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Escherichia coli antibody: a screening test for immunodeficiency
British Medical Journal
|July 6, 1974
Summary
Patients lacking antibodies to Escherichia coli (E. coli) may have an antibody production defect. Gammaglobulin therapy improved five of six patients with recurrent infections, suggesting a useful diagnostic screening test.
Area of Science:
- Immunology
- Microbiology
Background:
- Recurrent chest infections can indicate underlying immune system dysfunction.
- Commensal Escherichia coli (E. coli) are common bacteria, and antibodies against them are typically present.
Purpose of the Study:
- To investigate the role of E. coli antibodies in patients with recurrent chest infections.
- To assess the diagnostic utility of detecting E. coli antibodies in immunodeficiency disorders.
Main Methods:
- Assessed antibody levels against pooled antigens from six E. coli serotypes in patients with recurrent chest infections.
- Monitored serum IgG concentrations and response to gammaglobulin therapy.
Main Results:
- Six patients lacked antibodies to the pooled E. coli antigen.
- All patients had normal serum IgG levels.
- Five of the six patients showed clinical improvement after regular gammaglobulin injections.
Conclusions:
- Absence of E. coli antibodies suggests a clinically significant antibody production defect.
- This antibody screening test aids in diagnosing primary and secondary immunodeficiency disorders.