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The epidemiology of bacterial meningitis

A D Walling1, K J Kallail, D Phillips

  • 1Department of Family and Community Medicine, University of Kansas School of Medicine-Wichita 67214-3199.

The Journal of the American Board of Family Practice
|September 1, 1991
PubMed
Abstract

Insights

Bacterial meningitis incidence varies by age, with children under 5 most affected. Significant declines in childhood bacterial meningitis and Haemophilus influenzae cases have been observed.

Area of Science:

  • Epidemiology
  • Infectious Diseases
  • Public Health

Background:

  • Community-level incidence and causative organisms of bacterial meningitis were previously unknown.
  • Understanding age-specific risks and common pathogens is crucial for public health interventions.

Purpose of the Study:

  • To determine the community-based incidence and age distribution of bacterial meningitis.
  • To identify the predominant causative organisms and their age-related patterns.
  • To assess case fatality rates associated with different pathogens and age groups.

Main Methods:

  • A retrospective epidemiological study of bacterial meningitis cases admitted to hospitals in a metropolitan county.
  • Data collection spanned from 1983 to 1987, covering a five-year period.
  • Analysis included incidence rates by age, causative organism identification, and case fatality rates.

Main Results:

  • Overall bacterial meningitis incidence was 5 per 100,000 person-years.
  • Children under 5 years had the highest incidence (40 per 100,000), while adults aged 16-64 had the lowest (1.0 per 100,000).
  • Haemophilus influenzae was the most common organism overall, followed by Streptococcus pneumoniae (32%). Case fatality rates were high for S. pneumoniae (12.5%) and elderly patients.

Conclusions:

  • Bacterial meningitis incidence has significantly decreased in the last decade, especially in children under 5.
  • Reductions were particularly noted for diseases caused by Haemophilus influenzae and group B Streptococcus.
  • Ongoing surveillance is essential to monitor trends and guide prevention strategies.

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