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Epidemiology of meningococcal meningitis in Angola, 1994-2000
Abstract:
We describe six meningococcal disease outbreaks that occurred in Angola during the period 1994-2000. In total, 7140 cases were documented. The age groups most affected were 15-29 years and 5-14 years; there were no differences in incidence between the sexes. Circulation of both serogroup A and sporadic serogroup B strains was demonstrated. Mass vaccination campaigns with A+C meningococcal polysaccharide vaccine were implemented, except in Yambala province in 1999 where insecure conditions precluded this intervention. Outbreaks of serogroup A meningococcal disease in Angola may indicate an extension of these epidemics outside the meningitis belt. Mass vaccination campaigns stopped the Angolan epidemics within weeks. Civil conflict and displaced persons living in crowded areas created serious difficulties for surveillance and impeded timely public health responses.
Insights
Six meningococcal disease outbreaks in Angola (1994-2000) affected young adults and children. Mass vaccination campaigns rapidly controlled these epidemics, despite challenges from civil conflict.
Area of Science:
- Epidemiology
- Infectious Diseases
- Public Health
Background:
- Angola experienced six major meningococcal disease outbreaks between 1994 and 2000, documenting 7140 cases.
- The most affected age groups were 15-29 years and 5-14 years, with equal incidence across sexes.
- Both Neisseria meningitidis serogroup A and sporadic serogroup B strains were identified.
Purpose of the Study:
- To describe the epidemiology and control of meningococcal disease outbreaks in Angola.
- To assess the impact of mass vaccination campaigns on epidemic control.
- To identify challenges faced in surveillance and public health response.
Main Methods:
- Retrospective analysis of outbreak data from 1994-2000.
- Documentation of case numbers, affected age groups, and serogroup distribution.
- Evaluation of mass vaccination campaign implementation and impact.
Main Results:
- Outbreaks predominantly involved serogroup A strains, suggesting a potential extension of epidemics beyond the traditional meningitis belt.
- Mass vaccination campaigns utilizing A+C meningococcal polysaccharide vaccine were effective in halting epidemics within weeks.
- Civil conflict and population displacement complicated surveillance and response efforts, particularly in certain regions.
Conclusions:
- Meningococcal disease outbreaks in Angola are significant public health events, potentially linked to broader epidemic trends.
- Rapid mass vaccination is a critical intervention for controlling meningococcal epidemics.
- Socio-political instability poses substantial challenges to effective disease surveillance and public health interventions.