Abstract
Conjugate vaccines are widely used to overcome the disadvantages of polysaccharide vaccines in the prevention of meningococcal disease. However, limited studies have examined the clinical effectiveness of single-dose meningococcal quadrivalent conjugate vaccines in adults. We assessed the effectiveness of the meningococcal vaccination program in the Republic of Korea Armed Forces, since 2013. Following vaccination program implementation, meningococcal disease cases decreased from 0.52/100,000 to 0.06/100,000 and the number of deaths declined from four to zero. Two meningococcal cases that developed post-implementation were identified as serotype B and X. The effectiveness of single-dose conjugate vaccination in recruits, expressed as the incidence rate ratio, was 0.88 during a 19–23-month observation period. These results indicate that meningococcal infections can be prevented by single-dose administration of the quadrivalent conjugate vaccine in at-risk groups, such as soldiers, travelers, and students in dormitories. Continuous investigation is needed to determine serogroup change, including B serogroups.
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