Asian Journal of Advances in Medical Science

Neisseria meningitidis is a Gram-negative diplococcus that colonises the human nasopharynx and represents a significant cause of invasive bacterial disease worldwide. Although asymptomatic carriage of N. meningitidis is common in healthy individuals, the organism may occasionally invade the bloodstream and central nervous system, resulting in invasive meningococcal disease (IMD). The most frequent clinical manifestations of IMD include meningitis and meningococcal septicaemia, both of which are associated with rapid disease progression, high mortality rates, and substantial long-term morbidity among survivors. This review provides a comprehensive overview of Neisseria meningitidis as an important human pathogen. It summarises current knowledge regarding the microbiological characteristics, virulence determinants, and pathogenic mechanisms of the organism, as well as host immune responses involved in infection control. The review further examines patterns of asymptomatic carriage and modes of transmission, together with environmental and host-related factors that influence disease spread. In addition, the global epidemiology of meningococcal disease is discussed, highlighting regional variations in disease distribution. Clinical manifestations, diagnostic approaches, and laboratory identification methods are also reviewed. Current therapeutic strategies, including antimicrobial treatment and supportive care, are outlined alongside available vaccination programmes and public health interventions for disease prevention and control. By integrating findings from published scientific literature and public health sources, this review emphasises the continuing global health importance of Neisseria meningitidis. Sustained surveillance, effective vaccination strategies, and ongoing research are essential to reduce the burden of meningococcal disease worldwide.