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Leoni C, Vinci L, Marzano M, D’Erchia AM, Dellino M, Cox SN, Vitagliano A, Visci G, Notario E, Filomena E, Cicinelli E, Pesole G, Ceci LR. Endometrial Cancer: A Pilot Study of the Tissue Microbiota. Microorganisms 2024; 12:1090. [PMID: 38930472 PMCID: PMC11205883 DOI: 10.3390/microorganisms12061090] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/26/2024] [Revised: 05/20/2024] [Accepted: 05/23/2024] [Indexed: 06/28/2024] Open
Abstract
BACKGROUND The endometrium remains a difficult tissue for the analysis of microbiota, mainly due to the low bacterial presence and the sampling procedures. Among its pathologies, endometrial cancer has not yet been completely investigated for its relationship with microbiota composition. In this work, we report on possible correlations between endometrial microbiota dysbiosis and endometrial cancer. METHODS Women with endometrial cancer at various stages of tumor progression were enrolled together with women with a benign polymyomatous uterus as the control. Analyses were performed using biopsies collected at two specific endometrial sites during the surgery. This study adopted two approaches: the absolute quantification of the bacterial load, using droplet digital PCR (ddPCR), and the analysis of the bacterial composition, using a deep metabarcoding NGS procedure. RESULTS ddPCR provided the first-ever assessment of the absolute quantification of bacterial DNA in the endometrium, confirming a generally low microbial abundance. Metabarcoding analysis revealed a different microbiota distribution in the two endometrial sites, regardless of pathology, accompanied by an overall higher prevalence of pathogenic bacterial genera in cancerous tissues. CONCLUSIONS These results pave the way for future studies aimed at identifying potential biomarkers and gaining a deeper understanding of the role of bacteria associated with tumors.
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Affiliation(s)
- Claudia Leoni
- Institute of Biomembranes, Bioenergetics and Molecular Biotechnologies, National Research Council (CNR), Via Amendola n. 122/O, 70126 Bari, Italy; (M.M.); (E.N.)
| | - Lorenzo Vinci
- 2nd Unit of Obstetrics and Gynaecology, Department of Biomedical Science and Human Oncology, University of Bari “A. Moro”, Piazza G. Cesare, 70124 Bari, Italy; (L.V.); (M.D.); (A.V.); (E.C.)
| | - Marinella Marzano
- Institute of Biomembranes, Bioenergetics and Molecular Biotechnologies, National Research Council (CNR), Via Amendola n. 122/O, 70126 Bari, Italy; (M.M.); (E.N.)
| | - Anna Maria D’Erchia
- Department of Biosciences, Biotechnologies and Environment, University of Bari A. Moro, Via Orabona n. 4, 70126 Bari, Italy; (A.M.D.); (S.N.C.); (G.V.); (E.F.); (G.P.)
| | - Miriam Dellino
- 2nd Unit of Obstetrics and Gynaecology, Department of Biomedical Science and Human Oncology, University of Bari “A. Moro”, Piazza G. Cesare, 70124 Bari, Italy; (L.V.); (M.D.); (A.V.); (E.C.)
| | - Sharon Natasha Cox
- Department of Biosciences, Biotechnologies and Environment, University of Bari A. Moro, Via Orabona n. 4, 70126 Bari, Italy; (A.M.D.); (S.N.C.); (G.V.); (E.F.); (G.P.)
| | - Amerigo Vitagliano
- 2nd Unit of Obstetrics and Gynaecology, Department of Biomedical Science and Human Oncology, University of Bari “A. Moro”, Piazza G. Cesare, 70124 Bari, Italy; (L.V.); (M.D.); (A.V.); (E.C.)
| | - Grazia Visci
- Department of Biosciences, Biotechnologies and Environment, University of Bari A. Moro, Via Orabona n. 4, 70126 Bari, Italy; (A.M.D.); (S.N.C.); (G.V.); (E.F.); (G.P.)
| | - Elisabetta Notario
- Institute of Biomembranes, Bioenergetics and Molecular Biotechnologies, National Research Council (CNR), Via Amendola n. 122/O, 70126 Bari, Italy; (M.M.); (E.N.)
| | - Ermes Filomena
- Department of Biosciences, Biotechnologies and Environment, University of Bari A. Moro, Via Orabona n. 4, 70126 Bari, Italy; (A.M.D.); (S.N.C.); (G.V.); (E.F.); (G.P.)
| | - Ettore Cicinelli
- 2nd Unit of Obstetrics and Gynaecology, Department of Biomedical Science and Human Oncology, University of Bari “A. Moro”, Piazza G. Cesare, 70124 Bari, Italy; (L.V.); (M.D.); (A.V.); (E.C.)
| | - Graziano Pesole
- Department of Biosciences, Biotechnologies and Environment, University of Bari A. Moro, Via Orabona n. 4, 70126 Bari, Italy; (A.M.D.); (S.N.C.); (G.V.); (E.F.); (G.P.)
| | - Luigi Ruggiero Ceci
- Institute of Biomembranes, Bioenergetics and Molecular Biotechnologies, National Research Council (CNR), Via Amendola n. 122/O, 70126 Bari, Italy; (M.M.); (E.N.)
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Kalu CM, Mudau KL, Masindi V, Ijoma GN, Tekere M. Occurrences and implications of pathogenic and antibiotic-resistant bacteria in different stages of drinking water treatment plants and distribution systems. Heliyon 2024; 10:e26380. [PMID: 38434035 PMCID: PMC10906316 DOI: 10.1016/j.heliyon.2024.e26380] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/01/2023] [Revised: 12/05/2023] [Accepted: 02/12/2024] [Indexed: 03/05/2024] Open
Abstract
Different stages of drinking water treatment plants (DWTPs) play specific roles in diverse contaminants' removal present in natural water sources. Although the stages are recorded to promote adequate treatment of water, the occurrence of pathogenic bacteria (PB) and antibiotic-resistant bacteria (ARB) in the treated water and the changes in their diversity and abundance as it passed down to the end users through the drinking water distribution systems (DWDSs), is a great concern, especially to human health. This could imply that the different stages and the distribution system provide a good microenvironment for their growth. Hence, it becomes pertinent to constantly monitor and document the diversity of PB and ARB present at each stage of the treatment and distribution system. This review aimed at documenting the occurrence of PB and ARB at different stages of treatment and distribution systems as well as the implication of their occurrence globally. An exhaustive literature search from Web of Science, Science-Direct database, Google Scholar, Academic Research Databases like the National Center for Biotechnology Information, Scopus, and SpringerLink was done. The obtained information showed that the different treatment stages and distribution systems influence the PB and ARB that proliferate. To minimize the human health risks associated with the occurrence of these PB, the present review, suggests the development of advanced technologies that can promote quick monitoring of PB/ARB at each treatment stage and distribution system as well as reduction of the cost of environomics analysis to promote better microbial analysis.
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Affiliation(s)
- Chimdi M. Kalu
- Department of Environmental Science, College of Agriculture and Environmental Sciences, University of South Africa, Florida, 1710, South Africa
| | - Khuthadzo L. Mudau
- Department of Environmental Science, College of Agriculture and Environmental Sciences, University of South Africa, Florida, 1710, South Africa
| | - Vhahangwele Masindi
- Department of Environmental Science, College of Agriculture and Environmental Sciences, University of South Africa, Florida, 1710, South Africa
- Magalies Water, Scientific Services, Research & Development Division, Brits, South Africa
| | - Grace N. Ijoma
- Department of Environmental Science, College of Agriculture and Environmental Sciences, University of South Africa, Florida, 1710, South Africa
| | - Memory Tekere
- Department of Environmental Science, College of Agriculture and Environmental Sciences, University of South Africa, Florida, 1710, South Africa
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Chochlakis D, Sandalakis V, Ntoukakis A, Daskalaki MO, Loppinet T, Thalassinaki N, Makridaki R, Panoulis C, Psaroulaki A. Multi-criterion analysis of the effect of physico-chemical microbiological agents on Legionella detection in hotel water distribution systems in Crete. Front Cell Infect Microbiol 2023; 13:1214717. [PMID: 38188625 PMCID: PMC10770838 DOI: 10.3389/fcimb.2023.1214717] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/30/2023] [Accepted: 10/17/2023] [Indexed: 01/09/2024] Open
Abstract
Introduction Water distribution systems in hotels have been related to outbreaks caused by Legionella spp. Certain measures, including disinfection by chlorination, maintaining increased temperatures are usually undertaken to prevent Legionella outbreaks. However, these preventive strategies are not always effective, since there are several factors (e.g., synergistic interactions with other microbes, physico-chemical factors, biofilm formation, availability of nutrients) that promote survival and proliferation of the pathogen in water pipes., Accordingly, there is a need of a holistic approach in development of preventive models for Legionella outbreaks associated with water distribution systems. Methods Water samples were collected from hotel water systems and were tested for the presence of Legionella, E. coli, total coliforms, total mesophilic count and Pseudomonas. In each sample, temperature and chlorine were also tested. Other epidemiological factors were additionally recorded including number of rooms, stars, proximity of sampling point to the boiler, etc. Data were processed by generalized linear analysis, and modeling based on logistic regression analysis to identify independent predictive factors associated with the presence of Legionella in hotel water systems. Results According to the generalized linear model, temperature affected (p<0.05) the presence of Legionella regardless of the species or the water supply (hot or cold). Additionally, opportunistic (P. aeruginosa) or non-opportunistic (E. coli, coliforms) pathogens were significantly associated (p<0.05) with the presence of all Legionella species. Temperature also exhibited a positive effect to all pathogens tested except for Pseudomonas according to the linear model. Multivariate analysis showed that Pseudomonas, total coliforms, HPC and temperature had a statistically significant effect on the presence of Legionella. Based on a binomial model, cold water had a positive effect on Legionella. Type of sampling and proximity of the sample to the boiler seemed to pose different effect on Legionella depending on the cfu/L. The number of hotel stars and rooms did not appear to have any effect in all tested models. Discussion Collectively, these results indicate the need for development of individualized water safety plans tailored by the presence of other microbiological agents, and unique physico-chemical factors, which could facilitate the survival of Legionella.in hotel water systems.
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Affiliation(s)
- Dimosthenis Chochlakis
- Regional Laboratory of Public Health of Crete, School of Medicine, University of Crete, Heraklion, Greece
- Laboratory of Clinical Microbiology and Microbial Pathogenesis, School of Medicine, University of Crete, Heraklion, Greece
| | - Vassilios Sandalakis
- Laboratory of Clinical Microbiology and Microbial Pathogenesis, School of Medicine, University of Crete, Heraklion, Greece
| | - Apostolos Ntoukakis
- Laboratory of Clinical Microbiology and Microbial Pathogenesis, School of Medicine, University of Crete, Heraklion, Greece
| | - Maria-Olga Daskalaki
- Laboratory of Clinical Microbiology and Microbial Pathogenesis, School of Medicine, University of Crete, Heraklion, Greece
| | - Thomas Loppinet
- Laboratory of Clinical Microbiology and Microbial Pathogenesis, School of Medicine, University of Crete, Heraklion, Greece
| | - Niki Thalassinaki
- Laboratory of Clinical Microbiology and Microbial Pathogenesis, School of Medicine, University of Crete, Heraklion, Greece
| | - Rena Makridaki
- Laboratory of Clinical Microbiology and Microbial Pathogenesis, School of Medicine, University of Crete, Heraklion, Greece
| | - Christos Panoulis
- Laboratory of Clinical Microbiology and Microbial Pathogenesis, School of Medicine, University of Crete, Heraklion, Greece
| | - Anna Psaroulaki
- Regional Laboratory of Public Health of Crete, School of Medicine, University of Crete, Heraklion, Greece
- Laboratory of Clinical Microbiology and Microbial Pathogenesis, School of Medicine, University of Crete, Heraklion, Greece
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Flores-Contreras EA, González-González RB, González-González E, Melchor-Martínez EM, Parra-Saldívar R, Iqbal HMN. Detection of Emerging Pollutants Using Aptamer-Based Biosensors: Recent Advances, Challenges, and Outlook. BIOSENSORS 2022; 12:1078. [PMID: 36551045 PMCID: PMC9775161 DOI: 10.3390/bios12121078] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 10/16/2022] [Revised: 11/17/2022] [Accepted: 11/21/2022] [Indexed: 06/17/2023]
Abstract
The synergistic potentialities of innovative materials that include aptamers have opened new paradigms in biosensing platforms for high-throughput monitoring systems. The available nucleobase functional moieties in aptamers offer exclusive features for bioanalytical sensing applications. In this context, compared to various in-practice biological recognition elements, the utilization of aptamers in detection platforms results in an extensive range of advantages in terms of design flexibility, stability, and sensitivity, among other attributes. Thus, the utilization of aptamers-based biosensing platforms is extensively anticipated to meet unaddressed challenges of various in-practice and standard analytical and sensing techniques. Furthermore, the superior characteristics of aptasensors have led to their applicability in the detection of harmful pollutants present in ever-increasing concentrations in different environmental matrices and water bodies, seeking to achieve simple and real-time monitoring. Considering the above-mentioned critiques and notable functional attributes of aptamers, herein, we reviewed aptamers as a fascinating interface to design, develop, and deploy a new generation of monitoring systems to aid modern bioanalytical sensing applications. Moreover, this review aims to summarize the most recent advances in the development and application of aptasensors for the detection of various emerging pollutants (EPs), e.g., pharmaceutical, and personal care products (PPCPs), endocrine-disrupting chemicals (EDCs), pesticides and other agricultural-related compounds, and toxic heavy elements. In addition, the limitations and current challenges are also reviewed, considering the technical constraints and complexity of the environmental samples.
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Affiliation(s)
- Elda A. Flores-Contreras
- Tecnologico de Monterrey, School of Engineering and Sciences, Monterrey 64849, Nuevo León, Mexico
- Institute of Advanced Materials for Sustainable Manufacturing, Tecnologico de Monterrey, Monterrey 64849, Nuevo León, Mexico
| | - Reyna Berenice González-González
- Tecnologico de Monterrey, School of Engineering and Sciences, Monterrey 64849, Nuevo León, Mexico
- Institute of Advanced Materials for Sustainable Manufacturing, Tecnologico de Monterrey, Monterrey 64849, Nuevo León, Mexico
| | - Everardo González-González
- Laboratorio de Fisiología Molecular y Estructural, Facultad de Ciencias Biológicas, Universidad Autónoma de Nuevo León, San Nicolás de los Garza 66455, Nuevo León, Mexico
| | - Elda M. Melchor-Martínez
- Tecnologico de Monterrey, School of Engineering and Sciences, Monterrey 64849, Nuevo León, Mexico
- Institute of Advanced Materials for Sustainable Manufacturing, Tecnologico de Monterrey, Monterrey 64849, Nuevo León, Mexico
| | - Roberto Parra-Saldívar
- Tecnologico de Monterrey, School of Engineering and Sciences, Monterrey 64849, Nuevo León, Mexico
- Institute of Advanced Materials for Sustainable Manufacturing, Tecnologico de Monterrey, Monterrey 64849, Nuevo León, Mexico
| | - Hafiz M. N. Iqbal
- Tecnologico de Monterrey, School of Engineering and Sciences, Monterrey 64849, Nuevo León, Mexico
- Institute of Advanced Materials for Sustainable Manufacturing, Tecnologico de Monterrey, Monterrey 64849, Nuevo León, Mexico
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Barmettler K, Biggel M, Treier A, Muchaamba F, Vogler BR, Stephan R. Occurrence and Characteristics of Escherichia albertii in Wild Birds and Poultry Flocks in Switzerland. Microorganisms 2022; 10:microorganisms10112265. [PMID: 36422334 PMCID: PMC9699108 DOI: 10.3390/microorganisms10112265] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/19/2022] [Revised: 11/06/2022] [Accepted: 11/08/2022] [Indexed: 11/16/2022] Open
Abstract
Escherichia albertii, a zoonotic pathogen, has sporadically been associated with infectious diarrhea in humans. Poultry and wild birds are considered potential reservoirs. We assessed the occurrence of E. albertii in 280 fecal samples from wild birds (n = 130) and pooled fecal samples collected at slaughterhouse level from poultry flocks (n = 150) in Switzerland. Using an E. albertii-specific PCR targeting the Eacdt gene, 23.8% (31/130) of the samples from wild birds, but not from the pooled poultry fecal samples, tested positive for Eacdt. The positive samples originated from 11 bird species belonging to eight families. Strain isolation was attempted on the PCR-positive samples by subculturing the broth cultures onto xylose–MacConkey plates. Isolation was possible on 12 of the 31 Eacdt-PCR-positive samples. Whole-genome sequencing revealed that the strains belonged to nine distinct sequence types, with ST13420 and ST5967 being represented by two and three isolates, respectively. All strains harbored the eae gene, while two strains were also positive for stx2f. Our study thus shows that E. albertii is present in the Swiss wild bird population, which can potentially act as a source of this pathogen to humans, other animals, and the environment.
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Affiliation(s)
- Karen Barmettler
- Institute for Food Safety and Hygiene, Vetsuisse Faculty, University of Zurich, 8057 Zurich, Switzerland
| | - Michael Biggel
- Institute for Food Safety and Hygiene, Vetsuisse Faculty, University of Zurich, 8057 Zurich, Switzerland
| | - Andrea Treier
- Institute for Food Safety and Hygiene, Vetsuisse Faculty, University of Zurich, 8057 Zurich, Switzerland
| | - Francis Muchaamba
- Institute for Food Safety and Hygiene, Vetsuisse Faculty, University of Zurich, 8057 Zurich, Switzerland
| | - Barbara Renate Vogler
- National Reference Centre for Poultry and Rabbit Diseases (NRGK), Institute of Food Safety and Hygiene, Vetsuisse Faculty, University of Zurich, 8057 Zurich, Switzerland
| | - Roger Stephan
- Institute for Food Safety and Hygiene, Vetsuisse Faculty, University of Zurich, 8057 Zurich, Switzerland
- Correspondence:
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Hirose S, Nakamura Y, Arai S, Hara-Kudo Y. The Development and Evaluation of a Selective Enrichment for the Detection of Escherichia albertii in Food. Foodborne Pathog Dis 2022; 19:704-712. [DOI: 10.1089/fpd.2022.0048] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Affiliation(s)
- Shouhei Hirose
- Division of Microbiology, National Institute of Health Sciences, Kawasaki, Japan
| | | | - Sakura Arai
- Division of Microbiology, National Institute of Health Sciences, Kawasaki, Japan
| | - Yukiko Hara-Kudo
- Division of Microbiology, National Institute of Health Sciences, Kawasaki, Japan
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Péter H, Zuberbühler K, Hobaiter C. Well-digging in a community of forest-living wild East African chimpanzees (Pan troglodytes schweinfurthii). Primates 2022; 63:355-364. [PMID: 35662388 PMCID: PMC9273564 DOI: 10.1007/s10329-022-00992-4] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/16/2021] [Accepted: 05/07/2022] [Indexed: 10/31/2022]
Abstract
Access to resources shapes species' physiology and behaviour. Water is not typically considered a limiting resource for rainforest-living chimpanzees; however, several savannah and savannah-woodland communities show behavioural adaptations to limited water. Here, we provide a first report of habitual well-digging in a rainforest-living group of East African chimpanzees (Pan troglodytes schweinfurthii) and suggest that it may have been imported into the community's behavioural repertoire by an immigrant female. We describe the presence and frequency of well-digging and related behaviour, and suggest that its subsequent spread in the group may have involved some degree of social learning. We highlight that subsurface water is a concealed resource, and that the limited spread of well-digging in the group may highlight the cognitive, rather than physical, challenges it presents in a rainforest environment.
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Affiliation(s)
- Hella Péter
- School of Psychology and Neuroscience, University of St Andrews, St Andrews, UK.,School of Anthropology and Conservation, University of Kent, Canterbury, UK
| | - Klaus Zuberbühler
- School of Psychology and Neuroscience, University of St Andrews, St Andrews, UK.,Department of Comparative Cognition, University of Neuchâtel, Neuchâtel, Switzerland.,Budongo Conservation Field Station, PO Box 362, Masindi, Uganda
| | - Catherine Hobaiter
- School of Psychology and Neuroscience, University of St Andrews, St Andrews, UK. .,Budongo Conservation Field Station, PO Box 362, Masindi, Uganda.
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Muchaamba F, Barmettler K, Treier A, Houf K, Stephan R. Microbiology and Epidemiology of Escherichia albertii—An Emerging Elusive Foodborne Pathogen. Microorganisms 2022; 10:microorganisms10050875. [PMID: 35630320 PMCID: PMC9145129 DOI: 10.3390/microorganisms10050875] [Citation(s) in RCA: 12] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/05/2022] [Revised: 04/19/2022] [Accepted: 04/19/2022] [Indexed: 02/03/2023] Open
Abstract
Escherichia albertii, a close relative of E. coli, is an emerging zoonotic foodborne pathogen associated with watery diarrhea mainly in children and immunocompromised individuals. E. albertii was initially classified as eae-positive Hafnia alvei, however, as more genetic and biochemical information became available it was reassigned to its current novel taxonomy. Its infections are common under conditions of poor hygiene with confirmed transmission via contaminated water and food, mainly poultry-based products. This pathogen has been isolated from various domestic and wild animals, with most isolates being derived from birds, implying that birds among other wild animals might act as its reservoir. Due to the absence of standardized isolation and identification protocols, E. albertii can be misidentified as other Enterobacteriaceae. Exploiting phenotypes such as its inability to ferment rhamnose and xylose and PCR assays targeting E. albertii-specific genes such as the cytolethal distending toxin and the DNA-binding transcriptional activator of cysteine biosynthesis encoding genes can be used to accurately identify this pathogen. Several gaps exist in our knowledge of E. albertii and need to be bridged. A deeper understanding of E. albertii epidemiology and physiology is required to allow the development of effective measures to control its transmission and infections. Overall, current data suggest that E. albertii might play a more significant role in global infectious diarrhea cases than previously assumed and is often overlooked or misidentified. Therefore, simple, and efficient diagnostic tools that cover E. albertii biodiversity are required for effective isolation and identification of this elusive agent of diarrhea.
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Affiliation(s)
- Francis Muchaamba
- Institute for Food Safety and Hygiene, Vetsuisse Faculty, University of Zurich, 8057 Zurich, Switzerland; (K.B.); (A.T.); (R.S.)
- Correspondence:
| | - Karen Barmettler
- Institute for Food Safety and Hygiene, Vetsuisse Faculty, University of Zurich, 8057 Zurich, Switzerland; (K.B.); (A.T.); (R.S.)
| | - Andrea Treier
- Institute for Food Safety and Hygiene, Vetsuisse Faculty, University of Zurich, 8057 Zurich, Switzerland; (K.B.); (A.T.); (R.S.)
| | - Kurt Houf
- Department of Veterinary and Biosciences, Faculty of Veterinary Medicine, Ghent University, 9820 Merelbeke, Belgium;
| | - Roger Stephan
- Institute for Food Safety and Hygiene, Vetsuisse Faculty, University of Zurich, 8057 Zurich, Switzerland; (K.B.); (A.T.); (R.S.)
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Han M, Zhang L, Zhang N, Mao Y, Peng Z, Huang B, Zhang Y, Wang Z. Antibiotic resistome in a large urban-lake drinking water source in middle China: Dissemination mechanisms and risk assessment. JOURNAL OF HAZARDOUS MATERIALS 2022; 424:127745. [PMID: 34799156 DOI: 10.1016/j.jhazmat.2021.127745] [Citation(s) in RCA: 30] [Impact Index Per Article: 15.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/19/2021] [Revised: 10/29/2021] [Accepted: 11/08/2021] [Indexed: 06/13/2023]
Abstract
The increasing pollution of urban drinking water sources by antibiotic resistance genes (ARGs) threatens human health worldwide. However, the distribution and influencing factors of ARGs, especially how to reveal the risks of ARGs in this environment remains unclear. Hence, Chaohu Lake was selected as an example to investigate the characteristics of ARGs and explore the interactions among physicochemical factors, microorganisms, and ARGs by metagenomic approach. In this work, 75 ARG subtypes with an average of 30.4 × /Gb (ranging from 15.2 ×/Gb to 57.9 ×/Gb) were identified, and multidrug and bacA were most frequent in Chaohu Lake. Non-random co-occurrence patterns and potential host bacteria of ARGs were revealed through co-occurrence networks. Microbial community and mobile genetic elements (MGEs) were the major direct factors in ARG profiles. The dissemination of ARGs was mainly driven by plasmids. Considering the interactions among MGEs, human bacterial pathogens, and ARGs, antibiotic resistome risk index (ARRI) was proposed to manifest the risks of ARGs. Overall, our work systemically investigated the composition and associated factors of ARGs and built ARRI to estimate the potential risks of ARGs in a typical urban drinking water source, providing an intuitive indicator for managing similar lakes.
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Affiliation(s)
- Maozhen Han
- School of Life Science, Anhui Medical University, Hefei, Anhui 230032, China
| | - Lu Zhang
- Key Laboratory for Environment and Disaster Monitoring and Evaluation of Hubei, Innovation Academy for Precision Measurement Science and Technology, Chinese Academy of Science, Wuhan 430077, China; University of Chinese Academy of Sciences, Beijing 100049, China
| | - Na Zhang
- School of Life Science, Anhui Medical University, Hefei, Anhui 230032, China
| | - Yujie Mao
- School of Life Science, Anhui Medical University, Hefei, Anhui 230032, China
| | - Zhangjie Peng
- School of Life Science, Anhui Medical University, Hefei, Anhui 230032, China
| | - Binbin Huang
- School of Life Science, Anhui Medical University, Hefei, Anhui 230032, China
| | - Yan Zhang
- School of Life Sciences, Hefei Normal University, Hefei, Anhui 230601, China.
| | - Zhi Wang
- Key Laboratory for Environment and Disaster Monitoring and Evaluation of Hubei, Innovation Academy for Precision Measurement Science and Technology, Chinese Academy of Science, Wuhan 430077, China.
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Ye C, Xian X, Bao R, Zhang Y, Feng M, Lin W, Yu X. Recovery of microbiological quality of long-term stagnant tap water in university buildings during the COVID-19 pandemic. THE SCIENCE OF THE TOTAL ENVIRONMENT 2022; 806:150616. [PMID: 34592279 PMCID: PMC9752782 DOI: 10.1016/j.scitotenv.2021.150616] [Citation(s) in RCA: 11] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/01/2021] [Revised: 09/19/2021] [Accepted: 09/22/2021] [Indexed: 05/10/2023]
Abstract
Stagnant water can cause water quality deterioration and, in particular, microbiological contaminations, posing potential health risks to occupants. University buildings were unoccupied with little water usage during the COVID-19 pandemic. It's an opportunity to study microbiological quality of long-term stagnant water (LTSW) in university buildings. The tap water samples were collected for three months from four types of campus buildings to monitor water quality and microbial risks after long-term stagnation. Specifically, the residual chlorine, turbidity, and iron/zinc were disqualified, and the heterotrophic plate counts (HPC) exceeded the Chinese national standard above 100 times. It took 4-54 days for these parameters to recover to the routine levels. Six species of pathogens were detected with high frequency and levels (101-105 copies/100 mL). Remarkably, L. pneumophilia occurred in 91% of samples with turbidity > 1 NTU. The absence of the culturable cells for these bacteria possibly implied their occurrence in a viable but non-culturable (VBNC) status. The bacterial community of the stagnant tap water differed significantly and reached a steady state in more than 50 days. Furthermore, a high concentration of endotoxin (>10 EU/mL) was found in LTSW, which was in accordance with the high proportion of dead bacteria. The results suggested that the increased microbiological risks require more attention and the countermeasures before the building reopens should be taken.
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Affiliation(s)
- Chengsong Ye
- College of the Environment & Ecology, Xiamen University, Xiamen 361102, PR China
| | - Xuanxuan Xian
- College of the Environment & Ecology, Xiamen University, Xiamen 361102, PR China
| | - Ruihan Bao
- College of the Environment & Ecology, Xiamen University, Xiamen 361102, PR China
| | - Yiting Zhang
- College of the Environment & Ecology, Xiamen University, Xiamen 361102, PR China; Key Lab of Urban Environment and Health, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen 361021, PR China
| | - Mingbao Feng
- College of the Environment & Ecology, Xiamen University, Xiamen 361102, PR China
| | - Wenfang Lin
- Key Lab of Urban Environment and Health, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen 361021, PR China
| | - Xin Yu
- College of the Environment & Ecology, Xiamen University, Xiamen 361102, PR China.
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11
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Arai S, Yamaya S, Ohtsuka K, Konishi N, Obata H, Ooka T, Hirose S, Kai A, Hara-Kudo Y. Detection of Escherichia albertii in Retail Oysters. J Food Prot 2022; 85:173-179. [PMID: 34591074 DOI: 10.4315/jfp-21-222] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/28/2021] [Accepted: 09/29/2021] [Indexed: 11/11/2022]
Abstract
ABSTRACT Escherichia albertii is an emerging foodborne pathogen. Owing to its distribution in river water, it is important to determine the presence of E. albertii in aquaculture-related foods. In this study, we investigated the distribution of E. albertii in retail oyster samples. A total of 427 raw oyster samples (385 Pacific oysters and 42 Japanese rock oysters) were enriched in modified Escherichia coli broth (mEC) or mEC supplemented with novobiocin (NmEC) at 42°C. The cultures were used for E. albertii-specific nested PCR assay, as well as for E. albertii isolation using deoxycholate hydrogen sulfide lactose agar (DHL), DHL supplemented with rhamnose and xylose, and MacConkey agar supplemented with rhamnose and xylose. The population of E. albertii in nested PCR-positive samples was determined using the most-probable-number (MPN) method. E. albertii isolates were subjected to biochemical and genetic characterization. E. albertii was detected in 5 (1.6%) of 315 Pacific oyster samples (one piece each), 2 (2.9%) of 70 Pacific oyster samples (25 g each), and 2 (4.8%) of 42 Japanese rock oyster samples procured from four geographically distinct regions. A total of 64 E. albertii strains were isolated from eight of the nine nested PCR assay-positive oyster samples, and the MPN value was under the detection limit (<3 MPN/10 g). A specific season or month for detecting E. albertii was not observed in this study, suggesting that the pathogen is present in seawater. All the E. albertii isolates, except one, were positive for the virulence factor eae, indicating that these isolates have the potential to infect humans. HIGHLIGHTS
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Affiliation(s)
- Sakura Arai
- Division of Microbiology, National Institute of Health Sciences, 3-25-26, Tonomachi, Kawasaki-ku, Kawasaki, Kanagawa 210-9501, Japan
| | - Satoko Yamaya
- Miyagi Prefectural Institute of Public Health and Environment, 4-7-2, Saiwai-cho, Miyagino-ku, Sendai 983-0836, Japan
| | - Kayoko Ohtsuka
- Saitama Institute of Public Health, 410-1, Ewai, Yoshimi-machi, Hiki-gun, Saitama 355-0133, Japan
| | - Noriko Konishi
- Tokyo Metropolitan Institute of Public Health, 3-24-1, Hyakunin-cho, Shinjuku-ku, Tokyo 169-0073, Japan
| | - Hiromi Obata
- Tokyo Metropolitan Institute of Public Health, 3-24-1, Hyakunin-cho, Shinjuku-ku, Tokyo 169-0073, Japan
| | - Tadasuke Ooka
- Department of Microbiology, Graduate School of Medical and Dental Sciences, Kagoshima University, 8-35-1, Sakuragaoka, Kagoshima city, Kagoshima 890-8544, Japan
| | - Shouhei Hirose
- Division of Microbiology, National Institute of Health Sciences, 3-25-26, Tonomachi, Kawasaki-ku, Kawasaki, Kanagawa 210-9501, Japan
| | - Akemi Kai
- Japan Food Hygiene Association, 2-5-47, Tadao, Machida-city, Tokyo 194-0035, Japan
| | - Yukiko Hara-Kudo
- Division of Microbiology, National Institute of Health Sciences, 3-25-26, Tonomachi, Kawasaki-ku, Kawasaki, Kanagawa 210-9501, Japan
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12
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Zhang C, Lu J. Legionella: A Promising Supplementary Indicator of Microbial Drinking Water Quality in Municipal Engineered Water Systems. FRONTIERS IN ENVIRONMENTAL SCIENCE 2021; 9:1-22. [PMID: 35004706 PMCID: PMC8740890 DOI: 10.3389/fenvs.2021.684319] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/06/2023]
Abstract
Opportunistic pathogens (OPs) are natural inhabitants and the predominant disease causative biotic agents in municipal engineered water systems (EWSs). In EWSs, OPs occur at high frequencies and concentrations, cause drinking-water-related disease outbreaks, and are a major factor threatening public health. Therefore, the prevalence of OPs in EWSs represents microbial drinking water quality. Closely or routinely monitoring the dynamics of OPs in municipal EWSs is thus critical to ensuring drinking water quality and protecting public health. Monitoring the dynamics of conventional (fecal) indicators (e.g., total coliforms, fecal coliforms, and Escherichia coli) is the customary or even exclusive means of assessing microbial drinking water quality. However, those indicators infer only fecal contamination due to treatment (e.g., disinfection within water utilities) failure and EWS infrastructure issues (e.g., water main breaks and infiltration), whereas OPs are not contaminants in drinking water. In addition, those indicators appear in EWSs at low concentrations (often absent in well-maintained EWSs) and are uncorrelated with OPs. For instance, conventional indicators decay, while OPs regrow with increasing hydraulic residence time. As a result, conventional indicators are poor indicators of OPs (the major aspect of microbial drinking water quality) in EWSs. An additional or supplementary indicator that can well infer the prevalence of OPs in EWSs is highly needed. This systematic review argues that Legionella as a dominant OP-containing genus and natural inhabitant in EWSs is a promising candidate for such a supplementary indicator. Through comprehensively comparing the behavior (i.e., occurrence, growth and regrowth, spatiotemporal variations in concentrations, resistance to disinfectant residuals, and responses to physicochemical water quality parameters) of major OPs (e.g., Legionella especially L. pneumophila, Mycobacterium, and Pseudomonas especially P. aeruginosa), this review proves that Legionella is a promising supplementary indicator for the prevalence of OPs in EWSs while other OPs lack this indication feature. Legionella as a dominant natural inhabitant in EWSs occurs frequently, has a high concentration, and correlates with more microbial and physicochemical water quality parameters than other common OPs. Legionella and OPs in EWSs share multiple key features such as high disinfectant resistance, biofilm formation, proliferation within amoebae, and significant spatiotemporal variations in concentrations. Therefore, the presence and concentration of Legionella well indicate the presence and concentrations of OPs (especially L. pneumophila) and microbial drinking water quality in EWSs. In addition, Legionella concentration indicates the efficacies of disinfectant residuals in EWSs. Furthermore, with the development of modern Legionella quantification methods (especially quantitative polymerase chain reactions), monitoring Legionella in ESWs is becoming easier, more affordable, and less labor-intensive. Those features make Legionella a proper supplementary indicator for microbial drinking water quality (especially the prevalence of OPs) in EWSs. Water authorities may use Legionella and conventional indicators in combination to more comprehensively assess microbial drinking water quality in municipal EWSs. Future work should further explore the indication role of Legionella in EWSs and propose drinking water Legionella concentration limits that indicate serious public health effects and require enhanced treatment (e.g., booster disinfection).
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Affiliation(s)
- Chiqian Zhang
- Pegasus Technical Services, Inc., Cincinnati, OH, United States
| | - Jingrang Lu
- Office of Research and Development, United States Environmental Protection Agency, Cincinnati, OH, United States
- Correspondence: Jingrang Lu,
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13
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Wang HT, Liang ZZ, Ding J, Xue XM, Li G, Fu SL, Zhu D. Arsenic bioaccumulation in the soil fauna alters its gut microbiome and microbial arsenic biotransformation capacity. JOURNAL OF HAZARDOUS MATERIALS 2021; 417:126018. [PMID: 33984785 DOI: 10.1016/j.jhazmat.2021.126018] [Citation(s) in RCA: 16] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/15/2021] [Revised: 04/17/2021] [Accepted: 04/26/2021] [Indexed: 06/12/2023]
Abstract
The biotransformation of arsenic mediated by microorganisms plays an important role in the arsenic biogeochemical cycle. However, the fate and biotransformation of arsenic in different soil fauna gut microbiota are largely unknown. Herein the effects of arsenic contamination on five types of soil fauna were compared by examining variations in arsenic bioaccumulation, gut microbiota, and arsenic biotransformation genes (ABGs). Significant difference was observed in the arsenic bioaccumulation across several fauna body tissues, and Metaphire californica had the highest arsenic bioaccumulation, with a value of 107 ± 1.41 mg kg-1. Arsenic exposure significantly altered overall patterns of ABGs; however, dominant genes involved in arsenic redox and other genes involved in arsenic methylation and demethylation were not significantly changed across animals. Except for M. californica, the abundance of ABGs in other animal guts firstly increased and then decreased with increasing arsenic concentrations. In addition, exposure of soil fauna to arsenic led to shifts in the unique gut-associated bacterial community, but the magnitude of these changes varied significantly across ecological groups of soil fauna. A good correlation between the gut bacterial communities and ABG profiles was observed, suggesting that gut microbiota plays important roles in the biotransformation of arsenic. Overall, these results provide a universal profiling of a microbial community capable of arsenic biotransformation in different fauna guts. Considering the global distribution of soil fauna in the terrestrial ecosystem, this finding broadens our understanding of the hidden role of soil fauna in the arsenic bioaccumulation and biogeochemical cycle.
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Affiliation(s)
- Hong-Tao Wang
- College of Environment and Planning, Henan University, Kaifeng 475004, China; Key Laboratory of Geospatial Technology for the Middle and Lower Yellow River Regions (Henan University), Ministry of Education, Kaifeng 475004, China
| | - Zong-Zheng Liang
- High Technology Research and Development Center, Ministry of Science and Technology, Beijing 100044, China
| | - Jing Ding
- School of Environmental and Material Engineering, Yantai University, Yantai 264005, China
| | - Xi-Mei Xue
- Key Laboratory of Urban Environment and Health, Institute of Urban Environment, Chinese Academy of Sciences, 1799 Jimei Road, Xiamen 361021, China
| | - Gang Li
- Key Laboratory of Urban Environment and Health, Institute of Urban Environment, Chinese Academy of Sciences, 1799 Jimei Road, Xiamen 361021, China
| | - Sheng-Lei Fu
- College of Environment and Planning, Henan University, Kaifeng 475004, China; Key Laboratory of Geospatial Technology for the Middle and Lower Yellow River Regions (Henan University), Ministry of Education, Kaifeng 475004, China
| | - Dong Zhu
- State Key Laboratory of Urban and Regional Ecology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China.
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14
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Arai S, Ohtsuka K, Konishi N, Ohya K, Konno T, Tokoi Y, Nagaoka H, Asano Y, Maruyama H, Uchiyama H, Takara T, Hara-Kudo Y. Evaluating Methods for Detecting Escherichia albertii in Chicken Meat. J Food Prot 2021; 84:553-562. [PMID: 33159453 DOI: 10.4315/jfp-20-206] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/25/2020] [Accepted: 11/06/2020] [Indexed: 11/11/2022]
Abstract
ABSTRACT Escherichia albertii is an emerging foodborne pathogen. The source of the E. albertii infection in most foodborne outbreaks is unknown because E. albertii is difficult to isolate from suspected food or water. E. albertii has a broad host range among birds and can be isolated from chicken meat. In this study, PCR assay, enrichment, and isolation conditions for detecting E. albertii in chicken meat were evaluated. The growth of 47 E. albertii strains isolated in Japan between 1994 and 2018 and a type strain was evaluated in modified EC broth (mEC) and mEC supplemented with novobiocin (NmEC) and on media containing carbohydrates. The enzyme used for the nested PCR, the enrichment conditions, the most-probable-number (MPN) method, and agar media were also evaluated with chicken meat. To distinguish E. albertii from presumptive non-E. albertii bacteria, desoxycholate hydrogen sulfide lactose agar (DHL), MacConkey agar (MAC), and these agars supplemented with rhamnose and xylose (RX-DHL and RX-MAC, respectively) were used. All E. albertii strains grew in mEC and NmEC at both 36 and 42°C and did not utilize rhamnose, sucrose, or xylose. Both the first and nested PCRs with TaKaRa Ex Taq, which was 10 to 100 times more active than the other enzymes, produced positive results in enrichment culture of 25 g of chicken meat inoculated with >20 CFU of E. albertii and incubated in mEC and NmEC at 42°C for 22 ± 2 h. Thus, the first PCR was sensitive enough to detect E. albertii in chicken meat. The MPN values in mEC and NmEC were 0.5- and 2.3-fold higher than the original inoculated bacterial levels, respectively. E. albertii in chicken meat was more efficiently isolated with enrichment in NmEC (70.1 to 100%) and plating onto RX-DHL (85.4%) and RX-MAC (100%) compared with enrichment in mEC (53.5 to 83.3%) and plating onto DHL (70.1%) and MAC (92.4%). Thus, optimized conditions for the surveillance of E. albertii contamination in food and investigations of E. albertii outbreaks, including the infectious dose, were clarified. HIGHLIGHTS
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Affiliation(s)
- Sakura Arai
- Division of Microbiology, National Institute of Health Sciences, 3-25-26, Tonomachi, Kawasaki-ku, Kawasaki, Kanagawa 210-9501, Japan.,(ORCID: https://orcid.org/0000-0001-6572-1800 [S.A.])
| | - Kayoko Ohtsuka
- Saitama Institute of Public Health, 410-1, Ewai, Yoshimi-machi, Hiki-gun, Saitama 355-0133, Japan
| | - Noriko Konishi
- Tokyo Metropolitan Institute of Public Health, 3-24-1, Hyakunin-cho, Shinjuku, Tokyo 169-0073, Japan
| | - Kenji Ohya
- Division of Microbiology, National Institute of Health Sciences, 3-25-26, Tonomachi, Kawasaki-ku, Kawasaki, Kanagawa 210-9501, Japan
| | - Takayuki Konno
- Akita Prefectural Research Center for Public Health and Environment, 6-6, Senshukubota-machi, Akita 010-0874, Japan
| | - Yuki Tokoi
- Utsunomiya City Institute of Public Health and Environment, Takebayashi-machi, Utsunomiya, Tochigi 321-0974, Japan
| | - Hiromi Nagaoka
- Shizuoka Institute of Environment and Hygiene, 4-27-2, Kitaandou, Aoi-ku, Shizuoka 420-8637, Japan
| | - Yukiko Asano
- Ehime Prefectural Institute of Public Health and Environmental Science, 8-234, Sanbancho, Matsuyama, Ehime 790-0003, Japan
| | - Hiroyuki Maruyama
- Fukuoka City Institute of Health and Environment, 2-1-34 Jigyohama, Chuo-ku, Fukuoka 810-0065, Japan
| | - Hiroko Uchiyama
- Miyazaki Prefectural Institute for Public Health and Environment, 2-3-2 Gakuenkibanadai-Nishi, Miyazaki 889-2155, Japan
| | - Takatoshi Takara
- Okinawa Prefectural Institute of Health and Environment, 17-1 Kanekadan, Uruma-shi, Okinawa 904-2241, Japan
| | - Yukiko Hara-Kudo
- Division of Microbiology, National Institute of Health Sciences, 3-25-26, Tonomachi, Kawasaki-ku, Kawasaki, Kanagawa 210-9501, Japan
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15
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Strom M, Crowley T, Shigdar S. Novel Detection of Nasty Bugs, Prevention Is Better than Cure. Int J Mol Sci 2020; 22:E149. [PMID: 33375709 PMCID: PMC7795740 DOI: 10.3390/ijms22010149] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/08/2020] [Revised: 12/21/2020] [Accepted: 12/22/2020] [Indexed: 12/11/2022] Open
Abstract
Hospital-acquired infections (HAIs) are a growing concern around the world. They contribute to increasing mortality and morbidity rates and are an economic threat. All hospital patients have the potential to contract an HAI, but those with weakened or inferior immune systems are at highest risk. Most hospital patients will contract at least one HAI, but many will contract multiple ones. Bacteria are the most common cause of HAIs and contribute to 80-90% of all HAIs, with Staphylococcus aureus, Clostridium difficile, Escherichia coli, Acinetobacter baumannii, Pseudomonas aeruginosa and Klebsiella pneumoniae accounting for the majority. Each of these bacteria are highly resistant to antibiotics and can produce a protective film, known as a biofilm, to further prevent their eradication. It has been shown that by detecting and eradicating bacteria in the environment, infection rates can be reduced. The current methods for detecting bacteria are time consuming, non-specific, and prone to false negatives or false positives. Aptamer-based biosensors have demonstrated specific, time-efficient and simple detection, highlighting the likelihood that they could be used in a similar way to detect HAI-causing bacteria.
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Affiliation(s)
- Mia Strom
- School of Medicine, Deakin University, Geelong 3216, Australia; (M.S.); (T.C.)
| | - Tamsyn Crowley
- School of Medicine, Deakin University, Geelong 3216, Australia; (M.S.); (T.C.)
- Centre for Molecular and Medical Research, Deakin University, Geelong 3216, Australia
| | - Sarah Shigdar
- School of Medicine, Deakin University, Geelong 3216, Australia; (M.S.); (T.C.)
- Centre for Molecular and Medical Research, Deakin University, Geelong 3216, Australia
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16
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Carvalheira A, Silva J, Teixeira P. Acinetobacter spp. in food and drinking water - A review. Food Microbiol 2020; 95:103675. [PMID: 33397609 DOI: 10.1016/j.fm.2020.103675] [Citation(s) in RCA: 45] [Impact Index Per Article: 11.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/25/2020] [Revised: 11/02/2020] [Accepted: 11/03/2020] [Indexed: 01/01/2023]
Abstract
Acinetobacter spp. has emerged as a pathogen of major public health concern due to their increased resistance to antibiotics and their association with a wide range of nosocomial infections, community-acquired infections and war and natural disaster-related infections. It is recognized as a ubiquitous organism however, information about the prevalence of different pathogenic species of this genus in food sources and drinking water is scarce. Since the implementation of molecular techniques, the role of foods as a source of several species, including the Acinetobacter baumannii group, has been elucidated. Multidrug resistance was also detected among Acinetobacter spp. isolated from food products. This highlights the importance of foods as potential sources of dissemination of Acinetobacter spp. between the community and clinical environments and reinforces the need for further investigations on the potential health risks of Acinetobacter spp. as foodborne pathogens. The aim of this review was to summarize the published data on the occurrence of Acinetobacter spp. in different food sources and drinking water. This information should be taken into consideration by those responsible for infection control in hospitals and other healthcare facilities.
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Affiliation(s)
- Ana Carvalheira
- Universidade Católica Portuguesa, CBQF - Centro de Biotecnologia e Química Fina - Laboratório Associado, Escola Superior de Biotecnologia, Rua Diogo Botelho 1327, 4169-005, Porto, Portugal
| | - Joana Silva
- Universidade Católica Portuguesa, CBQF - Centro de Biotecnologia e Química Fina - Laboratório Associado, Escola Superior de Biotecnologia, Rua Diogo Botelho 1327, 4169-005, Porto, Portugal
| | - Paula Teixeira
- Universidade Católica Portuguesa, CBQF - Centro de Biotecnologia e Química Fina - Laboratório Associado, Escola Superior de Biotecnologia, Rua Diogo Botelho 1327, 4169-005, Porto, Portugal.
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17
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Ao X, Chen Z, Li S, Li C, Lu Z, Sun W. The impact of UV treatment on microbial control and DBPs formation in full-scale drinking water systems in northern China. J Environ Sci (China) 2020; 87:398-410. [PMID: 31791513 DOI: 10.1016/j.jes.2019.08.003] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/05/2019] [Revised: 08/01/2019] [Accepted: 08/01/2019] [Indexed: 06/10/2023]
Abstract
To manage potential microbial risks and meet increasingly strict drinking water health standards, UV treatment has attracted increasing attention for use in drinking water systems in China. However, the effects of UV treatment on microbial control and disinfection by-products (DBPs) formation in real municipal drinking water systems are poorly understood. Here, we collected water samples from three real drinking water systems in Beijing and Tianjin to investigate the impacts of UV treatment on microbial control and DBP formation. We employed heterotrophic plate count (HPC), flow cytometry (FCM), quantitative PCR analysis, and high-throughput sequencing to measure microorganisms in the samples. Different trends were observed between HPC and total cell count (measured by FCM), indicating that a single indicator could not reflect the real degree of biological re-growth in drinking water distribution systems (DWDSs). A significant increase in the 16S rRNA gene concentration was observed when the UV system was stopped. Besides, the bacterial community composition was similar at the phylum level but differed markedly at the genera level among the three DWDSs. Some chlorine-resistant bacteria, including potential pathogens (e.g., Acinetobacter) showed a high relative abundance when the UV system was turned off. It can be concluded that UV treatment can mitigate microbial re-growth to some extent. Finally, UV treatment had a limited influence on the formation of DBPs, including trihalomethanes, haloacetic acids, and nitrogenated DBPs. The findings of this study may help to understand the performance of UV treatment in real drinking water systems.
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Affiliation(s)
- Xiuwei Ao
- School of Environment, Tsinghua University, Beijing 100084, China
| | - Zhongyun Chen
- School of Environment, Tsinghua University, Beijing 100084, China
| | - Simiao Li
- School of Environment, Tsinghua University, Beijing 100084, China
| | - Chen Li
- School of Environment, Tsinghua University, Beijing 100084, China
| | - Zedong Lu
- School of Environment, Tsinghua University, Beijing 100084, China
| | - Wenjun Sun
- School of Environment, Tsinghua University, Beijing 100084, China..
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18
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Liu L, Xing X, Hu C, Wang H. O 3-BAC-Cl 2: A multi-barrier process controlling the regrowth of opportunistic waterborne pathogens in drinking water distribution systems. J Environ Sci (China) 2019; 76:142-153. [PMID: 30528006 DOI: 10.1016/j.jes.2018.04.017] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/11/2018] [Revised: 04/19/2018] [Accepted: 04/20/2018] [Indexed: 06/09/2023]
Abstract
Simulated drinking water distribution system (DWDS) treated with O3-BAC-Cl2 (ozone-biological activated carbon-chlorine) was constructed to study its effects on the regrowth of five typical opportunistic pathogens (OPs). It was found that O3-BAC-Cl2 could significantly reduce the regrowth of target OPs in the effluents of DWDS compared with Cl2 and O3-Cl2 with the same residual chlorine levels. However, the effect of O3-BAC-Cl2 on the average numbers of target OPs gene markers in the biofilms of DWDS was not apparent, suggesting that OPs in the biofilms of DWDS were tolerant to the upstream disinfection process. The quantification of target OPs in the BAC-filter column demonstrated that OPs decreased with the increase of depth, which was likely due to the organic nutrient gradient and microbial competition inside the BAC-filter. Increase in the ozone dose could further reduce the OPs at the bottom of the BAC-filter. Spearman correlation analysis demonstrated that some significant correlations existed between target microorganisms, suggesting potential microbial ecological relationships. Overall, our results demonstrated that the BAC-filter may act as a "battlefield" suppressing the OPs through microbial competition. O3-BAC-Cl2 could be an effective multi-barrier process to suppress the proliferation of OPs in the bulk water of DWDS. However, OPs protected by the biofilms of DWDS should receive further attention because OPs may be detached and released from the biofilms.
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Affiliation(s)
- Lizhong Liu
- Key Laboratory of Drinking Water Science and Technology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China; University of Chinese Academy of Sciences, Beijing 100049, China
| | - Xueci Xing
- Key Laboratory of Drinking Water Science and Technology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China; University of Chinese Academy of Sciences, Beijing 100049, China.
| | - Chun Hu
- Key Laboratory for Water Quality and Conservation of the Pearl River Delta, Ministry of Education, Institute of Environmental Research at Greater Bay, Guangzhou University, Guangzhou 510006, China
| | - Haibo Wang
- Key Laboratory of Drinking Water Science and Technology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China
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19
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Merino N, Zhang S, Tomita M, Suzuki H. Comparative genomics of Bacteria commonly identified in the built environment. BMC Genomics 2019; 20:92. [PMID: 30691394 PMCID: PMC6350394 DOI: 10.1186/s12864-018-5389-z] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/13/2018] [Accepted: 12/18/2018] [Indexed: 02/01/2023] Open
Abstract
BACKGROUND The microbial community of the built environment (BE) can impact the lives of people and has been studied for a variety of indoor, outdoor, underground, and extreme locations. Thus far, these microorganisms have mainly been investigated by culture-based methods or amplicon sequencing. However, both methods have limitations, complicating multi-study comparisons and limiting the knowledge gained regarding in-situ microbial lifestyles. A greater understanding of BE microorganisms can be achieved through basic information derived from the complete genome. Here, we investigate the level of diversity and genomic features (genome size, GC content, replication strand skew, and codon usage bias) from complete genomes of bacteria commonly identified in the BE, providing a first step towards understanding these bacterial lifestyles. RESULTS Here, we selected bacterial genera commonly identified in the BE (or "Common BE genomes") and compared them against other prokaryotic genera ("Other genomes"). The "Common BE genomes" were identified in various climates and in indoor, outdoor, underground, or extreme built environments. The diversity level of the 16S rRNA varied greatly between genera. The genome size, GC content and GC skew strength of the "Common BE genomes" were statistically larger than those of the "Other genomes" but were not practically significant. In contrast, the strength of selected codon usage bias (S value) was statistically higher with a large effect size in the "Common BE genomes" compared to the "Other genomes." CONCLUSION Of the four genomic features tested, the S value could play a more important role in understanding the lifestyles of bacteria living in the BE. This parameter could be indicative of bacterial growth rates, gene expression, and other factors, potentially affected by BE growth conditions (e.g., temperature, humidity, and nutrients). However, further experimental evidence, species-level BE studies, and classification by BE location is needed to define the relationship between genomic features and the lifestyles of BE bacteria more robustly.
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Affiliation(s)
- Nancy Merino
- Earth-Life Science Institute, Tokyo Institute of Technology, Ookayama, Meguro-ku, Tokyo, 152-8550, Japan.,Department of Earth Sciences, University of Southern California, Stauffer Hall of Science, Los Angeles, CA, 90089, USA
| | - Shu Zhang
- Global Research Center for Environment and Energy based on Nanomaterials Science, National Institute for Material Science, 1-1 Namiki, Tsukuba, Ibaraki, 305-0044, Japan.,Section of Infection and Immunity, Herman Ostrow School of Dentistry of USC, University of Southern California, Los Angeles, CA, 90089-0641, USA
| | - Masaru Tomita
- Faculty of Environment and Information Studies, Keio University, Fujisawa, Kanagawa, 252-0882, Japan.,Institute for Advanced Biosciences, Keio University, Tsuruoka, Yamagata, 997-0035, Japan
| | - Haruo Suzuki
- Faculty of Environment and Information Studies, Keio University, Fujisawa, Kanagawa, 252-0882, Japan. .,Institute for Advanced Biosciences, Keio University, Tsuruoka, Yamagata, 997-0035, Japan.
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20
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Park CE, Jeong NY, Yang MJ, Kim HW, Joo SI, Kim KH, Seong HK, Hwang YY, Lim HM, Son JC, Yoon SH, Yoon NS, Jang IH. Study on the Standardization of a Surveillance Culture Laboratory in Infection Control Fields. KOREAN JOURNAL OF CLINICAL LABORATORY SCIENCE 2018. [DOI: 10.15324/kjcls.2018.50.3.359] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022] Open
Affiliation(s)
- Chang-Eun Park
- Department of Biomedical Laboratory Science, Molecular Diagnostics Research Institute, Namseoul University, Cheonan, Korea
| | - Na-Yeon Jeong
- Infection Control Office, Samsung Medical Center, Seoul, Korea
| | - Min-Ji Yang
- Department of Laboratory Medicine, Seoul National University Hospital, Seoul, Korea
| | - Han-Wool Kim
- Infection Control Office, Pusan National University Hospital, Busan, Korea
| | - Sei-Ick Joo
- Department of Biomedical Laboratory Science, Daejeon University, Daejeon, Korea
| | - Keon-Han Kim
- Department of Laboratory Medicine, Gangnam Severance Hospital, Seoul, Korea
| | - Hee-Kyung Seong
- Department of Biomedical Laboratory Science, Dong-Eui Institute of Technology, Busan, Korea
| | - Yu-Yean Hwang
- Department of Laboratory Medicine, Samsung Medical Center, Seoul, Korea
| | - Hyun-Mi Lim
- Department of Laboratory Medicine, Soonchunhyang University Hospital, Seoul, Korea
| | - Jae-Cheol Son
- Department of Pulmonology, Chungbuk National University Hospital, Cheongju, Korea
| | | | - Nam-Seob Yoon
- Department of Laboratory Medicine, Asan Medical Center, Seoul, Korea
| | - In-Ho Jang
- Department of Biomedical Laboratory Science, SangJi University, Wonju, Korea
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21
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Li Q, Wang H, Xu Y, Bai X, Wang J, Zhang Z, Liu X, Miao Y, Zhang L, Li X, Zou N, Yan G, Chen X, Zhang J, Fu S, Fan R, Xu J, Li J, Xiong Y. Multidrug-Resistant Escherichia albertii: Co-occurrence of β-Lactamase and MCR-1 Encoding Genes. Front Microbiol 2018; 9:258. [PMID: 29503643 PMCID: PMC5820351 DOI: 10.3389/fmicb.2018.00258] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/02/2017] [Accepted: 02/01/2018] [Indexed: 01/21/2023] Open
Abstract
Escherichia albertii is an emerging member of the Enterobacteriaceae causing human and animal enteric infections. Antimicrobial resistance among enteropathogens has been reported to be increasing in the past years. The purpose of this study was to investigate antibiotic resistance and resistance genes in E. albertii isolated from Zigong city, Sichuan province, China. The susceptibility to 21 antimicrobial agents was determined by Kirby-Bauer disk diffusion method. The highest prevalence was tetracycline resistance with a rate of 62.7%, followed by resistance to nalidixic acid and streptomycin with a rate of 56.9 and 51.0%, respectively. All isolates were sensitive or intermediate susceptible to imipenem, meropenem, amoxicillin-clavulanic acid, and levofloxacin. Among 51 E. albertii isolates, 15 were extended-spectrum β-lactamase-producing as confirmed by the double disk test. The main β-lactamase gene groups, i.e., blaTEM, blaSHV, and blaCTX-M, were detected in17, 20, and 22 isolates, respectively. Furthermore, four colistin-resistant isolates with minimum inhibitory concentrations of 8 mg/L were identified. The colistin-resistant isolates all harbored mcr-1 and blaCTX-M-55. Genome sequencing showed that E. albertii strain SP140150 carried mcr-1 and blaCTX-M-55 in two different plasmids. This study provided significant information regarding antibiotic resistance profiles and identified the co-occurrence of β-lactamase and MCR-1 encoding genes in E. albertii isolates.
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Affiliation(s)
- Qun Li
- Zigong Center for Disease Control and Prevention, Zigong, China
| | - Hong Wang
- Zigong Center for Disease Control and Prevention, Zigong, China
| | - Yanmei Xu
- Collaborative Innovation Center for Diagnosis and Treatment of Infectious Diseases, State Key Laboratory of Infectious Disease Prevention and Control, National Institute for Communicable Disease Control and Prevention, Chinese Center for Disease Control and Prevention, Beijing, China
| | - Xiangning Bai
- Collaborative Innovation Center for Diagnosis and Treatment of Infectious Diseases, State Key Laboratory of Infectious Disease Prevention and Control, National Institute for Communicable Disease Control and Prevention, Chinese Center for Disease Control and Prevention, Beijing, China
| | - Jianping Wang
- Collaborative Innovation Center for Diagnosis and Treatment of Infectious Diseases, State Key Laboratory of Infectious Disease Prevention and Control, National Institute for Communicable Disease Control and Prevention, Chinese Center for Disease Control and Prevention, Beijing, China
| | - Zhengdong Zhang
- Zigong Center for Disease Control and Prevention, Zigong, China
| | - Xiang Liu
- Zigong Center for Disease Control and Prevention, Zigong, China
| | - Yimao Miao
- Zigong Center for Disease Control and Prevention, Zigong, China
| | - Ling Zhang
- Zigong Center for Disease Control and Prevention, Zigong, China
| | - Xinqiong Li
- Zigong Center for Disease Control and Prevention, Zigong, China
| | - Nianli Zou
- Zigong Center for Disease Control and Prevention, Zigong, China
| | - Guodong Yan
- Zigong Center for Disease Control and Prevention, Zigong, China
| | - Xi Chen
- Zigong Center for Disease Control and Prevention, Zigong, China
| | - Jie Zhang
- Zigong Center for Disease Control and Prevention, Zigong, China
| | - Shanshan Fu
- Collaborative Innovation Center for Diagnosis and Treatment of Infectious Diseases, State Key Laboratory of Infectious Disease Prevention and Control, National Institute for Communicable Disease Control and Prevention, Chinese Center for Disease Control and Prevention, Beijing, China
| | - Ruyue Fan
- Collaborative Innovation Center for Diagnosis and Treatment of Infectious Diseases, State Key Laboratory of Infectious Disease Prevention and Control, National Institute for Communicable Disease Control and Prevention, Chinese Center for Disease Control and Prevention, Beijing, China
| | - Jianguo Xu
- Collaborative Innovation Center for Diagnosis and Treatment of Infectious Diseases, State Key Laboratory of Infectious Disease Prevention and Control, National Institute for Communicable Disease Control and Prevention, Chinese Center for Disease Control and Prevention, Beijing, China
| | - Juan Li
- Collaborative Innovation Center for Diagnosis and Treatment of Infectious Diseases, State Key Laboratory of Infectious Disease Prevention and Control, National Institute for Communicable Disease Control and Prevention, Chinese Center for Disease Control and Prevention, Beijing, China
| | - Yanwen Xiong
- Collaborative Innovation Center for Diagnosis and Treatment of Infectious Diseases, State Key Laboratory of Infectious Disease Prevention and Control, National Institute for Communicable Disease Control and Prevention, Chinese Center for Disease Control and Prevention, Beijing, China
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Grillová L, Sedláček I, Páchníková G, Staňková E, Švec P, Holochová P, Micenková L, Bosák J, Slaninová I, Šmajs D. Characterization of four Escherichia albertii isolates collected from animals living in Antarctica and Patagonia. J Vet Med Sci 2017; 80:138-146. [PMID: 29249728 PMCID: PMC5797873 DOI: 10.1292/jvms.17-0492] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023] Open
Abstract
Escherichia albertii is a recently discovered species with a limited number of well characterized strains. The aim of this study was to characterize four of the E. albertii strains, which were among 41 identified Escherichia strains isolated from the feces of living animals on James Ross Island, Antarctica, and Isla Magdalena, Patagonia. Sequencing of 16S rDNA, automated ribotyping, and rep-PCR were used to identify the four E. albertii isolates. Phylogenetic analyses based on multi-locus sequence typing showed these isolates to be genetically most similar to the members of E. albertii phylogroup G3. These isolates encoded several virulence factors including those, which are characteristic of E. albertii (cytolethal distending toxin and intimin) as well as bacteriocin determinants that typically have a very low prevalence in E. coli strains (D, E7). Moreover, E. albertii protein extracts caused cell cycle arrest in human cell line A375, probably because of cytolethal distending toxin activity.
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Affiliation(s)
- Linda Grillová
- Department of Biology, Faculty of Medicine, Masaryk University, 625 00, Brno, Czech Republic
| | - Ivo Sedláček
- Czech Collection of Microorganisms, Department of Experimental Biology, Faculty of Science, Masaryk University, 625 00, Brno, Czech Republic
| | - Gabriela Páchníková
- Department of Biology, Faculty of Medicine, Masaryk University, 625 00, Brno, Czech Republic
| | - Eva Staňková
- Czech Collection of Microorganisms, Department of Experimental Biology, Faculty of Science, Masaryk University, 625 00, Brno, Czech Republic
| | - Pavel Švec
- Czech Collection of Microorganisms, Department of Experimental Biology, Faculty of Science, Masaryk University, 625 00, Brno, Czech Republic
| | - Pavla Holochová
- Czech Collection of Microorganisms, Department of Experimental Biology, Faculty of Science, Masaryk University, 625 00, Brno, Czech Republic
| | - Lenka Micenková
- Research Centre for Toxic Compounds in the Environment, Faculty of Science, Masaryk University, 625 00, Brno, Czech Republic
| | - Juraj Bosák
- Department of Biology, Faculty of Medicine, Masaryk University, 625 00, Brno, Czech Republic
| | - Iva Slaninová
- Department of Biology, Faculty of Medicine, Masaryk University, 625 00, Brno, Czech Republic
| | - David Šmajs
- Department of Biology, Faculty of Medicine, Masaryk University, 625 00, Brno, Czech Republic
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Gulati P, Ghosh M. Biofilm forming ability of Sphingomonas paucimobilis isolated from community drinking water systems on plumbing materials used in water distribution. JOURNAL OF WATER AND HEALTH 2017; 15:942-954. [PMID: 29215358 DOI: 10.2166/wh.2017.294] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
Sphingomonas paucimobilis, an oligotroph, is well recognized for its potential for biofilm formation. The present study explored the biofilm forming ability of a strain isolated from municipal drinking water on plumbing materials. The intensity of biofilm formation of this strain on different plumbing materials was examined by using 1 × 1 cm2 pieces of six different pipe materials, i.e. polyvinyl chloride (PVC), polypropylene (PP), polyethylene (PE), aluminium (Al), copper (Cu) and rubber (R) and observing by staining with the chemical chromophore, Calcofluor. To understand whether biofilm formation occurs under flow through conditions, a laboratory-scale simulated distribution system, comprised of the above materials was fabricated. Biofilm samples were collected from the designed system at different biofilm ages (10, 40 and 90 hours old) and enumerated. The results indicated that the biofilm formation occurred on all plumbing materials with Cu and R as exceptions. The intensity of biofilm formation was found to be maximum on PVC followed by PP and PE. We also demonstrated the chemical chromophore (Calcofluor) successfully for rapid and easy visual detection of biofilms, validated by scanning electron microscope (SEM) analysis of the plumbing materials. Chlorination has little effect in preventing biofilm development.
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Affiliation(s)
- Parul Gulati
- Department of Biotechnology, Thapar Institute of Engineering and Technology, Patiala 147004, India E-mail:
| | - Moushumi Ghosh
- Department of Biotechnology, Thapar Institute of Engineering and Technology, Patiala 147004, India E-mail:
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24
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Multidrug Resistant Enteric Bacterial Pathogens in a Psychiatric Hospital in Ghana: Implications for Control of Nosocomial Infections. Int J Microbiol 2017; 2017:9509087. [PMID: 29038662 PMCID: PMC5606046 DOI: 10.1155/2017/9509087] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/24/2017] [Accepted: 08/01/2017] [Indexed: 01/24/2023] Open
Abstract
Enteric bacteria are commonly implicated in hospital-acquired or nosocomial infections. In Ghana, these infections constitute an important public health problem but little is known about their contribution to antibiotic resistance. The aim of the study was to determine the extent and pattern of antibiotic resistance of enteric bacteria isolated from patients and environmental sources at the Accra Psychiatric Hospital. A total of 265 samples were collected from the study site including 142 stool and 82 urine samples from patients, 7 swab samples of door handle, and 3 samples of drinking water. Enteric bacteria were isolated using standard microbiological methods. Antibiograms of the isolates were determined using the disc diffusion method. Overall, 232 enteric bacteria were isolated. Escherichia coli was the most common (38.3%), followed by Proteus (19.8%), Klebsiella (17.7%), Citrobacter (14.7%), Morganella (8.2%), and Pseudomonas (1.3%). All isolates were resistant to ampicillin but sensitive to cefotaxime. The resistance ranged from 15.5% to 84.5%. Multidrug resistance was most prevalent (100%) among isolates of Proteus and Morganella and least prevalent among isolates of Pseudomonas (33.3%). Multidrug resistance among enteric bacteria at the study hospital is high and hence there is a need for screening before therapy to ensure prudent use of antibiotics.
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Jones-Ibarra AM, Wall KR, Vuia-Riser J, Kerth CR, Castillo A, Taylor TM. Escherichia albertii Inactivation following l-Lactic Acid Exposure or Cooking in Ground Beef. J Food Prot 2016; 79:1475-1481. [PMID: 28221930 DOI: 10.4315/0362-028x.jfp-15-487] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
Escherichia albertii is an emerging foodborne pathogen recovered from young children and adults exhibiting symptoms of gastroenteritis via pathogenesis factors including attaching and effacing lesions, cytolethal distending toxin, and Shiga toxin variants. Study objectives were to determine E. albertii survival following (i) exposure to lactic acid as a function of solution pH and incubation period and (ii) cooking ground beef patties to different endpoint temperatures. E. albertii was incubated in phosphate buffer containing 3.0% l-lactic acid adjusted to pH 3.0, 4.0, 5.0, or 7.0; survivors were determined every 30 min for 150 min. Ground beef patties (80% lean) were cooked to temperature endpoints simulating undercooking (62°C), the minimum temperature for safe cooking (71.1°C), and cooking to well done (76°C). Maximal pathogen reduction was observed after a 30-min exposure to pH 3.0 l-lactic acid. Reductions of 3.9, 4.4, and 4.9 log CFU/g were obtained following cooking ground beef patties to 62, 71.1, and 76°C, respectively, but the reductions did not differ as a function of the endpoint cooking temperature (P ≥ 0.05). E. albertii may be controlled on beef through the proper application of antimicrobial interventions and cooking.
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Affiliation(s)
- Amie M Jones-Ibarra
- Department of Nutrition and Food Science, Texas A&M University, College Station, Texas 77843, USA
| | - Kayley R Wall
- Department of Animal Science, Texas A&M University, College Station, Texas 77843, USA
| | - Jennifer Vuia-Riser
- Department of Nutrition and Food Science, Texas A&M University, College Station, Texas 77843, USA
| | - Chris R Kerth
- Department of Animal Science, Texas A&M University, College Station, Texas 77843, USA
| | - Alejandro Castillo
- Department of Animal Science, Texas A&M University, College Station, Texas 77843, USA
| | - T Matthew Taylor
- Department of Nutrition and Food Science, Texas A&M University, College Station, Texas 77843, USA
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26
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Multidrug-Resistant Bacteria Isolated from Surface Water in Bassaseachic Falls National Park, Mexico. INTERNATIONAL JOURNAL OF ENVIRONMENTAL RESEARCH AND PUBLIC HEALTH 2016; 13:ijerph13060597. [PMID: 27322297 PMCID: PMC4924054 DOI: 10.3390/ijerph13060597] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 05/04/2016] [Revised: 06/03/2016] [Accepted: 06/07/2016] [Indexed: 11/16/2022]
Abstract
Bacterial pathogens are a leading cause of waterborne disease, and may result in gastrointestinal outbreaks worldwide. Inhabitants of the Bassaseachic Falls National Park in Chihuahua, Mexico show seasonal gastroenteritis problems. This aim of this study was to detect enteropathogenic microorganisms responsible for diarrheal outbreaks in this area. In 2013, 49 surface water samples from 13 selected sampling sites along the Basaseachi waterfall and its main rivers, were collected during the spring, summer, autumn, and winter seasons. Fecal and total coliform counts were determined using standard methods; the AutoScan-4 system was used for identification of isolates and the antibiotic resistance profile by challenging each organism using 21 antibiotics. Significant differences among seasons were detected, where autumn samples resulted in the highest total (p < 0.05) and fecal (p < 0.001) coliform counts, whereas the lowest total coliform counts were recorded in spring. Significant differences between sampling sites were observed, where samples from sites 6, 8, and 11 had the highest total coliform counts (p < 0.009), whereas samples from site 9 exhibited the lowest one. From the microbiological analysis, 33 bacterial isolates from 13 different sites and four sampling seasons were selected; 53% of isolates were resistant to at least one antibiotic, and 15% exhibited a multidrug resistance (MDB) phenotype. MDB were identified as Klebsiella oxytoca (two out of four identified isolates), Escherichia coli (2/7), and Enterobacter cloacae (1/3). In addition, some water-borne microorganisms exhibited resistance to cefazoline, cefuroxime, ampicillin, and ampicillin-sulbactam. The presence of these microorganisms near rural settlements suggests that wastewater is the contamination source, providing one possible transmission mechanism for diarrheal outbreaks.
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27
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Ji P, Parks J, Edwards MA, Pruden A. Impact of Water Chemistry, Pipe Material and Stagnation on the Building Plumbing Microbiome. PLoS One 2015; 10:e0141087. [PMID: 26495985 PMCID: PMC4619671 DOI: 10.1371/journal.pone.0141087] [Citation(s) in RCA: 77] [Impact Index Per Article: 8.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/23/2015] [Accepted: 10/03/2015] [Indexed: 02/07/2023] Open
Abstract
A unique microbiome establishes in the portion of the potable water distribution system within homes and other buildings (i.e., building plumbing). To examine its composition and the factors that shape it, standardized cold water plumbing rigs were deployed at the treatment plant and in the distribution system of five water utilities across the U.S. Three pipe materials (copper with lead solder, CPVC with brass fittings or copper/lead combined pipe) were compared, with 8 hour flush cycles of 10 minutes to simulate typical daily use patterns. High throughput Illumina sequencing of 16S rRNA gene amplicons was employed to profile and compare the resident bulk water bacteria and archaea. The utility, location of the pipe rig, pipe material and stagnation all had a significant influence on the plumbing microbiome composition, but the utility source water and treatment practices were dominant factors. Examination of 21 water chemistry parameters suggested that the total chlorine concentration, pH, P, SO42- and Mg were associated with the most of the variation in bulk water microbiome composition. Disinfectant type exerted a notably low-magnitude impact on microbiome composition. At two utilities using the same source water, slight differences in treatment approaches were associated with differences in rare taxa in samples. For genera containing opportunistic pathogens, Utility C samples (highest pH of 9–10) had the highest frequency of detection for Legionella spp. and lowest relative abundance of Mycobacterium spp. Data were examined across utilities to identify a true universal core, special core, and peripheral organisms to deepen insight into the physical and chemical factors that shape the building plumbing microbiome.
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Affiliation(s)
- Pan Ji
- Via Department of Civil and Environmental Engineering, Virginia Tech, Blacksburg, Virginia, United States of America
| | - Jeffrey Parks
- Via Department of Civil and Environmental Engineering, Virginia Tech, Blacksburg, Virginia, United States of America
| | - Marc A. Edwards
- Via Department of Civil and Environmental Engineering, Virginia Tech, Blacksburg, Virginia, United States of America
| | - Amy Pruden
- Via Department of Civil and Environmental Engineering, Virginia Tech, Blacksburg, Virginia, United States of America
- * E-mail:
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28
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Prevalence of eae-positive, lactose non-fermenting Escherichia albertii from retail raw meat in China. Epidemiol Infect 2015; 144:45-52. [PMID: 26004066 DOI: 10.1017/s0950268815001120] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
Escherichia albertii is a newly emerging enteric pathogen that has been associated with gastroenteritis in humans. Recently, E. albertii has also been detected in healthy and sick birds, animals, chicken meat and water. In the present study, the prevalence and characteristics of the eae-positive, lactose non-fermenting E. albertii strains in retail raw meat in China were evaluated. Thirty isolates of such strains of E. albertii were identified from 446 (6·73%) samples, including duck intestines (21·43%, 6/28), duck meat (9·52%, 2/21), chicken intestines (8·99%, 17/189), chicken meat (5·66%, 3/53), mutton meat (4·55%, 1/22) and pork meat (2·44%, 1/41). None was isolated from 92 samples of raw beef meat. Strains were identified as E. albertii by phenotypic properties, diagnostic PCR, sequence analysis of the 16S rRNA gene, and housekeeping genes. Five intimin subtypes were harboured by these strains. All strains possessed the II/III/V subtype group of the cdtB gene, with two strains carrying another copy of the I/IV subtype group. Pulsed-field gel electrophoresis showed high genetic diversity of E. albertii in raw meats. Our findings indicate that E. albertii can contaminate various raw meats, posing a potential threat to public health.
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Maheux AF, Boudreau DK, Bergeron MG, Rodriguez MJ. Characterization of Escherichia fergusonii and Escherichia albertii isolated from water. J Appl Microbiol 2014; 117:597-609. [PMID: 24849008 DOI: 10.1111/jam.12551] [Citation(s) in RCA: 36] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/14/2014] [Revised: 05/16/2014] [Accepted: 05/17/2014] [Indexed: 11/28/2022]
Abstract
AIMS The aim of this study was to characterize Escherichia fergusonii and Escherichia albertii isolated from water. METHODS AND RESULTS The characterization of E. fergusonii and E. albertii isolated from water was determined using an Escherichia coli-specific uidA PCR, a tuf PCR, and with phylogenetic analysis using three housekeeping genes (adk, gyrB, and recA) from the E. coli MLST scheme, selected for their ability to discriminate among all Escherichia species. Among the 527 isolates tested, 25 (4·7%) were uidA PCR negative and tuf PCR positive. Phylogenetic analysis using adk, gyrB and recA genes showed that 6, 18 and 1 of these 25 non-E. coli Escherichia spp. isolates grouped with reference strains of E. fergusonii, E. albertii, and E. coli, respectively. Finally, the 25 non-E. coli Escherichia spp. strains isolated were investigated for the presence of pathogenic factors, comprising intimin (eae gene), cytolethal distending toxin (cdtB gene) and shiga toxin (stx gene). With the PCR primers used, the presence of eae and stx genes was not detected. However, cdtB genes types I/IV were detected for 3 (16·7%) E. albertii strains, whereas 15 of 18 (83·3%) possessed the cdtB gene types II/III/V. CONCLUSIONS These results showed that MLST scheme allows a more accurate identification of non-E. coli species than phenotypic tests. We also showed that E. fergusonii and E. albertii represent, respectively, 0·8 and 2·5% of all Escherichia species isolated and the pathogenic cdtB genes were present in 83·3% of these strains. SIGNIFICANCE AND IMPACT OF THE STUDY The data presented in this study provided an efficient way to correctly identify non-E. coli species contributing to our understanding of the risks associated with Escherichia species in water consumed by humans and animals. Furthermore, the results give an insight about the natural habitats of these species.
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Affiliation(s)
- A F Maheux
- Chaire de recherche en eau potable de l'Université Laval, Québec City, QC, Canada; École supérieure d'aménagement du territoire et de développement régional, Université Laval, Québec City, QC, Canada
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30
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Homonnay ZG, Török G, Makk J, Brumbauer A, Major É, Márialigeti K, Tóth E. Bacterial communities in the collection and chlorinated distribution sections of a drinking water system in Budapest, Hungary. J Basic Microbiol 2014; 54:729-38. [DOI: 10.1002/jobm.201300960] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/26/2013] [Accepted: 03/20/2014] [Indexed: 11/09/2022]
Affiliation(s)
- Zalán G. Homonnay
- Department of Microbiology; Eötvös Loránd University; Budapest Hungary
| | - György Török
- Department of Microbiology; Eötvös Loránd University; Budapest Hungary
| | - Judit Makk
- Department of Microbiology; Eötvös Loránd University; Budapest Hungary
| | - Anikó Brumbauer
- Water Quality and Environmental Protection Department; Waterworks of Budapest; Budapest Hungary
| | - Éva Major
- Water Quality and Environmental Protection Department; Waterworks of Budapest; Budapest Hungary
| | | | - Erika Tóth
- Department of Microbiology; Eötvös Loránd University; Budapest Hungary
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31
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Lin W, Yu Z, Zhang H, Thompson IP. Diversity and dynamics of microbial communities at each step of treatment plant for potable water generation. WATER RESEARCH 2014; 52:218-30. [PMID: 24268295 DOI: 10.1016/j.watres.2013.10.071] [Citation(s) in RCA: 93] [Impact Index Per Article: 9.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/13/2013] [Revised: 10/27/2013] [Accepted: 10/29/2013] [Indexed: 05/08/2023]
Abstract
The dynamics of bacterial and eukaryotic community associated with each step of a water purification plant in China was investigated using 454 pyrosequencing and qPCR based approaches. Analysis of pyrosequencing revealed that a high degree diversity of bacterial and eukaryotic communities is present in the drinking water treatment process before sand filtration. In addition, the microbial compositions of the biofilm in the sand filters and those of the water of the putatively clear tanks were distinct, suggesting that sand filtration and chlorination treatments played primary roles in removing exposed microbial communities. Potential pathogens including Acinetobacter, Clostridium, Legionella, and Mycobacterium, co-occurred with protozoa such as Rhizopoda (Hartmannellidae), and fungi such as Penicillium and Aspergillus. Furthermore, this study supported the ideas based on molecular level that biofilm communities were different from those in corresponding water samples, and that the concentrations of Mycobacterium spp., Legionella spp., and Naegleria spp. in the water samples declined with each step of the water treatment process by qPCR. Overall, this study provides the first detailed evaluation of bacterial and eukaryotic diversity at each step of an individual potable water treatment process located in China.
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Affiliation(s)
- Wenfang Lin
- College of Resources and Environment, University of Chinese Academy of Sciences, 19 A Yuquan Road, Shijingshan District, Beijing 100049, PR China
| | - Zhisheng Yu
- College of Resources and Environment, University of Chinese Academy of Sciences, 19 A Yuquan Road, Shijingshan District, Beijing 100049, PR China; Department of Engineering Science, University of Oxford, Parks Road, Oxford OX1 3PJ, UK.
| | - Hongxun Zhang
- College of Resources and Environment, University of Chinese Academy of Sciences, 19 A Yuquan Road, Shijingshan District, Beijing 100049, PR China
| | - Ian P Thompson
- Department of Engineering Science, University of Oxford, Parks Road, Oxford OX1 3PJ, UK
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32
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Buse HY, Lu J, Lu X, Mou X, Ashbolt NJ. Microbial diversities (16S and 18S rRNA gene pyrosequencing) and environmental pathogens within drinking water biofilms grown on the common premise plumbing materials unplasticized polyvinylchloride and copper. FEMS Microbiol Ecol 2014; 88:280-95. [PMID: 24490699 DOI: 10.1111/1574-6941.12294] [Citation(s) in RCA: 59] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/23/2013] [Revised: 01/08/2014] [Accepted: 01/23/2014] [Indexed: 11/29/2022] Open
Abstract
Drinking water (DW) biofilm communities influence the survival of opportunistic pathogens, yet knowledge about the microbial composition of DW biofilms developed on common in-premise plumbing material is limited. Utilizing 16S and 18S rRNA gene pyrosequencing, this study characterized the microbial community structure within DW biofilms established on unplasticized polyvinyl chloride (uPVC) and copper (Cu) surfaces and the impact of introducing Legionella pneumophila (Lp) and Acanthamoeba polyphaga. Mature (> 1 year old) biofilms were developed before inoculation with sterilized DW (control, Con), Lp, or Lp and A. polyphaga (LpAp). Comparison of uPVC and Cu biofilms indicated significant differences between bacterial (P = 0.001) and eukaryotic (P < 0.01) members attributable to the unique presence of several family taxa: Burkholderiaceae, Characeae, Epistylidae, Goniomonadaceae, Paramoebidae, Plasmodiophoridae, Plectidae, Sphenomonadidae, and Toxariaceae within uPVC biofilms; and Enterobacteriaceae, Erythrobacteraceae, Methylophilaceae, Acanthamoebidae, and Chlamydomonadaceae within Cu biofilms. Introduction of Lp alone or with A. polyphaga had no effect on bacterial community profiles (P > 0.05) but did affect eukaryotic members (uPVC, P < 0.01; Cu, P = 0.001). Thus, established DW biofilms host complex communities that may vary based on substratum matrix and maintain consistent bacterial communities despite introduction of Lp, an environmental pathogen.
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Narciso-da-Rocha C, Vaz-Moreira I, Manaia CM. Genotypic diversity and antibiotic resistance in Sphingomonadaceae isolated from hospital tap water. THE SCIENCE OF THE TOTAL ENVIRONMENT 2014; 466-467:127-135. [PMID: 23892027 DOI: 10.1016/j.scitotenv.2013.06.109] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/03/2013] [Revised: 06/26/2013] [Accepted: 06/26/2013] [Indexed: 06/02/2023]
Abstract
The aim of this study was to infer about the modes and extent of dispersion of Sphingomonadaceae via tap water. Sphingomonadaceae isolated from tap water samples in different places of a hospital were compared, based on intra-species genetic variability and antibiotic resistance phenotypes. These isolates were also compared with others isolated before from houses and dental chairs, served by the same municipal water supply system. Sphingomonadaceae from hospital tap water comprised members of the genera Sphingomonas, Sphingobium, Novosphingobium and Blastomonas. In general, distinct genotypes of Sphingomonadaceae were detected in different hospital areas and in tap water outside the hospital, suggesting these bacteria are not persistent or widespread in the urban water distribution system. Possible intrinsic antibiotic resistance, observed in most or all members of the family or of a genus, was observed for colistin in Sphingomonadaceae, aminoglycosides in the genus Blastomonas and beta-lactams in the genus Sphingobium. Possible acquired resistance phenotypes, not common to all members of a given species, comprised fluoroquinolones, cephalosporins and sulphonamides. Although the potential of Sphingomonadaceae as opportunistic pathogens may be low, the capacity of these bacteria to thrive in water supply systems, combined with the intrinsic or acquired antibiotic resistance, may raise the risk associated with their occurrence in hospital tap water.
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Affiliation(s)
- Carlos Narciso-da-Rocha
- CBQF - Centro de Biotecnologia e Química Fina - Laboratório Associado, Escola Superior de Biotecnologia, Universidade Católica Portuguesa/Porto, Rua Dr. António Bernardino Almeida, Porto 4200-072, Portugal
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Marzano MA, Balzaretti CM. Protecting child health by preventing school-related foodborne illnesses: Microbiological risk assessment of hygiene practices, drinking water and ready-to-eat foods in Italian kindergartens and schools. Food Control 2013. [DOI: 10.1016/j.foodcont.2013.05.031] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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Nimri LF. Escherichia albertii, a newly emerging enteric pathogen with poorly defined properties. Diagn Microbiol Infect Dis 2013; 77:91-5. [PMID: 23938305 DOI: 10.1016/j.diagmicrobio.2013.06.028] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/23/2013] [Revised: 06/13/2013] [Accepted: 06/21/2013] [Indexed: 10/26/2022]
Abstract
Escherichia albertii is a newly emerging enteric pathogen that has been associated with sporadic infections among humans and birds. Selected coliform isolates were screened for allelic variation in 2 housekeeping genes (lysP and mdh) specific for E. albertii. The 48 strains that were identified as E. albertii were tested for 15 virulence markers and biochemical and serogical properties. All E. albertii strains were non-motile, fermented D-glucose (with gas), D-mannitol, and D-mannose, but failed to ferment lactose and other sugars. Variable positive reactions were noted for other tests. Most strains were rough or failed to agglutinate with Shigella boydii 13 antisera and E. coli antisera with few exceptions. All strains were positive for the eaeA gene, and variable numbers were positive for the cdtB, phoE, ehxA, and stx2f genes. Results illustrate the variability extent within this lineage and highlight the importance of accurately distinguishing it within the genus Escherichia and including information within commercial databases to improve their identification.
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Affiliation(s)
- Laila F Nimri
- Department of Medical Laboratory Sciences, Jordan University of Science and Technology, Irbid, Jordan.
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Identification of opportunistic pathogenic bacteria in drinking water samples of different rural health centers and their clinical impacts on humans. BIOMED RESEARCH INTERNATIONAL 2013; 2013:348250. [PMID: 23862144 PMCID: PMC3686054 DOI: 10.1155/2013/348250] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 03/01/2013] [Revised: 04/22/2013] [Accepted: 04/24/2013] [Indexed: 11/17/2022]
Abstract
International drinking water quality monitoring programs have been established in order to prevent or to reduce the risk of contracting water-related infections. A survey was performed on groundwater-derived drinking water from 13 different hospitals in the Mahabubnagar District. A total of 55 bacterial strains were isolated which belonged to both gram-positive and gram-negative bacteria. All the taxa were identified based on the 16S rRNA gene sequence analysis based on which they are phylogenetically close to 27 different taxa. Many of the strains are closely related to their phylogenetic neighbors and exhibit from 98.4 to 100% sequence similarity at the 16S rRNA gene sequence level. The most common group was similar to Acinetobacter junii (21.8%) and Acinetobacter calcoaceticus (10.9%) which were shared by 7 and 5 water samples, respectively. Out of 55 isolates, only 3 isolates belonged to coliform group which are Citrobacter freundii and Pantoea anthophila. More than half (52.7%, 29 strains) of the phylogenetic neighbors which belonged to 12 groups were reported to be pathogenic and isolated from clinical specimens. Out of 27 representative taxa are affiliated have eight representative genera in drinking water except for those affiliated with the genera Exiguobacterium, Delftia, Kocuria, and Lysinibacillus.
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Zeng DN, Fan ZY, Chi L, Wang X, Qu WD, Quan ZX. Analysis of the bacterial communities associated with different drinking water treatment processes. World J Microbiol Biotechnol 2013; 29:1573-84. [PMID: 23515963 DOI: 10.1007/s11274-013-1321-5] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/31/2012] [Accepted: 03/12/2013] [Indexed: 10/27/2022]
Abstract
A drinking water plant was surveyed to determine the bacterial composition of different drinking water treatment processes (DWTP). Water samples were collected from different processing steps in the plant (i.e., coagulation, sedimentation, sand filtration, and chloramine disinfection) and from distantly piped water. The samples were pyrosequensed using sample-specific oligonucleotide barcodes. The taxonomic composition of the microbial communities of different DWTP and piped water was dominated by the phylum Proteobacteria. Additionally, a large proportion of the sequences were assigned to the phyla Actinobacteria and Bacteroidetes. The piped water exhibited increasing taxonomic diversity, including human pathogens such as the Mycobacterium, which revealed a threat to the safety of drinking water. Surprisingly, we also found that a sister group of SAR11 (LD12) persisted throughout the DWTP, which was always detected in freshwater aquatic systems. Moreover, Polynucleobacter, Rhodoferax, and a group of Actinobacteria, hgcI clade, were relatively consistent throughout the processes. It is concluded that smaller-size microorganisms tended to survive against the present treatment procedure. More improvement should be made to ensure the long-distance transmission drinking water.
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Affiliation(s)
- Dan-Ning Zeng
- Department of Microbiology and Microbial Engineering, School of Life Sciences, Fudan University, Shanghai 200433, China
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Molecular characterization of natural biofilms from household taps with different materials: PVC, stainless steel, and cast iron in drinking water distribution system. Appl Microbiol Biotechnol 2012; 97:8393-401. [DOI: 10.1007/s00253-012-4557-3] [Citation(s) in RCA: 43] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/03/2012] [Revised: 10/25/2012] [Accepted: 10/27/2012] [Indexed: 11/26/2022]
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Gombos E, Felföldi T, Barkács K, Vértes C, Vajna B, Záray G. Ferrate treatment for inactivation of bacterial community in municipal secondary effluent. BIORESOURCE TECHNOLOGY 2012; 107:116-121. [PMID: 22217734 DOI: 10.1016/j.biortech.2011.12.053] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/05/2011] [Revised: 12/07/2011] [Accepted: 12/10/2011] [Indexed: 05/31/2023]
Abstract
This paper demonstrates the effect of ferrate [Fe(VI)-compound], an environmental friendly multi-purpose reagent, in municipal secondary effluent treatment. The purpose was to study the inactivation capability of ferrate and for the first time to compare the effect and efficiency of Fe(VI) with the widely used disinfectant, chlorine gas on the indigenous bacterial community in the case of secondary effluents. The most probable number technique (MPN) was applied for the determination of cultivable heterotrophic bacterial abundance and terminal restriction fragment length polymorphism (T-RFLP) analysis for comparing bacterial communities. The study demonstrated that (i) ferrate and chlorine had different effect on the total bacterial community of secondary effluents, (ii) low ferrate dose [5 mg L(-1) Fe(VI)] was sufficient for >99.9% reduction of indigenous bacteria, and (iii) a similar dosage was also effective in the inactivation of chlorine-resistant bacteria.
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Affiliation(s)
- Erzsébet Gombos
- Cooperative Research Center for Environmental Sciences, Eötvös Loránd University, Pázmány Péter sétány 1/A, H-1117 Budapest, Hungary
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Marzano M, Balzaretti C. Cook-serve method in mass catering establishments: Is it still appropriate to ensure a high level of microbiological quality and safety? Food Control 2011. [DOI: 10.1016/j.foodcont.2011.04.024] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
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Marzano M, Ripamonti B, Balzaretti C. Monitoring the bacteriological quality of Italian bottled spring water from dispensers. Food Control 2011. [DOI: 10.1016/j.foodcont.2010.06.014] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Felföldi T, Tarnóczai T, Homonnay ZG. Presence of potential bacterial pathogens in a municipal drinking water supply system. Acta Microbiol Immunol Hung 2010; 57:165-79. [PMID: 20870589 DOI: 10.1556/amicr.57.2010.3.2] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
The quality of drinking water is a major public concern, but the detection of most potential pathogens is not always included in drinking water hygienic monitoring or is only assessed with highly biased cultivation-based methods. In this study, the occurrence of Pseudomonas aeruginosa and Legionella spp. was examined with taxon-specific PCRs in samples taken at ten points of a municipal drinking water supply system in three months. Sequence analysis confirmed the positivity of samples and revealed a diverse community of legionellae. The results showed that chlorination was an important and effective disinfection method against pathogenic bacteria in drinking water, but pathogenic bacteria could reoccur in the system farther away from the chlorination point. No strong correlation was found between the presence of the investigated potentially pathogenic bacteria and the measured abiotic and biotic parameters within the investigated range. It is hypothesized that instead of physicochemical parameters, the main factors influencing the presence of pathogens in the drinking water were rather the composition of the microbial community, the biotic interactions between individual non-pathogenic and pathogenic microorganisms (competition or promotion of growth) and the structure of biofilm grown on the inner surface of the supply system.
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Affiliation(s)
- T Felföldi
- Eötvös Loránd University, Department of Microbiology, Pázmány Péter stny. 1/C, H-1117 Budapest, Hungary.
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