MGIT Systems in Tuberculosis Detection: Bridging Culture-Based and Molecular Diagnostics

Abstract Tuberculosis (TB) remains one of the leading infectious causes of morbidity and mortality worldwide, necessitating the development of rapid and reliable diagnostic methods. Culture-based techniques such as the Löwenstein–Jensen medium have long been regarded as the gold standard for TB diagnosis, but their extended turnaround times pose major challenges in timely patient management. Molecular assays, including GeneXpert MTB/RIF and line probe assays, have significantly improved speed and sensitivity; however, they may face limitations in detecting viable bacilli and in providing comprehensive drug susceptibility testing. The Mycobacteria Growth Indicator Tube (MGIT) system represents an important innovation, offering liquid culture–based detection with faster turnaround compared to solid media, and enabling accurate drug resistance profiling. By bridging the gap between conventional culture methods and molecular diagnostics, MGIT enhances diagnostic accuracy and supports global TB control strategies. This article explores the role of MGIT systems in tuberculosis detection, examines their contribution in integrating culture-based and molecular approaches, and highlights their significance in addressing the diagnostic challenges of multidrug-resistant and extensively drug-resistant TB. Keywords: Tuberculosis, MGIT, Liquid Culture, Drug Susceptibility Testing, Molecular Diagnostics, GeneXpert, MDR-TB, XDR-TB