Abstract
As an important source of human food, milk can be a carrier of human pathogenic bacteria, including tuberculous and nontuberculous mycobacteria (NTM), in its raw and unpasteurized state. In this research, 175 raw milk samples and 175 traditional cheese samples were collected from traditional dairy stores in 22 regions of Tehran in a 9- month period from August 2019 to May 2020. Samples were prepared and transferred to a specialized laboratory, where they were inoculated in Lowenstein-Jensen (LJ) medium containing glycerol or sodium pyruvate, as well as Herrold’s egg-yolk with and without Mycobactin J. to determine the sample’s identity of samples. The recommended 16S rRNA (1436 bp) and hsp65 (644 bp) gene fragments from the positive isolates identified in Ziehl–Neelsen (Z-N) staining were amplified and sequenced using PCR and compared with the sequences of the gene fragments of reference strains available in the global GenBank database. No mycobacterial species were isolated from traditional cheese samples in microbial culture. In case of raw milk samples, a total of four bacteria were collected, all of which were found in the genetic differential testing to be NTM, including n = 1 Mycobacterium heraklionense, n = 2 Mycolicibacterium fortuitum, and n = 1 Mycobacterium thermoresistibile. The analysis of the results obtained by isolate sequencing using the 16S rRNA gene showed higher discriminatory power and percentage similarities in the identification of the isolates than the hsp65 gene.
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Abbreviations
- Z-N:
-
Ziehl-Neelsen
- AFB:
-
Acid-fast bacilli
- NTM:
-
Nontuberculous mycobacteria
- LPSN:
-
List of prokaryotic names with standing in nomenclature
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We would like to sincerely appreciate the cooperation of Razi Vaccine and Serum Research Institute, especially the Tuberculin Department and Aerobic Vaccines Department.
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“This study does not involve any human or animal testing” and“This study approval was granted by the Ethics Committee of Islamic Azad University, Qom (Date 2022.08.30 /No:IR.IAU.QOM.REC.1401.077).”
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Solaghani, T.H., Nazari, R., Mosavari, N. et al. Isolation and identification of nontuberculous mycobacteria from raw milk and traditional cheese based on the 16S rRNA and hsp65 genes, Tehran, Iran. Folia Microbiol 69, 81–89 (2024). https://doi.org/10.1007/s12223-023-01073-9
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DOI: https://doi.org/10.1007/s12223-023-01073-9