Comparisons among the diagnostic methods used for the detection of extra-pulmonary tuberculosis in Bangladesh

Abstract

The present study was an attempt to establish a suitable method for the effective diagnosis of extra-pulmonary tuberculosis in Bangladesh. In this regard, detection of Mycobacterium tuberculosis from 390 different extra-pulmonary specimens was performed by Bright-Field microscopy, light-emitting diode fluorescence microscopy and Lowenstein–Jensen culture methods, followed by an extensive comparison among these methods. M. tuberculosis was detected in 53 cases through the conventional Lowenstein–Jensen culture method; 49 cases were detected under Bright-Field microscope, whereas the light-emitting diode fluorescence microscopy detected 64 cases. Out of 53 culture-positive isolates, 12 were found to be multi-drug resistant. Light-emitting diode fluorescence microscopy was found to be more sensitive and effective than both the Bright-Field microscopy and the Lowenstein–Jensen culture methods. Incidentally, light-emitting diode fluorescence microscopy appeared imperative to detecting the multi-drug resistant tuberculosis.

Keywords

• Extra-pulmonary tuberculosis (TB)
• Light-emitting diode (LED) fluorescence microscopy
• Lowenstein–Jensen (L–J) culture