Evaluation of Microscopic observation drug susceptibility (MODS) assay as a rapid, sensitive and inexpensive test for detection of tuberculosis and multidrug resistant tuberculosis
Journal Title: Medical Journal Armed Forces - Year 2019, Vol 75, Issue 1
Abstract
Background: Microscopic observation drug susceptibility (MODS) assay has been suggested as a low cost method for rapid, accurate detection of tuberculosis (TB) and multidrug resistant tuberculosis (MDR-TB). Methods: A total of 2424 samples collected from 1063 eligible patients of suspected pulmonary or extrapulmonary TB were subjected to MODS assay. Performance of MODS was compared with culture and drug susceptibility testing (DST) by conventional solid Lowenstein–Jensen (LJ) media or liquid Mycobacteria Growth Indicator Tube (MGIT) culture. Results: When compared to reference gold standard of positivity in either solid or liquid reference culture, the MODS assay had sensitivity, specificity, positive predictive value and negative predictive value of 91.3%, 98.2%, 96.0% and 95.9% respectively. MODS took a median time of 10.3 days to culture positivity as compared to 13.8 days using MGIT and 30.5 days using LJ culture. Culture and DST being concurrent in MODS, the median turnaround time for DST was the same as that for culture i.e. 10.3 days. The overall median turn around time for culture positivity and DST using manual MGIT and LJ medium was 23.6 days and 61.2 days respectively. The concordance between MODS culture and the reference susceptibility method was 97.7% for rifampicin, 95.6% for isoniazid, 98.5% for rifampicin and isoniazid. The cost of performing a single MODS assay was INR 200. Conclusion: MODS is a rapid and sensitive, yet simple and inexpensive test that may be helpful to enhance diagnostic accuracy, and case detection of TB and MDR-TB in resource constrained settings.
Authors and Affiliations
A. Agarwal
Keywords
Related Articles
- EP ID EP665493
- DOI 10.1016/j.mjafi.2018.03.011
- Views 78
- Downloads 0
Comparison of balloon dacryocystorhinostomy with conventional endonasal endoscopic dacryocystorhinostomy for relief of acquired distal nasolacrimal drainage obstruction and its impact on quality of life: A prospective, randomized, controlled study
Background: We compared balloon dacryocystorhinostomy with conventional endoscopic dacryocystorhinostomy for the management of acquired distal nasolacrimal obstruction and the quality of life post procedure. Methods: 98...
Comparison between continuous thoracic epidural block and continuous thoracic paravertebral block in the management of thoracic trauma
Background: Postoperative pain is thought to be the single most important factor leading to ineffective ventilation and impaired secretion clearance after thoracic trauma. Effective pain relief can be provided by thoraci...
Prevalence and the risk factors of gastro-esophageal reflux disease in medical students
Background: Gastroesophageal reflux disease (GERD) is a commonly prevalent gastrointestinal disorder in adults. Very few studies on magnitude of GERD in student community have been done and there is none so far from Indi...
To evaluate the safety and efficacy of the TVT-Secur procedure in the treatment of stress urinary incontinence in women
Background: The prevalence of stress urinary incontinence (SUI) in the middle-aged Indian women is around 16%. The use of transvaginal tapes (TVTs) has revolutionised the surgical management of SUI. Patients who undergo...
Artery first approach for resecting ganglioneuroma encasing superior mesenteric artery
Ganglioneuromas are rare and account for 1% of primary retroperitoneal tumors.1,2 Their origin from sympathetic chain predisposes them to be inconveniently abutted to major vessels, rendering their excision exigent.1,2 W...