Autofluorescence--an important ancillary technique for the detection of Mycobacterium tuberculosis: revisited

Diagnostic Cytopathology
Parul JoshiRavi Mehrotra

Abstract

Tuberculosis is one of the oldest diseases known to affect humans and is caused by Mycobacterium tuberculosis. Lymph nodes are the most common site of extrapulmonary involvement. Tuberculous lymphadenitis can be presumptively diagnosed morphologically on fine-needle aspiration biopsy of lymph nodes. Additional tests like Ziehl-Neelsen (ZN) stain for detection of acid fast bacilli, fluorescence, and molecular markers are often employed for confirmation of diagnosis. However, culture is essential for obtaining a definitive diagnosis. Unfortunately, culture is time consuming and expensive. Newer investigative methods are required. The efficacy of autofluorescence in the diagnosis of tuberculous lymphadenitis was evaluated for this purpose. Fine-needle aspiration biopsies were collected from patients with a clinical diagnosis of tuberculous lymphadenitis. Cytomorphological examination, ZN staining, autofluorescence, and culture were performed on all specimens. ZN staining was positive in 37.5% (30/80) of cases, while autofluorescence was positive in 57.5% (46/80) of patients and was found to have 81.8% specificity, 95% sensitivity, and a positive predictive value of 82.6%. This technique allowed rapid and early diagnosis of tubercu...Continue Reading

References

Aug 2, 2001·Archives of Microbiology·T B BairL Daniels
Mar 30, 2004·Diagnostic Cytopathology·Colleen A WrightGladwyn Leiman
Jan 27, 2006·Applied Microbiology and Biotechnology·Hemant BhattaRobert P Learmonth
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Oct 7, 2008·Journal of Clinical Microbiology·Sol PatiñoLeiria Salazar

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Citations

Jan 24, 2014·Zebrafish·Christopher M WhippsJennifer B Moss
Jul 1, 2014·Diagnostic Cytopathology·Debajyoti Chatterjee, Pranab Dey
Oct 31, 2013·Pathology Research International·Brijesh ThakurJitendra Singh Nigam
Feb 7, 2018·Frontiers in Microbiology·Jaime Esteban, Marta García-Coca

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