by delayed type hypersensitivity (DTH) and in vitro lymphoproliferative responses are normal. Percentages and numbers of CD19+ B cells may be increased; however, in the author's experience, CD27+ memory and CD27+IgD-IgM- switched B cells may be decreased.
- Antibody titers to protein immunizations (eg, tetanus toxoid, diphtheria toxoid, polio) are at normal or near-normal concentrations. This distinguishes THI from more serious B- and T-cell immunodeficiency disorders. However, antibody responses to viral respiratory infections may also be decreased. Furthermore, Dalal and Roifman (2001) reported that antibody responses following immunization may be normal but may not persist on serial determinations.6
- In contrast to responses to protein antigens, antibody responses to polysaccharide antigens are often abnormal. In children with THI older than 2 years, Wolpert and Knutsen (1998) observed poor antibody responses to the unconjugated pneumococcal vaccine (Pneumovax); in children with THI younger than 2 years, poor antibody response to the conjugated-pneumococcal vaccine (Prevnar) was observed.11 Dorsey et al (2006) reported that immunizations to conjugated polysaccharide antigens are often subnormal in children with THI.1 These authors observed decreased antibody responses to both conjugated H influenzae type B vaccine and S pneumoniae immunization in children with THI.
- The serum immunoglobulin pattern of decreased IgG and IgA levels resembles X-linked hyper-IgM (XL-HIGM type 1) syndrome, autosomal recessive CD40 deficiency HIGM (type 2), and common variable immunodeficiency. In HIGM and common variable immunodeficiency, mature B cells are present. In addition, memory and switched B cells are decreased in these conditions, which may be seen in THI as well. However, a severe antibody deficiency distinguishes these conditions from THI. Deficiency of T-cell CD40 ligand (gp39, CD154) is the genetic defect in XL-HIGM, and deficiency of B-cell CD40 is the genetic defect in HIGM type 3. CD40L and CD40 can be analyzed using flow cytometry.
- Deficiency of activation-induced cytidine deaminase (AID) and uracil-DNA glycosylase (UNG) in B cells has been associated with autosomal recessive forms of HIGM that affect B cells (HIGM type 2). Gene analysis of these defects in HIGM can be analyzed by commercial laboratories that specialize in genetic defects.
More on Transient Hypogammaglobulinemia of Infancy |
| Overview: Transient Hypogammaglobulinemia of Infancy |
Differential Diagnoses & Workup: Transient Hypogammaglobulinemia of Infancy |
| Treatment & Medication: Transient Hypogammaglobulinemia of Infancy |
| Follow-up: Transient Hypogammaglobulinemia of Infancy |
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References
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Further Reading
Keywords
transient hypogammaglobulinemia of infancy, THI, decreased immunoglobulin A, IgA, decreased immunoglobulin G, IgG, immunoglobulin M, IgM, common variable immunodeficiency, CVID, Bruton's agammaglobulinemia, hyper-IgM syndrome, HIGM, B-cell defect, dysgammaglobulinemia, upper respiratory tract infections, otitis media, sinusitis, pneumonia, severe combined immunodeficiency, SCID, bronchial infections, polysaccharide-encapsulated bacteria, varicella, oral candidiasis, sepsis, meningitis, food allergy, asthma, allergic rhinitis, acute lymphocytic leukemia, ALL, X-linked infantile agammaglobulinemia
Differential Diagnoses & Workup: Transient Hypogammaglobulinemia of Infancy