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Title: A sensitive and specific ES-31 antigen detection based fluorometric assay for confirmation of <i style="">Mycobacterium tuberculosis</i> in<i style=""> </i>cell<i style=""> </i>culture
Authors: Majumdar, Anindita
Wankhade, Gauri
Kamble, Pranita D
Joshi, Deepti
Harinath, B C
Keywords: Diagnostic tests
ES-31 antigen
Immunofluorescent staining
<i style="">Mycobacterium tuberculosis</i>
Issue Date: Apr-2011
Publisher: NISCAIR-CSIR, India
Abstract: Confirmation of presence of <i style="">M. tuberculosis</i> bacilli on microscopic examination is very important in diagnosis of tuberculosis. The present study was undertaken to find the usefulness of mycobacterial ES-31 serine protease as a marker to detect tuberculosis bacilli using fluorescein isothiocyanate conjugated anti-ES-31 serine protease antibody. This immunofluorescence method was compared with Ziehl-Neelsen and auramine-O staining methods for detection of tuberculosis bacilli. Slides were prepared for each serially diluted tuberculosis H<sub>37</sub>Ra bacilli (1×10<sup>7</sup> bacilli/ml to 5<sup> </sup>bacilli/ml). Slides for each dilution group were stained by ZN method, auramine-O and immunostaining methods using fluorescein isothiocyanate conjugated anti-ES-31 serine protease antibody. ZN staining method showed efficacy for detection of <i style="">M. tuberculosis</i> H<sub>37</sub>Ra upto 1×10<sup>4</sup> bacilli/ml while auramine-O method showed upto 1×10<sup>2</sup> bacilli/ml. The presence of bacilli was indicated by green fluorescence on immunostaining using anti-ES-31 antibody conjugate and this method was effective upto 10 bacilli/ml. The slides which were negative for ZN (1×10<sup>3</sup> cells/ml) and auramine-O (100 cells/ml) method showed positivity on restaining with immunofluorescent staining method. The results of this preliminary study showed that immunofluorescent staining method using specific anti-ES-31 antibody conjugate was more sensitive for detection of tuberculosis bacilli than ZN and auramine-O methods in samples of laboratory strain. The utility of this method will be studied further in clinical specimens.
Description: 304-306
ISSN: 0975-1009 (Online); 0019-5189 (Print)
Appears in Collections:IJEB Vol.49(04) [April 2011]

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