Comparison of Conventional and Molecular Methods in the Detection of Mycobacterium tuberculosis in Clinically Suspected Samples of Tuberculosis
Impeded diagnosis in Tuberculosis may be a major cause of morbidity and mortality among particular group of patients, hence better methods are needed for the accurate detection of tuberculosis (TB) among both smear positive and smear negative cases. This study was aimed to compare conventional an...
| Main Authors: | , , |
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| Format: | Article |
| Language: | English |
| Published: |
Journal of Pure and Applied Microbiology
2019-06-01
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| Series: | Journal of Pure and Applied Microbiology |
| Subjects: | |
| Online Access: | https://microbiologyjournal.org/comparison-of-conventional-and-molecular-methods-in-the-detection-of-mycobacterium-tuberculosis-in-clinically-suspected-samples-of-tuberculosis/ |
| Summary: | Impeded diagnosis in Tuberculosis may be a major cause of morbidity and mortality among particular
group of patients, hence better methods are needed for the accurate detection of tuberculosis (TB)
among both smear positive and smear negative cases. This study was aimed to compare conventional
and molecular methods in detecting Mycobacterium tuberculosis among the clinically suspected
cases of TB. A total of 100 clinically diagnosed TB patients were incorporated in this study. All the
patients were either admitted or attending JSS Hospital, Mysore during the study period i.e., from
January 2018- December 2018. Sputum, Gastric aspirate, Pleural fluid, Ascitic fluid, Pus discharge, CSF
and Tissue samples were gathered for smear microscopy, culture (Lowenstein – Jensen medium) and
PCR testing. The sensitivity of smear and PCR were compared to that of culture considering as gold
standard. 50 of 100 patients were positive on smear microscopy. 51 specimens yielded the growth of
Mycobacterium tuberculosis on Lowenstein-Jensen’s medium and PCR detected the presence of MTB
specific gene in 77 specimens. In clinical diagnosis of tuberculosis, molecular methods are probably
a useful adjunct certainly in smear negative paucibacillary cases. Early diagnosis of TB is cornerstone
for proper treatment and control of this deadly disease. Polymerase chain reaction testing is the most
rapid and sensitive method for the diagnosis of tuberculosis while culture is specific but it takes 4 to 8
weeks to provide results and smear testing is the cheapest but least sensitive test. |
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| ISSN: | 0973-7510 2581-690X |