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Tuberculosis Research and Treatment
Volume 2015 (2015), Article ID 794064, 6 pages
http://dx.doi.org/10.1155/2015/794064
Research Article

Performance of LED Fluorescence Microscopy for the Diagnosis of Pulmonary Tuberculosis in HIV Positive Individuals in Addis Ababa, Ethiopia

1Biomedical Institute, College of Health Science, Mekelle University, P.O. Box 1871, Mekelle, Ethiopia
2Department of Microbiology, Immunology and Parasitology, School of Medicine, College of Health Science, Addis Ababa University, P.O. Box 9086, Addis Ababa, Ethiopia
3Ethiopian Public Health Institute, P.O. Box 1248, Addis Ababa, Ethiopia
4Armauer Hansen Research Institute, Addis Ababa, Ethiopia

Received 19 August 2015; Accepted 4 November 2015

Academic Editor: William N. Rom

Copyright © 2015 Konjit Getachew et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Background. Despite its lower sensitivity, smear microscopy remains the main diagnostic method for pulmonary tuberculosis (PTB) in resource-limited countries as TB culturing methods like LJ (Lowenstein-Jensen) are expensive to use as a routine base. This study aimed to evaluate the performance of LED-FM for the diagnosis of PTB in HIV positive individuals. Methods. Cross-sectional study was conducted in Zewditu Memorial Hospital and Teklehaimanot Health Center HIV/ART clinics in Addis Ababa, Ethiopia. Each sample was stained with ZN and Auramine O staining and examined with bright-field microscope and LED-FM microscope, respectively. LJ culture was used as a reference. Results. Out of 178 study participants, twenty-four (13.5%) patients were confirmed as positive for MTB with LJ culture. The yield of ZN microscopy and LED-FM in direct and concentrated sample was 3.9%, 8.4%, 6.2%, and 8.4%, respectively. Sensitivity, specificity, positive predictive value (PPV), and negative predictive value (NPV) of direct ZN microscopy were 29.2%, 100%, 100%, and 90.1%, respectively, and of LED-FM microscopy in direct sputum sample were 62.5%, 100%, 100%, and 94.5%, respectively. Conclusion. LED-FM has better sensitivity for the diagnosis of PTB in HIV positive individuals as compared to conventional ZN microscopy. LED-FM can be used as an alternative to conventional ZN microscopy.