Assessment of Prevalence of Non-tuberculous Mycobacteria in Archival Acid-fast Bacilli Positive Smear Slides by TaqMan Real-time PCR Assay.
BACKGROUND
The emergence of non-tuberculous mycobacteria as clinically relevant pathogens has necessitated us for the study of these organisms in the context of their environment. Differentiation of Mycobacterium tuberculosis complex and non-tuberculous mycobacteria is important especially when we have a positive smear slide test result.


OBJECTIVE
In this study, we planned to survey the prevalence of tuberculosis and non-tuberculous mycobacteria among archival acid-fast bacilli positive smear slides.


METHODS
A number of 200 acid-fast bacilli positive smear slides were collected from different parts of Sistan and Baluchestan Province, the biggest province of Iran with the highest incidence of tuberculosis. The presence of mycobacterial IS6110 was evaluated in slides' scraped material by TaqMan real-time polymerase chain reaction assay.


RESULTS
The real-time polymerase chain reaction tests of archival acid-fast bacilli positive smear slides showed that 171 slides from 200 examined slides had M. tuberculosis DNA and in the remaining 29 examined slides, M. tuberculosis DNA was not found.


CONCLUSIONS
Our findings showed that there was no M. tuberculosis DNA in 14.5% of archival AFB positive smear slides, and this finding necessitates us to reviewing our diagnostic and anti- tuberculous protocols.
Cell and Molecular Research Center, School of Medicine, Qazvin University of Medical Sciences, Qazvin, Iran.
Taghi Naserpour
TN
Farivar
Pouran
P
Johari
Abbas Ali
AA
Moien
Mohammad Hashemi
MH
Shahri
Mohammad
M
Naderi
Hamid
H
Oskouie