Background: While efforts have been made to control meningococcal disease or carriage during mass gatherings (MGs), it is still a significant problem. This meta-analysis aims to assess the prevalence and predictors of meningitis carriage during MGs and travel. Methodology: PubMed, Scopus, Embase, and Cochrane were searched from their conception to January 2025. Cohort and cross-sectional studies assessing the prevalence of meningitis carriage and its serotype related to MGs and/or travel, and risk factors associated with its spread, were considered. The Newcastle–Ottawa scale was used for the quality assessment of studies. Results: Out of 1301 studies, 25 were considered for this meta-analysis. The largest geographic area involved was Saudi Arabia. A meta-analysis of 24 studies identified a pooled prevalence rate of meningococcal disease or carriage of 15.9% (95%CI: 4.45–27.4%) and the most frequent infecting organisms to be Serotype C (13.9%; 95%CI: −14.7 to 42.5; 4 studies) and A (11.5%; 95%CI: −2.13 to 25.2; 9 studies) among those at MGs or traveling. Age, gender, smoking history, and the vaccination status did not affect the infection risk. Conclusions: There is an increased prevalence of meningococcal disease and carriage, especially Serogroups A and C, associated with MGs and travel. New interventions and methodologies should be undertaken to control and prevent meningococcal disease or carriage transmission during such events.

Background: Neurodegenerative disorders, including Alzheimer’s disease, Parkinson’s disease, and Amyotrophic Lateral Sclerosis (ALS), involve gradual loss of neurons and functional impairment. There is new proof that neuro-inflammation is critical to the onset and progression of these diseases. The damage to neural tissue as well as the sustained degeneration of neural tissues is caused due to pro-inflammatory cytokines along with microglial activation and immune signaling pathways. This systematic review aims to integrate the existing information about the role of inflammation in neurodegenerative diseases, especially focusing on its mechanisms and possibilities for treatment. Objective: To systematically review existing literature to assess the impact of neuro-inflammation in the main neurodegenerative illness in relation to their pathogenesis. This review attempts to find main predictors of inflammation, explain the primary processes, and evaluate the effects of changing immunological defense responses of the central nervous system on treatment outcomes. Methods: A systematic search was done on PubMed, Scopus, Web of Science, and Google Scholar from the year 2010 to 2025. The inclusion criteria focused on studies dealing with neurodegenerative diseases and had relevant inflammatory biomarkers or mechanisms. The data collected included study design, disease focus, demographics of the markers (cytokines, TLR4, microglial activation), mechanistic pathways, and therapeutic approaches. The quality of studies was evaluated using the Newcastle-Ottawa Scale. Findings through the studies were qualitatively analyzed to identify prevailing themes. Results: There were 123 eligible studies identified through the search. Euro-inflammation was persistently associated with disease evolution in all three paramount disorders. The most frequently examined factors explain neuro degeneration as cytokines (e.g., IL-1β, TNF-α.) and overstimulation of microglia. TLR4 signaling and inflammasome pathways were often related to oxidative stress, synaptic pathology, and neuronal death. About 80% of studies found that modifying inflammatory responses is likely to improve the course of the disease. The results indicate that targeting neuroinflammatory processes has the potential for effective diagnosis and treatment. Conclusions: From this systematic review, hyper inflammation is one of the most important phenomena during the progression of neurodegenerative disorders. Inflammation-related neurodegeneration such as cytokine release and microglial activity provides damage to the neurons, constituting a rational basis for therapy. Greater focus on unmasking treatment will premise strategies based on timing of the intervention, controlling inflammation, and the use of multidisciplinary approaches into practice.