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Meningococcal carriage and immunity in western Burkina Faso, 2003

Seydou Yaro1, Yves Traoré, Zekiba Tarnagda

  • 1Centre Muraz, Bobo-Dioulasso, Burkina Faso.

Vaccine
|June 15, 2007
PubMed

Insights

In Burkina Faso, Neisseria meningitidis serogroup W135 (NmW135) carriage did not induce protective immunity. A vaccine against NmW135 is needed to prevent meningitis in sub-Saharan Africa.

Area of Science:

  • * Infectious Disease Epidemiology
  • * Microbiology
  • * Immunology

Background:

  • * The 2003 meningitis season in Burkina Faso saw high rates of Neisseria meningitidis serogroup W135 (NmW135) and serogroup A (NmA) disease.
  • * Understanding carriage and immune response is crucial for meningitis control.

Purpose of the Study:

  • * To assess the relationship between Neisseria meningitidis serogroup W135 (NmW135) carriage and immune markers.
  • * To evaluate the immunogenicity of NmW135 carriage in a population recently vaccinated against serogroup A.

Main Methods:

  • * Prospective carriage and serological study in Burkina Faso.
  • * Monthly evaluations of participants over five months.
  • * Measurement of specific immunoglobulin G (IgG) and serum bactericidal antibody (SBA) titers.

Main Results:

  • * Moderate NmW135 carriage was associated with low levels of protective antibodies (IgG and SBA) against NmW135.
  • * Recently vaccinated individuals showed high IgG and SBA titers against NmA, with no NmA carriage detected.
  • * NmW135 carriage rarely induced protective immunity, and natural immunity waned quickly.

Conclusions:

  • * Natural immunity against NmW135 is not reliably induced or sustained by carriage.
  • * A vaccine effective against NmW135 is essential for meningitis prevention in sub-Saharan Africa.

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