ArticleInfection and drug resistance2026
Species Diversity of Nontuberculous Mycobacteria in Dental Unit Waterlines: Implications for Infection Control and Clinical Practice.
Article in Infection and drug resistance, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
Background: Dental unit waterlines (DUWLs) are prone to microbial biofilm formation and serve as reservoirs for opportunistic nontuberculous mycobacteria (NTM) that pose infection risks in dental settings. Regional data on the diversity of NTM species in DUWLs, particularly in Iran, remain limited. Objective: This study aimed to determine the prevalence and species diversity of potentially pathogenic NTM in DUWLs from dental practices in Tabriz, Iran. Methods: Thirty 500-mL water samples were collected from DUWLs in private and university-affiliated clinics (May-October 2024) after a 20-30 s flush. Samples were filtered, decontaminated with 0.01% cetylpyridinium chloride, cultured on Löwenstein-Jensen slants at 37°C for 8 weeks, and confirmed as acid-fast bacilli by Ziehl-Neelsen staining. Species identification was performed using partial Results: NTM was isolated from 13 samples (43.33%), yielding 13 isolates. Seven isolates (53.85%) were rapidly growing mycobacteria (RGM: Conclusion: DUWLs in Tabriz harbor diverse NTM with clinical relevance, including rapidly growing species. These findings highlight DUWLs as a potential source of opportunistic infections and emphasize the need for NTM-targeted water quality monitoring and enhanced infection control measures in dental facilities.
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