ArticleBMC microbiology2022
Isolation of nontuberculous mycobacteria species from different water sources: a study of six hospitals in Tehran, Iran.
Article in BMC microbiology, 2022. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 6 papers, 1 of them a synthesis that pooled it.
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Who cites it
6 citing papers in PubMed, 1 synthesis or guideline pooled it.
- Prevalence ofFrontiers in microbiology · 2024Pooled it
- Nosocomial Mycobacterium lentiflavum colonization and infection cluster at a Japanese tertiary care center: report of an outbreak/pseudo-outbreak investigation.Antimicrobial stewardship & healthcare epidemiology : ASHE · 2026Article
- Global lineages of non-tuberculous mycobacteria in residential water samples from Germany.BMC microbiology · 2025Article
- Prevalence and drug resistance profiles of nontuberculous mycobacteria isolated from Iranian fish pond waters.Scientific reports · 2025Article
- NGS-based approach for diagnostically unidentifiedFrontiers in cellular and infection microbiology · 2025Article
- Managing Complicated Nontuberculous Mycobacteria Infections in Plastic Surgery.Plastic and reconstructive surgery. Global open · 2024Article
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8 authors.
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Abstract
purposeNontuberculous mycobacteria (NTM) are ubiquitous bacteria that are naturally resistant to disinfectants and antibiotics and can colonize systems for supplying drinking water. Therefore, this study aimed to evaluate the prevalence of NTM in the drinking water of six hospitals in Tehran, Iran.
methodsTotally, 198 water samples were collected. Each water sample was filtered via a membrane filter with a pore size of 0.45 µm and then decontaminated by 0.005% cetylpyridinium chloride. The membrane filters were incubated on two Lowenstein-Jensen media at 25 °C and 37 °C for 8 weeks. The positive cultures were identified with phenotypic tests, and then NTM species were detected according to the hsp65, rpoB, and 16S rDNA genes. Drug susceptibility testing (DST) was also carried out.
resultsOverall, 76 (40.4%) of the isolates were slowly growing mycobacteria (SGM) and 112 (59.6%) of the ones were rapidly growing mycobacteria (RGM). The most common NTM were Mycobacterium aurum, M. gordonae, M. phocaicum, M. mucogenicum, M. kansasii, M. simiae, M. gadium, M. lentiflavum, M. fortuitum, and M. porcinum. Among these 188 samples, NTM ranged from 1 to > 300 colony-forming unit (CFU) /500 mL, with a median of 182 CFU/500 mL. In the infectious department of all hospitals, the amount of CFU was higher than in other parts of the hospitals. The DST findings in this study indicated the diversity of resistance to different drugs. Among RGM, M. mucogenicum was the most susceptible isolate; however, M. fortuitum showed a different resistance pattern. Also, among SGM isolates, M. kansasii and M. simiae, the diversity of DST indicated.
conclusionsThe current study showed NTM strains could be an important component of hospital water supplies and a possible source of nosocomial infections according to the CFU reported in this study. The obtained findings also help clarify the dynamics of NTM variety and distribution in the water systems of hospitals in the research area.
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