Development of an automated MODS plate reader to detect early growth of?Mycobacterium tuberculosis.


Comina, G; Mendoza, D; Velazco, A; Coronel, J; Sheen, P; Gilman, RH; Moore, DA; Zimic, M; (2011) Development of an automated MODS plate reader to detect early growth of?Mycobacterium tuberculosis. Journal of microscopy. ISSN 0022-2720 DOI: https://doi.org/10.1111/j.1365-2818.2010.03477.x

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Abstract

In this work, an automated microscopic observation drug susceptibility (MODS) plate reader has been developed. The reader automatically handles MODS plates and after autofocussing digital images are acquired of the characteristic microscopic cording structures of?Mycobacterium tuberculosis, which are the identification method utilized in the MODS technique to detect tuberculosis and multidrug resistant tuberculosis. In conventional MODS, trained technicians manually move the MODS plate on the stage of an inverted microscope while trying to locate and focus upon the characteristic microscopic cording colonies. In centres with high tuberculosis diagnostic demand, sufficient time may not be available to adequately examine all cultures. An automated reader would reduce labour time and the handling of?M. tuberculosis?cultures by laboratory personnel. Two hundred MODS culture images (100 from tuberculosis positive and 100 from tuberculosis negative sputum samples confirmed by a standard MODS reading using a commercial microscope) were acquired randomly using the automated MODS plate reader. A specialist analysed these digital images with the help of a personal computer and designated them as?M. tuberculosis?present or absent. The specialist considered four images insufficiently clear to permit a definitive reading. The readings from the 196 valid images resulted in a 100% agreement with the conventional nonautomated standard reading. The automated MODS plate reader combined with open-source MODS pattern recognition software provides a novel platform for high throughput automated tuberculosis diagnosis.

Item Type: Article
Faculty and Department: Faculty of Infectious and Tropical Diseases > Dept of Clinical Research
Research Centre: TB Centre
PubMed ID: 21250995
Web of Science ID: 290627600010
URI: http://researchonline.lshtm.ac.uk/id/eprint/1646

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