Increased detection by restaining of acid-fast bacilli in sputum samples transported in cetylpyridinium chloride solution

Selvakumar, N and Gomathi Sekar, M and Ilampurnam, K J and Ponnuraja, C and Narayanan, P R (2005) Increased detection by restaining of acid-fast bacilli in sputum samples transported in cetylpyridinium chloride solution. International Journal of Tuberculosis and Lung Disease, 9 (2). pp. 195-199. ISSN Print: 1027-3719; Online: 1815-7920

PDF 200540.pdf - Published Version Restricted to Registered users only Download (70kB) | Request a copy

Abstract

SETTING: Seventeen health facilities in a Tuberculosis Unit, and the Tuberculosis Research Centre (TRC), Chennai, India. AIM: Evaluation of restaining by the auramine-phenol method for detection of acid-fast bacilli (AFB) in direct smears of samples transported in cetylpyridinium chloride (CPC) solution. METHODS: Among patients attending the above health facilities, 730 samples were collected in CPC and transported to the TRC. Two direct smears were prepared from each sample, one stained by the usual auraminephenol method (primary staining) and the other stained again by the same method (restaining) for examination by fluorescence microscopy. All the samples were processed for culture of Mycobacterium tuberculosis. RESULTS: A significantly higher proportion (49.6%) of samples were positive by restaining compared to primary staining (32.5%, P � 0.0001). Of 362 samples positive by restaining, 38.7% were negative by primary staining. The yield of different grades of smears was significantly higher with restaining than with primary staining (P � 0.0001). More smear-negative culturepositive smears were observed with the primary than with the restaining method (178/400 [44.5%] vs. 78/ 400 [19.5%], P � 0.001). CONCLUSION: The rate of detection of AFB in direct smears made from sputum samples transported in

Item Type:	Article
Uncontrolled Keywords:	Mycobacterium tuberculosis; AFB; auramine-phenol staining; cetylpyridinium chloride
Subjects:	Tuberculosis > Laboratory Research > Bacteriological
Divisions:	Basic Science Research > Bacteriology
Depositing User:	Dr. Rathinasabapati R
Date Deposited:	28 Nov 2013 10:52
Last Modified:	09 Mar 2016 08:49
URI:	http://eprints.nirt.res.in/id/eprint/718

Actions (login required)

View Item