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[Meningococcal carrier state and meningococcal diseases in a military unit]
1Zavod za preventivnu medicinu, Vojnomedicinska akademija.
Abstract:
In four recently formed military units pharyngeal meningococcal carrier state and dynamics of nasopharyngeal meningococcal infections have been examined. Carrier state found in at least 50% of recruits at their entering the army has been increased during the first two months for 10-26.4% and it was associated with very significant dynamics of meningococcal infection: changes in carrier state during the first two months have been found in 61.3% of soldiers with very marked changes in distribution of some meningococcal serologic groups among isolated species. Two months later stagnation and lower percentage of the carrier state was observed together with reducing dynamics of meningococcal infection. Meningococcal disease did not occur in the examined environment and this was explained by the absence of virulent meningococcal serotypes. It was concluded that in the risk for meningococcal disease evaluation final identification of meningococcal species isolated from patients and their contacts should be made aiming to timely detection of species known to have significant degree of virulence.
Insights
In military recruits, meningococcal carrier rates initially increased, then stabilized. The absence of virulent strains prevented meningococcal disease, highlighting the importance of identifying specific meningococcal species.
Area of Science:
- Microbiology
- Epidemiology
- Public Health
Background:
- The pharyngeal meningococcal carrier state is a significant factor in the transmission of Neisseria meningitidis.
- Understanding the dynamics of meningococcal colonization in newly formed military units is crucial for assessing disease risk.
Purpose of the Study:
- To examine the prevalence and dynamics of the pharyngeal meningococcal carrier state in military recruits.
- To investigate the association between carrier state changes and meningococcal infection dynamics.
- To evaluate the risk factors for meningococcal disease in this population.
Main Methods:
- Longitudinal study of four military units.
- Monitoring of pharyngeal meningococcal carrier status in recruits over time.
- Identification and serotyping of isolated meningococcal species from nasopharyngeal samples.
Main Results:
- Carrier state exceeded 50% upon entry, increasing by 10-26.4% in the first two months.
- Significant changes in carrier status (61.3%) and serogroup distribution were observed during the initial two months.
- After two months, carrier rates stabilized with reduced infection dynamics.
- No cases of meningococcal disease occurred, attributed to the absence of virulent serotypes.
Conclusions:
- Early military service is a period of dynamic meningococcal colonization.
- The absence of virulent meningococcal serotypes protected against disease in this cohort.
- Accurate identification of meningococcal species, particularly virulent strains, is essential for risk assessment and timely intervention.