Tuberculosis - A narrative review of diagnosis, treatment , prevention and current challenges.

ABSTRACT Background Tuberculosis (TB) is a major communicable infectious disease caused by Mycobacterium tuberculosis. It commonly presents as a lung disease, but it may also affect other organs and tissues. It is mainly transmitted by respiratory droplets of a person with infectious pulmonary tuberculosis, who coughs, sneezes, speaks, or sings. Despite effective diagnostic methods, preventive measures, and anti-tuberculosis medicines, tuberculosis continues to be an important public-health issue. Its continued burden is further influenced by delayed diagnosis, transmission within communities, barriers to accessing healthcare, treatment-related issues, and the emergence of drug-resistant tuberculosis. Objective The objective of this study was to provide a comprehensive review of tuberculosis, discussing its causative organism, transmission, pathogenesis, clinical manifestations, diagnosis, treatment, drug resistance, and prevention. Special attention was paid to commonly used diagnostic methods, including sputum-based investigations, sputum smear microscopy, culture, chest radiography, and rapid molecular diagnostic tests such as Xpert MTB/RIF. It also aimed at describing the general principles of anti-tuberculosis therapy and the importance of appropriate treatment and adherence to prevent treatment failure and drug resistance. Methods A literature-based narrative review was conducted using information obtained from published scientific literature, PubMed-indexed research, medical journals, and reports and guidelines from recognized health organizations, particularly the World Health Organization (WHO). Relevant literature was identified using search terms including “tuberculosis,” “Mycobacterium tuberculosis,” “pulmonary tuberculosis,” “TB diagnosis,” “sputum smear microscopy,” “chest radiography,” “Xpert MTB/RIF,” “TB treatment,” “drug-resistant tuberculosis,” and “TB prevention.” Relevant studies, reviews, clinical guidance documents, and public-health reports were selected on their scientific relevance and relation to the objectives of the review. The information was organized according to major themes, including transmission, pathogenesis, clinical manifestations, diagnosis, treatment, drug resistance, and prevention. Since this study was a narrative literature review, no original patient recruitment, clinical trial, laboratory experiment, or independent sample-size calculation was performed. Results The reviewed literature demonstrated that tuberculosis predominantly presents as a lung disease and common symptoms include cough, fever, night sweats, fatigue, lack of appetite, and weight loss. Diagnosis may involve sputum smear microscopy, culture, molecular rapid diagnostic tests, and chest radiography. Molecular diagnostic approaches such as Xpert MTB/RIF play an important role in rapid detection of tuberculosis and can provide information regarding rifampicin resistance, which may aid in early clinical management. The literature also showed that appropriate anti-tuberculosis treatment can successfully manage drug-susceptible TB when the recommended regimen is taken properly and completed. However, drug-resistant TB remains a major challenge as resistance may limit the available treatment options and complicate disease management. The reviewed evidence also emphasized the importance of early diagnosis, timely initiation of effective treatment, treatment adherence, infection-control measures, contact investigation, preventive treatment wherever indicated, vaccination, and public-health education to control TB. Conclusion Tuberculosis remains to be a significant infectious-disease and public-health issue, despite being preventable and treatable. Effective TB control requires an integrated approach, including early and accurate diagnosis, appropriate anti-tuberculosis therapy, prevention of transmission, identification and management of drug resistance, and improved access to healthcare. Strengthening of diagnostic capacity and public-health interventions, improvement in treatment adherence, increased community awareness, and continued research into improved diagnostic and therapeutic approaches are essential for reducing TB-related morbidity, mortality, and transmission. Continued implementation of evidence-based TB-control strategies is needed to reduce the global burden of tuberculosis.