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Bacterial meningitis in Navojo Indians
Abstract:
An analysis of 219 confirmed cases of bacterial meningitis among Navajo Indians during a 5-year period, July 1, 1968, through June 30, 1973, revealed that 56 percent were caused by Haemophilus influenzae, 26 percent by Neisseria meningitidis, 6 percent by Mycobacterium tuberculosis, and 6 percent by other organisms. The annual incidence of H. influenzae meningitis (17.7 per 100,000 persons) and that of pneumococcal meningitis (8.0 per 100,000) were much higher than the rates for these diseases reported from other population groups. The annual incidence of meningococcal meningitis (2.0 per 100,000) was similar to that found elsewhere. There was an ususual concentration of cases during the first year of life; 78 percent of H. influenzae, 64 percent of pneumococcal, and 50 percent of meningococcal meningitis occurred during this time. However, bacterial meningitis during the first month of life was not frequent (0.29 per 1,000 live births). Case fatality rates were similar to those reported for other population groups.
Insights
Bacterial meningitis, particularly Haemophilus influenzae, was highly prevalent among Navajo Indians from 1968-1973, especially in infants. Case fatality rates were comparable to other populations.
Area of Science:
- Epidemiology
- Infectious Diseases
- Pediatrics
Background:
- Bacterial meningitis poses a significant public health challenge, with varying incidence and causative agents across different populations.
- Understanding the epidemiology of meningitis in specific demographic groups is crucial for targeted prevention and treatment strategies.
Purpose of the Study:
- To analyze the incidence, causative agents, and age distribution of bacterial meningitis among Navajo Indians.
- To compare these findings with national data and assess case fatality rates.
Main Methods:
- Retrospective analysis of 219 confirmed bacterial meningitis cases in Navajo Indians over a 5-year period (1968-1973).
- Identification of causative organisms, including Haemophilus influenzae, Neisseria meningitidis, and Mycobacterium tuberculosis.
- Calculation of annual incidence rates per 100,000 persons and per 1,000 live births.
Main Results:
- Haemophilus influenzae (56%) was the leading cause of bacterial meningitis, followed by Neisseria meningitidis (26%).
- Annual incidence of H. influenzae and pneumococcal meningitis were significantly higher in this population compared to others.
- A notable concentration of cases occurred within the first year of life, particularly for H. influenzae meningitis.
Conclusions:
- Haemophilus influenzae meningitis presented a disproportionately high burden among Navajo infants during the study period.
- While incidence rates for H. influenzae and pneumococcal meningitis were elevated, meningococcal meningitis rates were similar to other groups.
- Case fatality rates for bacterial meningitis were consistent with those reported in other populations.