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Population genetics and molecular epidemiology of Neisseria meningitidis
1WHO Collaborating Centre for Reference and Research on Meningococci, Department of Bacteriology, National Institute of Public Health, Oslo, Norway.
Abstract:
Under non-epidemic conditions, Neisseria meningitidis causes disease primarily in children under the age of 5 and the cases are sporadic without any evident relationship between them. Occasionally, localized outbreaks of meningococcal disease occur, and sometimes epidemic waves of disease may spread to several countries or even continents and constitute a pandemic. In the past 10 years or so, population genetic analyses have provided insights into the biology of the bacterium and the epidemiology of meningococcal disease, improving our understanding of the cause of epidemics. Through the application of molecular methods, and especially multilocus enzyme electrophoresis, to N. meningitidis strains of worldwide origin, it has been possible to identify virulent clones and provide a surveillance system to warn of meningococcal epidemics. The characteristics of the predominant clones which are nowadays causing meningococcal disease in the world are summarized here and the importance of population genetics in interpreting the epidemiological data is illustrated.
Insights
Population genetics reveals virulent clones of Neisseria meningitidis, aiding in the surveillance and prediction of meningococcal disease epidemics. This research improves understanding of bacterial biology and disease spread.
Area of Science:
- Microbiology
- Epidemiology
- Population Genetics
Background:
- Neisseria meningitidis causes sporadic disease in young children under non-epidemic conditions.
- Meningococcal disease can manifest as localized outbreaks or widespread pandemics.
- Recent advances in population genetics offer new insights into the bacterium's biology and disease epidemiology.
Purpose of the Study:
- To identify virulent clones of Neisseria meningitidis using molecular methods.
- To establish a surveillance system for predicting meningococcal epidemics.
- To interpret epidemiological data through the lens of population genetics.
Main Methods:
- Application of molecular methods to Neisseria meningitidis strains of worldwide origin.
- Utilizing multilocus enzyme electrophoresis (MEE) for strain analysis.
- Population genetic analyses to understand bacterial biology and epidemiology.
Main Results:
- Identification of specific virulent clones responsible for current meningococcal disease.
- Development of a surveillance system based on molecular epidemiology.
- Demonstration of population genetics' importance in understanding disease patterns.
Conclusions:
- Population genetics is crucial for understanding the epidemiology of meningococcal disease.
- Molecular methods, particularly MEE, enable the identification of key bacterial clones.
- This approach enhances surveillance and prediction of meningococcal epidemics.