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Indications for the immunological evaluation of patients with meningitis
1Department of Pediatrics and Pathology, Division of Pediatric Infectious Diseases, University of New Mexico Health Sciences Center, Albuquerque, NM 87131, USA. goverturf@salud.unm.edu
Abstract:
Although people with bacterial meningitis lack adequate protective antibody against the invading pathogen, most do not have an underlying immunodeficiency. Certain comorbid conditions increase the risk for development of bacterial sepsis and meningitis. In addition, certain congenital complement deficiencies, defects of antibody production, or asplenia may be first recognized by the occurrence of bacterial meningitis, particularly when it occurs in infants or young children. Deficiencies of the terminal components of complement (C5-C9) or properdin have been associated with recurrent or invasive neisserial infections, and asplenia, agammaglobulinemia, and deficiencies of the early components of complement (e.g., C1-C3) are associated with risks of infections caused by Streptococcus pneumoniae, Haemophilus influenzae, and meningococci. The presence of congenital or acquired immunodeficiencies should be considered in persons who present with bacterial meningitis on the basis of the etiology, clinical epidemiology, and presence of other risk factors.
Insights
Most bacterial meningitis cases occur without underlying immunodeficiency. However, certain conditions like complement deficiencies or asplenia increase risk, especially in children, warranting consideration of immunodeficiencies.
Area of Science:
- Immunology
- Infectious Diseases
- Pediatrics
Background:
- Bacterial meningitis often occurs without apparent immunodeficiency.
- Comorbid conditions can elevate the risk of bacterial sepsis and meningitis.
- Congenital complement deficiencies, antibody production defects, or asplenia can be initial indicators of immune compromise, particularly in infants and children.
Purpose of the Study:
- To explore the role of immunodeficiencies in bacterial meningitis.
- To identify specific immune defects associated with increased risk of bacterial meningitis.
- To emphasize the importance of considering immunodeficiencies in meningitis cases.
Main Methods:
- Review of clinical epidemiology and risk factors for bacterial meningitis.
- Analysis of associations between specific complement deficiencies and pathogens.
- Evaluation of the significance of asplenia and antibody production defects.
Main Results:
- Deficiencies in terminal complement components (C5-C9) or properdin are linked to Neisserial infections.
- Asplenia, agammaglobulinemia, and early complement component deficiencies (C1-C3) increase susceptibility to Streptococcus pneumoniae, Haemophilus influenzae, and meningococci.
- Bacterial meningitis can be the first sign of congenital or acquired immunodeficiencies.
Conclusions:
- Immunodeficiencies should be considered in patients presenting with bacterial meningitis.
- Etiology, clinical epidemiology, and risk factors aid in identifying individuals with underlying immune defects.
- Prompt recognition of immunodeficiencies is crucial for managing and preventing recurrent bacterial meningitis.