Evaluation of a two-reagent cold staining method for detection of acid-fast bacilli
Abstract:SETTING: Tuberculosis Research Centre, Chennai, India.
OBJECTIVE: To evaluate a two-reagent cold staining method for detection of acid-fast bacilli in sputum smears.
SPUTUM SAMPLES: Two hundred and forty-four samples from pulmonary tuberculosis patients attending Tuberculosis Research Centre were used.
METHODS AND DESIGN: Two smears were prepared from each of the samples, of which one was allotted to the two-reagent cold staining method and the other to the Ziehl-Neelsen (Z-N) method. The smears were read blind by a single technician. To ensure correct grading, a senior technician checked all positives and 20% of the negative smears. All the samples were processed by modified PetroffÕs method for culture of Mycobacterium tuberculosis.
RESULTS: The concordance (smear grade one above and one below) between the methods was 90% (kappa value, 0.7). The performance of the cold method and the Z-N method was similar when their smear results were compared with culture results (cold method vs. culture, kappa = 0.61; ZN method vs. culture, kappa = 0.67).
CONCLUSION: The two-reagent cold staining method was found to be as sensitive and specific as the Z-N method. However, large-scale multicentric studies in different climatic conditions need to be conducted to assess its efficacy in the diagnosis of pulmonary tuberculosis.
Document Type: Regular Paper
Affiliations: Tuberculosis Research Centre (ICMR), Chennai, India
Publication date: 2002-08-01
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