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Ma C, Zhou F, Lu D, Xu S, Luo J, Gan H, Gao D, Yao Z, He W, Kurup PU, Zhu DZ. Quantification and cultivation of Helicobacter pylori (H. pylori) from various urban water environments: A comprehensive analysis of precondition methods and sample characteristics. ENVIRONMENT INTERNATIONAL 2024; 187:108683. [PMID: 38735073 DOI: 10.1016/j.envint.2024.108683] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/01/2024] [Revised: 04/15/2024] [Accepted: 04/21/2024] [Indexed: 05/14/2024]
Abstract
Substantial evidence suggests that all types of water, such as drinking water, wastewater, surface water, and groundwater, can be potential sources of Helicobacter pylori (H. pylori) infection. Thus, it is critical to thoroughly investigate all possible preconditioning methods to enhance the recovery of H. pylori, improve the reproducibility of subsequent detection, and optimize the suitability for various water types and different detection purposes. In this study, we proposed and evaluated five distinct preconditioning methods for treating water samples collected from multiple urban water environments, aiming to maximize the quantitative qPCR readouts and achieve effective selective cultivation. According to the experimental results, when using the qPCR technique to examine WWTP influent, effluent, septic tank, and wetland water samples, the significance of having a preliminary cleaning step becomes more evident as it can profoundly influence qPCR detection results. In contrast, the simple, straightforward membrane filtration method could perform best when isolating and culturing H. pylori from all water samples. Upon examining the cultivation and qPCR results obtained from groundwater samples, the presence of infectious H. pylori (potentially other pathogens) in aquifers must represent a pressing environmental emergency demanding immediate attention. Furthermore, we believe groundwater can be used as a medium to reflect the H. pylori prevalence in a highly populated community due to its straightforward analytical matrix, consistent detection performance, and minimal interferences from human activities, temperature, precipitation, and other environmental fluctuations.
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Affiliation(s)
- Chen Ma
- School of Civil & Environmental Engineering and Geography Science, Ningbo University, Ningbo 315211, China
| | - Fangyuan Zhou
- School of Civil & Environmental Engineering and Geography Science, Ningbo University, Ningbo 315211, China
| | - Dingnan Lu
- School of Civil & Environmental Engineering and Geography Science, Ningbo University, Ningbo 315211, China; Department of Civil and Environmental Engineering, University of Massachusetts Lowell, One University Ave., Lowell, MA 01854, USA; Institute of Ocean Engineering, Ningbo University, Ningbo 315211, China.
| | - Shengliang Xu
- Ningbo Municipal Engineering Construction Group Co., 315000, China
| | - Jiayue Luo
- School of Civil & Environmental Engineering and Geography Science, Ningbo University, Ningbo 315211, China; Department of Civil and Environmental Engineering, University of Massachusetts Lowell, One University Ave., Lowell, MA 01854, USA; Institute of Ocean Engineering, Ningbo University, Ningbo 315211, China
| | - Huihui Gan
- School of Civil & Environmental Engineering and Geography Science, Ningbo University, Ningbo 315211, China; Department of Civil and Environmental Engineering, University of Massachusetts Lowell, One University Ave., Lowell, MA 01854, USA; Institute of Ocean Engineering, Ningbo University, Ningbo 315211, China
| | - Doudou Gao
- Ningbo Municipal Engineering Construction Group Co., 315000, China
| | - Zhiyuan Yao
- School of Civil & Environmental Engineering and Geography Science, Ningbo University, Ningbo 315211, China; Institute of Ocean Engineering, Ningbo University, Ningbo 315211, China
| | - Weidong He
- School of Civil & Environmental Engineering and Geography Science, Ningbo University, Ningbo 315211, China
| | - Pradeep U Kurup
- Department of Civil and Environmental Engineering, University of Massachusetts Lowell, One University Ave., Lowell, MA 01854, USA
| | - David Z Zhu
- School of Civil & Environmental Engineering and Geography Science, Ningbo University, Ningbo 315211, China; Institute of Ocean Engineering, Ningbo University, Ningbo 315211, China; Department of Civil and Environmental Engineering, University of Alberta, Edmonton, AB T6G 1H9, Canada
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Ekundayo TC, Swalaha FM, Ijabadeniyi OA. Socioeconomic indices guided linear mixed-effects and meta-regression modelling of the temporal, global and regional prevalence of Helicobacter pylori in environmental waters: A class I carcinogen. JOURNAL OF ENVIRONMENTAL MANAGEMENT 2023; 342:118282. [PMID: 37315468 DOI: 10.1016/j.jenvman.2023.118282] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/24/2023] [Revised: 05/04/2023] [Accepted: 05/26/2023] [Indexed: 06/16/2023]
Abstract
Environmental waters (EW) substantially lend to the transmission of Helicobacter pylori (Hp). But the increase in Hp infections and antimicrobial resistance is often attributed to socioeconomic status. The connection between socioeconomic status and Hp prevalence in EW is however yet to be investigated. This study aimed to assess the impacts of socioeconomic indices (SI: continent, world bank region (WBR), world bank income (WBI), WHO region, Socio-demographic Index (SDI quintile), Sustainable Development Index (SuDI), and Human Development Index (HDI)) on the prevalence of Hp in EW. Hp-EW data were fitted to a generalized linear mixed-effects model and SI-guided meta-regression models with a 1000-resampling test. The worldwide prevalence of Hp in EW was 21.76% [95% confidence interval [CI]: 10.29-40.29], which declined significantly from 59.52% [43.28-74.37] in 1990-99 to 19.36% [3.99-58.09] in 2010-19 and with increasing trend in 2020-22 (33.33%, 22.66-45.43). Hp prevalence in EW was highest in North America (45.12%, 17.07-76.66), then Europe (22.38%, 5.96-56.74), South America (22.09%, 13.76-33.49), Asia (2.98%, 0.02-85.17), and Africa (2.56%, 0.00-99.99). It was negligibly different among sampling settings, WBI, and WHO regions demonstrating highest prevalence in rural location [42.62%, 3.07-94.56], HIEs [32.82%, 13.19-61.10], and AMR [39.43%, 19.92-63.01], respectively. However, HDI, sample size, and microbiological method robustly predict Hp prevalence in EW justifying 26.08%, 21.15%, and 16.44% of the true difference, respectively. In conclusion, Hp is highly prevalence in EW across regional/socioeconomic strata and thus challenged the uses of socioeconomic status as surrogate for hygienic/sanitary practices in estimating Hp infection prevalence.
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Affiliation(s)
- Temitope C Ekundayo
- Department of Biotechnology and Food Science, Durban University of Technology, Steve Bike Campus, 121 Steve Biko Rd, Musgrave, Berea, 4001, Durban, South Africa.
| | - Feroz M Swalaha
- Department of Biotechnology and Food Science, Durban University of Technology, Steve Bike Campus, 121 Steve Biko Rd, Musgrave, Berea, 4001, Durban, South Africa
| | - Oluwatosin A Ijabadeniyi
- Department of Biotechnology and Food Science, Durban University of Technology, Steve Bike Campus, 121 Steve Biko Rd, Musgrave, Berea, 4001, Durban, South Africa
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Ekundayo TC, Swalaha FM, Ijabadeniyi OA. Global and regional prevalence of Helicobacter pylori in drinking waters: A sustainable, human development and socio-demographic indices based meta-regression-modelling. THE SCIENCE OF THE TOTAL ENVIRONMENT 2023; 861:160633. [PMID: 36481137 DOI: 10.1016/j.scitotenv.2022.160633] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/22/2022] [Revised: 11/27/2022] [Accepted: 11/28/2022] [Indexed: 06/17/2023]
Abstract
Helicobacter pylori (Hp) transmission dynamics via drinking water (DW) has a far much higher direct and indirect public health disease burden than previously thought. This study aimed to assess the global prevalence of Hp in DW, distributions across regions and socioeconomic indices (continent, world bank income, Human Development Index (HDI), Sustainable Development Index (SuDI), Socio-Demographic Index (SDI) quintile, and WHO regions). Hp-DW related data mined from five databases until 10/12/2022 according to PRISMA standard were quality-appraised and fitted to a generalized linear mixed-effects model. Sub-group analysis and meta-regression-modelling coupled with a 1000-permutation test (⁎) were conducted. The global prevalence of Hp in DW was 15.7% (95% confidence interval [CI]: 7.98-27.5), which varied significantly by sampling methods (Moore swabbing (61.0% [0.00-100.0]) vs. grab sampling (13.68%[6.99-25.04])) and detection technique (non-culture (21.35%[9.13-42.31]) vs. cultured-based methods (Psubgroup < 0.01)). The period 1990-99 had the highest prevalence (41.24% [0.02-99.97]). Regarding regional designations, Hp prevalence in DW was significantly different being highest in North America (61.82% [41.03-79.02]) by continents, AMR (42.66% [20.81-67.82]) by WHO group, high HDI (24.64% [10.98-46.43]) by HDI group and North America (61.90% [2.79-98.93]) by world bank region (Psubgroup < 0.01). Generally, sample preparation, SuDI grouping, and detection/confirmation techniques, have significant effects on the detection/prevalence of Hp in DW (Psubgroup < 0.01). Hp prevalence in DW was not significantly different among rural and urban DW (Psubgroup = 0.90), world bank income groups (Psubgroup = 0.15), and SDI quintiles (Psubgroup = 0.07). Among the predictors examined, only sample size (p < 0.1, R∗2(coefficient of determinant) = 15.29%), continent (p∗val = 0.04), HDI (p∗val = 0.02), HDI group (p∗val = 0.05), and microbiological methods (p < 0.1; R∗2=28.09 %) predicted Hp prevalence in DW robustly. In conclusion, Hp prevalence is still endemic in DW regardless of the regional designations/improve DW supplies.
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Affiliation(s)
- Temitope C Ekundayo
- Department of Biotechnology and Food Science, Durban University of Technology, Steve Biko Campus, 121 Steve Biko Rd, Musgrave, Berea, 4001 Durban, South Africa.
| | - Feroz M Swalaha
- Department of Biotechnology and Food Science, Durban University of Technology, Steve Biko Campus, 121 Steve Biko Rd, Musgrave, Berea, 4001 Durban, South Africa
| | - Oluwatosin A Ijabadeniyi
- Department of Biotechnology and Food Science, Durban University of Technology, Steve Biko Campus, 121 Steve Biko Rd, Musgrave, Berea, 4001 Durban, South Africa
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Duan M, Li Y, Liu J, Zhang W, Dong Y, Han Z, Wan M, Lin M, Lin B, Kong Q, Ding Y, Yang X, Zuo X, Li Y. Transmission routes and patterns of helicobacter pylori. Helicobacter 2023; 28:e12945. [PMID: 36645421 DOI: 10.1111/hel.12945] [Citation(s) in RCA: 8] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/10/2022] [Revised: 11/20/2022] [Accepted: 12/21/2022] [Indexed: 01/17/2023]
Abstract
BACKGROUND AND OBJECTIVE Helicobacter pylori (H. pylori), a gram-negative bacterium that colonizes the stomach, can cause chronic gastritis and peptic ulcers, as well as gastric cancer as a Class I carcinogen. However, the modes of H. pylori transmission are not clear. This review aims to clarify the transmission routes and patterns of H. pylori and identify efficacious prevention measures. METHODS Studies of H. pylori transmission were identified using PubMed, the Web of Science, and Cochrane Central; the retrieval deadline was October 2022. RESULTS The transmission routes of H. pylori are discussed, focusing on the five primary transmission routes, namely fecal-oral, oral-oral, gastric-oral, anal-oral, and genital-oral. We propose that H. pylori is contracted through multiple transmission routes. Additionally, we summarize the key transmission patterns of H. pylori, including person-to-person and animal-to-human transmission, as well as foodborne and occupational exposure. CONCLUSION Fecal-oral appears to be the most common H. pylori transmission routes. Although the oral-oral pathway is also important, the evidence does not support that this route of transmission is universal. The gastric-oral route occurs primarily in children and patients who are prone to vomiting. Meanwhile, the anal-oral and genital-oral routes remain hypothetical. Person-to-person and foodborne infections represent the predominant transmission patterns of H. pylori, whereas strong environmental and occupational limitations are associated with animal-to-human and occupational exposure.
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Affiliation(s)
- Miao Duan
- Department of Gastroenterology, Qilu Hospital of Shandong University, Jinan, China.,Laboratory of Translational Gastroenterology, Qilu Hospital of Shandong University, Jinan, China.,Robot Engineering Laboratory for Precise Diagnosis and Therapy of GI Tumor, Qilu Hospital of Shandong University, Jinan, China
| | - Yueyue Li
- Department of Gastroenterology, Qilu Hospital of Shandong University, Jinan, China.,Laboratory of Translational Gastroenterology, Qilu Hospital of Shandong University, Jinan, China.,Robot Engineering Laboratory for Precise Diagnosis and Therapy of GI Tumor, Qilu Hospital of Shandong University, Jinan, China
| | - Jing Liu
- Department of Gastroenterology, Qilu Hospital of Shandong University, Jinan, China.,Laboratory of Translational Gastroenterology, Qilu Hospital of Shandong University, Jinan, China.,Robot Engineering Laboratory for Precise Diagnosis and Therapy of GI Tumor, Qilu Hospital of Shandong University, Jinan, China
| | - Wenlin Zhang
- Department of Gastroenterology, Qilu Hospital of Shandong University, Jinan, China.,Laboratory of Translational Gastroenterology, Qilu Hospital of Shandong University, Jinan, China.,Robot Engineering Laboratory for Precise Diagnosis and Therapy of GI Tumor, Qilu Hospital of Shandong University, Jinan, China
| | - Yi Dong
- Center for Reproductive Medicine, Shandong University, Jinan, China
| | - Zhongxue Han
- Department of Gastroenterology, Qilu Hospital of Shandong University, Jinan, China.,Laboratory of Translational Gastroenterology, Qilu Hospital of Shandong University, Jinan, China.,Robot Engineering Laboratory for Precise Diagnosis and Therapy of GI Tumor, Qilu Hospital of Shandong University, Jinan, China
| | - Meng Wan
- Department of Gastroenterology, Qilu Hospital of Shandong University, Jinan, China.,Laboratory of Translational Gastroenterology, Qilu Hospital of Shandong University, Jinan, China.,Robot Engineering Laboratory for Precise Diagnosis and Therapy of GI Tumor, Qilu Hospital of Shandong University, Jinan, China
| | - Minjuan Lin
- Department of Gastroenterology, Qilu Hospital of Shandong University, Jinan, China.,Laboratory of Translational Gastroenterology, Qilu Hospital of Shandong University, Jinan, China.,Robot Engineering Laboratory for Precise Diagnosis and Therapy of GI Tumor, Qilu Hospital of Shandong University, Jinan, China
| | - Boshen Lin
- Department of Gastroenterology, Qilu Hospital of Shandong University, Jinan, China.,Laboratory of Translational Gastroenterology, Qilu Hospital of Shandong University, Jinan, China.,Robot Engineering Laboratory for Precise Diagnosis and Therapy of GI Tumor, Qilu Hospital of Shandong University, Jinan, China
| | - Qingzhou Kong
- Department of Gastroenterology, Qilu Hospital of Shandong University, Jinan, China.,Laboratory of Translational Gastroenterology, Qilu Hospital of Shandong University, Jinan, China.,Robot Engineering Laboratory for Precise Diagnosis and Therapy of GI Tumor, Qilu Hospital of Shandong University, Jinan, China
| | - Yuming Ding
- Department of Gastroenterology, Qilu Hospital of Shandong University, Jinan, China.,Laboratory of Translational Gastroenterology, Qilu Hospital of Shandong University, Jinan, China.,Robot Engineering Laboratory for Precise Diagnosis and Therapy of GI Tumor, Qilu Hospital of Shandong University, Jinan, China
| | - Xiaoyun Yang
- Department of Gastroenterology, Qilu Hospital of Shandong University, Jinan, China.,Laboratory of Translational Gastroenterology, Qilu Hospital of Shandong University, Jinan, China
| | - Xiuli Zuo
- Department of Gastroenterology, Qilu Hospital of Shandong University, Jinan, China.,Laboratory of Translational Gastroenterology, Qilu Hospital of Shandong University, Jinan, China.,Robot Engineering Laboratory for Precise Diagnosis and Therapy of GI Tumor, Qilu Hospital of Shandong University, Jinan, China
| | - Yanqing Li
- Department of Gastroenterology, Qilu Hospital of Shandong University, Jinan, China.,Laboratory of Translational Gastroenterology, Qilu Hospital of Shandong University, Jinan, China.,Robot Engineering Laboratory for Precise Diagnosis and Therapy of GI Tumor, Qilu Hospital of Shandong University, Jinan, China
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Solaimany Aminabad M, Hadi M, Mirbagheri SZ, Mesdaghinia A, Bakhtiari R, Alebouyeh M, Nazmara S. Effect of dilution factor on the isolation of Helicobacter pylori from municipal wastewater using culture technique. IRANIAN JOURNAL OF MICROBIOLOGY 2022; 14:891-900. [PMID: 36721448 PMCID: PMC9867627 DOI: 10.18502/ijm.v14i6.11264] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
Background and Objectives Isolating Helicobacter pylori (H. pylori) from wastewater and culturing it using a conventional method has always been a controversial issue because the bacterium converts into a coccoid form when exposed to an unfavourable environment like wastewater. To clarify the cultivability behaviour of the bacterium in fresh wastewater samples, the effect of municipal wastewater dilation on the cultivation of the bacterium using a conventional method was examined. Materials and Methods Several dilutions of wastewater samples were inoculated with fresh H. pylori suspension (with McFarland's dilution 0.5) to examine the dilution effect of wastewater on the bacterium isolation. Results The H. pylori growth was found to be possible for a dilution factor from 1/106 to 1/107 of raw wastewater. In higher dilution factors the growth of fungi was dominant and could prevent the isolation of the bacterium. Conclusion The optimized technique could be applied in future studies for increasing the chance of H. pylori isolation from fresh wastewater environments.
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Affiliation(s)
- Mehri Solaimany Aminabad
- Center for Water Quality Research (CWQR), Institute for Environmental Research (IER), Tehran University of Medical Sciences, Tehran, Iran
| | - Mahdi Hadi
- Center for Water Quality Research (CWQR), Institute for Environmental Research (IER), Tehran University of Medical Sciences, Tehran, Iran,Corresponding authors: Mahdi Hadi, Ph.D, Center for Water Quality Research (CWQR), Institute for Environmental Research (IER), Tehran University of Medical Sciences, Tehran, Iran. Tel: +98-2188988135 Fax: +98-2188978398
| | - Seyedeh Zohreh Mirbagheri
- Pediatric Infections Research Center, Research Institute for Children‘s Health, Shahid Beheshti University of Medical Sciences, Tehran, Iran
| | - Alireza Mesdaghinia
- Center for Water Quality Research (CWQR), Institute for Environmental Research (IER), Tehran University of Medical Sciences, Tehran, Iran,Alireza Mesdaghinia, Ph.D, Center for Water Quality Research (CWQR), Institute for Environmental Research (IER), Tehran University of Medical Sciences, Tehran, Iran. Tel: +98-2188978399 Fax: +98-2188978398
| | - Ronak Bakhtiari
- Department of Pathobiology, School of Public Health, Tehran University of Medical Sciences, Tehran, Iran
| | - Masoud Alebouyeh
- Pediatric Infections Research Center, Research Institute for Children‘s Health, Shahid Beheshti University of Medical Sciences, Tehran, Iran
| | - Shahrokh Nazmara
- Center for Water Quality Research (CWQR), Institute for Environmental Research (IER), Tehran University of Medical Sciences, Tehran, Iran
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Duarte N, Salazar V, Casanova G, Suárez P, Fernández-Delgado M. Occurrence of Helicobacter spp. and Fecal Bacterial Contamination in High-altitude Aquatic Environments from the Andes. BULLETIN OF ENVIRONMENTAL CONTAMINATION AND TOXICOLOGY 2021; 107:433-440. [PMID: 34347116 DOI: 10.1007/s00128-021-03347-9] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/13/2020] [Accepted: 07/20/2021] [Indexed: 06/13/2023]
Abstract
The occurrence of Helicobacter spp. and fecal bacterial contamination was investigated in high-altitude environments from the Northeastern Andes of Venezuela. Helicobacter DNA was detected by PCR in streams, drinking and irrigation waters, and one culture from drinking water by the HP enrichment medium for selection of Helicobacter pylori, which displayed 98.98% homology to this pathogen based on 16S rRNA gene sequencing. FISH demonstrated predominant coccoid cells of the target bacteria indicative of the viable but nonculturable (VBNC) state in all water samples and HP cultures. Our work reveals for the first time Helicobacter spp. in waters from one of the highest places in the world. These results, together with the presence of fecal coliforms (2-160 MPN/100 mL) from the headwaters of rivers to drinking and irrigation waters, alert fecal contamination and epidemiological implications in this area of ecological and economic importance for the region.
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Affiliation(s)
- Nereida Duarte
- Instituto Autónomo Hospital, Universitario de Los Andes, Mérida, Venezuela
| | - Víctor Salazar
- Centro de Biofísica y Bioquímica, Instituto Venezolano de Investigaciones Científicas (IVIC), Altos de Pipe, Miranda, Venezuela
| | - Gerardo Casanova
- Instituto Autónomo Hospital, Universitario de Los Andes, Mérida, Venezuela
| | - Paula Suárez
- Departamento de Biología de Organismos, Universidad Simón Bolívar (USB), Caracas, Venezuela
| | - Milagro Fernández-Delgado
- Centro de Biofísica y Bioquímica, Instituto Venezolano de Investigaciones Científicas (IVIC), Altos de Pipe, Miranda, Venezuela.
- Centro de Ingeniería de Materiales y Nanotecnología, IVIC, Altos de Pipe, Miranda, Venezuela.
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Efficacy of Loop-Mediated Isothermal Amplification for H. pylori Detection as Point-of-Care Testing by Noninvasive Sampling. Diagnostics (Basel) 2021; 11:diagnostics11091538. [PMID: 34573879 PMCID: PMC8467764 DOI: 10.3390/diagnostics11091538] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/13/2021] [Revised: 08/17/2021] [Accepted: 08/21/2021] [Indexed: 11/23/2022] Open
Abstract
For targeted eradication of Helicobacterpylori (H. pylori) to reduce gastric cancer burden, a convenient approach is definitely needed. The purpose of this study was to evaluate the LAMP assay for H. pylori detection using samples collected by noninvasive and self-sampling methods. The available LAMP assay for H. pylori detection was appraised and verified using reference and clinically isolated H. pylori strains. In addition, a clinical study was conducted to assess the LAMP assay on 51 patients, from whom saliva, oral brushing samples, feces, corpus, and antrum specimens were available. Clarithromycin resistance was also analysed through detection of A2143G mutation using the LAMP-RFLP method. The validation and verification analysis demonstrated that the LAMP assay had an acceptable result in terms of specificity, sensitivity, reproducibility, and accuracy for clinical settings. The LAMP assay showed a detection limit for H. pylori down to 0.25 fg/µL of genomic DNA. An acceptable consensus was observed using saliva samples (sensitivity 58.1%, specificity 84.2%, PPV 85.7%, NPV 55.2%, accuracy 68%) in comparison to biopsy sampling as the gold standard. The performance testing of different combinations of noninvasive sampling methods demonstrated that a combination of saliva and oral brushing could achieve a sensitivity of 74.2% and a specificity of 57.9%. A2143G mutation detection by LAMP-RFLP showed perfect consensus with Sanger sequencing results. It appears that the LAMP assay in combination with noninvasive and self-sampling as a point-of-care testing (POCT) approach has potential usefulness to detect H.pylori infection in clinic settings and screening programs.
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The Puzzle of Coccoid Forms of Helicobacter pylori: Beyond Basic Science. Antibiotics (Basel) 2020; 9:antibiotics9060293. [PMID: 32486473 PMCID: PMC7345126 DOI: 10.3390/antibiotics9060293] [Citation(s) in RCA: 18] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/20/2020] [Revised: 05/19/2020] [Accepted: 05/29/2020] [Indexed: 01/06/2023] Open
Abstract
Helicobacter pylori (H. pylori) may enter a non-replicative, non-culturable, low metabolically active state, the so-called coccoid form, to survive in extreme environmental conditions. Since coccoid forms are not susceptible to antibiotics, they could represent a cause of therapy failure even in the absence of antibiotic resistance, i.e., relapse within one year. Furthermore, coccoid forms may colonize and infect the gastric mucosa in animal models and induce specific antibodies in animals and humans. Their detection is hard, since they are not culturable. Techniques, such as electron microscopy, polymerase chain reaction, loop-mediated isothermal amplification, flow cytometry and metagenomics, are promising even if current evidence is limited. Among the options for the treatment, some strategies have been suggested, such as a very high proton pump inhibitor dose, high-dose dual therapy, N-acetycysteine, linolenic acid and vonoprazan. These clinical, diagnostic and therapeutic uncertainties will represent fascinating challenges in the future.
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Farhadkhani M, Nikaeen M, Hassanzadeh A, Nikmanesh B. Potential transmission sources of Helicobacter pylori infection: detection of H. pylori in various environmental samples. JOURNAL OF ENVIRONMENTAL HEALTH SCIENCE & ENGINEERING 2019; 17:129-134. [PMID: 31321040 PMCID: PMC6582085 DOI: 10.1007/s40201-018-00333-y] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/11/2018] [Accepted: 12/17/2018] [Indexed: 05/23/2023]
Abstract
PURPOSE Helicobacter pylori is one of the most common human infectious agents which may be transmitted via water. This study was designed to test H. pylori presence via molecular methods in various aquatic environments as well as sewage sludge (SS) to understand the role of these environments in the pathogen's transmission. METHODS specific primers for the 16S rRNA and ureA genes of H. pylori were used in a nested and semi-nested PCR, respectively. Detection sensitivity of H. pylori in environmental samples by semi-nested PCR was also compared with real-time PCR. Analysis of fecal coliforms (FC) as pollution indicator bacteria was also performed. RESULTS H. pylori 16S rRNA gene was detected in 36% (14/39) of wastewater samples and 8% (2/25) of water samples, while amplification of ureA gene yielded only two positive results. None of the SS samples were positive for H. pylori and real-time PCR could not identify H. pylori in any of the samples. The results showed no correlation between the presence of H. pylori and FC. CONCLUSIONS Our result revealed the widespread presence of H. pylori in wastewater samples which indicates wastewater may be a source for dissemination and transmission of H. pylori infection. Further research is needed to determine the risk of H. pylori in wastewater reuse for irrigation of crops.
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Affiliation(s)
- Marzieh Farhadkhani
- Student Research Committee, School of Health, Isfahan University of Medical Sciences, Isfahan, Iran
| | - Mahnaz Nikaeen
- Department of Environmental Health Engineering, School of Health, Isfahan University of Medical Sciences, Hezar Jerib Avenue, Isfahan, Iran
| | - Akbar Hassanzadeh
- Department of Statistics and Epidemiology, School of Health, Isfahan University of Medical Sciences, Hezar Jerib Avenue, Isfahan, Iran
| | - Bahram Nikmanesh
- Department of Laboratory Medical Sciences, School of Allied Medical Sciences, Tehran University of Medical Sciences, Tehran, Iran
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Towhid ST. Microbial Interaction as a Determinant of the Quality of Supply Drinking Water: A Conceptual Analysis. Front Public Health 2018; 6:184. [PMID: 29998093 PMCID: PMC6028747 DOI: 10.3389/fpubh.2018.00184] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/31/2018] [Accepted: 06/08/2018] [Indexed: 11/13/2022] Open
Abstract
This conceptual analysis elucidates the microbial interaction inside municipal distribution pipes, subsequent deterioration in the quality of the supply water, and its impacts on public health. Literature review involved a total of 21 original reports on microbiological events inside the water distribution system were studied, summarizing the current knowledge about the build-up of microbes in treated municipal water at various points of the distribution system. Next, original reports from the microbiological analysis of supply water from Bangladesh were collected to enlist the types of bacteria found growing actively. A schematic diagram of microbial interaction among the genera was constructed with respect to the physical, chemical, and microbiological quality of the supply water. Finally latest guidelines and expert opinions from public health authorities around the world are reviewed to keep up with using cutting-edge molecular technology to ensure safe and good quality drinking water for municipal supply.
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Affiliation(s)
- Syeda T Towhid
- Department of Microbiology, Jagannath University, Dhaka, Bangladesh
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Boehnke KF, Brewster RK, Sánchez BN, Valdivieso M, Bussalleu A, Guevara M, Saenz CG, Alva SO, Gil E, Xi C. An assessment of drinking water contamination with Helicobacter pylori in Lima, Peru. Helicobacter 2018; 23:e12462. [PMID: 29316052 DOI: 10.1111/hel.12462] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
BACKGROUND Helicobacter pylori is a gut bacterium that is the primary cause of gastric cancer. H. pylori infection has been consistently associated with lack of access to sanitation and clean drinking water. In this study, we conducted time-series sampling of drinking water in Lima, Peru, to examine trends of H. pylori contamination and other water characteristics. MATERIALS AND METHODS Drinking water samples were collected from a single faucet in Lima's Lince district 5 days per week from June 2015 to May 2016, and pH, temperature, free available chlorine, and conductivity were measured. Quantities of H. pylori in all water samples were measured using quantitative polymerase chain reaction. Relationships between the presence/absence and quantity of H. pylori and water characteristics in the 2015-2016 period were examined using regression methods accounting for the time-series design. RESULTS Forty-nine of 241 (20.3%) of drinking water samples were contaminated with H. pylori. Statistical analyses identified no associations between sampling date and the likelihood of contamination with H. pylori. Statistically significant relationships were found between lower temperatures and a lower likelihood of the presence of H. pylori (P < .05), as well as between higher pH and higher quantities of H. pylori (P < .05). CONCLUSIONS This study has provided evidence of the presence of H. pylori DNA in the drinking water of a single drinking water faucet in the Lince district of Lima. However, no seasonal trends were observed. Further studies are needed to determine the presence of H. pylori in other drinking water sources in other districts in Lima, as well as to determine the viability of H. pylori in these water sources. Such studies would potentially allow for better understanding and estimates of the risk of infection due to exposure to H. pylori in drinking water.
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Affiliation(s)
- Kevin F Boehnke
- Department of Environmental Health Sciences, School of Public Health, University of Michigan, Ann Arbor, MI, USA
| | - Rebecca K Brewster
- Department of Environmental Health Sciences, School of Public Health, University of Michigan, Ann Arbor, MI, USA
| | - Brisa N Sánchez
- Department of Biostatistics, School of Public Health, University of Michigan, Ann Arbor, MI, USA
| | - Manuel Valdivieso
- Division of Hematology Oncology, Department of Internal Medicine, University of Michigan, Ann Arbor, MI, USA
| | - Alejandro Bussalleu
- Departamento Académico de Clínicas Médicas, Universidad Peruana Cayetano Heredia, Lima, Perú
| | - Magaly Guevara
- Dirección General de Salud Ambiental e Inocuidad Alimentaria - DIGESA: Ministerio de Salud del Perú, Lima, Peru
| | - Claudia Gonzales Saenz
- Dirección General de Salud Ambiental e Inocuidad Alimentaria - DIGESA: Ministerio de Salud del Perú, Lima, Peru
| | - Soledad Osorio Alva
- Dirección General de Salud Ambiental e Inocuidad Alimentaria - DIGESA: Ministerio de Salud del Perú, Lima, Peru
| | - Elena Gil
- Dirección General de Salud Ambiental e Inocuidad Alimentaria - DIGESA: Ministerio de Salud del Perú, Lima, Peru
| | - Chuanwu Xi
- Department of Environmental Health Sciences, School of Public Health, University of Michigan, Ann Arbor, MI, USA
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12
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Begum YA, Rydberg HA, Thorell K, Kwak YK, Sun L, Joffré E, Qadri F, Sjöling Å. In Situ Analyses Directly in Diarrheal Stool Reveal Large Variations in Bacterial Load and Active Toxin Expression of Enterotoxigenic Escherichiacoli and Vibrio cholerae. mSphere 2018; 3:e00517-17. [PMID: 29404412 PMCID: PMC5784243 DOI: 10.1128/msphere.00517-17] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/02/2017] [Accepted: 12/27/2017] [Indexed: 11/20/2022] Open
Abstract
The bacterial pathogens enterotoxigenic Escherichia coli (ETEC) and Vibrio cholerae are major causes of diarrhea. ETEC causes diarrhea by production of the heat-labile toxin (LT) and heat-stable toxins (STh and STp), while V. cholerae produces cholera toxin (CT). In this study, we determined the occurrence and bacterial doses of the two pathogens and their respective toxin expression levels directly in liquid diarrheal stools of patients in Dhaka, Bangladesh. By quantitative culture and real-time quantitative PCR (qPCR) detection of the toxin genes, the two pathogens were found to coexist in several of the patients, at concentrations between 102 and 108 bacterial gene copies per ml. Even in culture-negative samples, gene copy numbers of 102 to 104 of either ETEC or V. cholerae toxin genes were detected by qPCR. RNA was extracted directly from stool, and gene expression levels, quantified by reverse transcriptase qPCR (RT-qPCR), of the genes encoding CT, LT, STh, and STp showed expression of toxin genes. Toxin enzyme-linked immunosorbent assay (ELISA) confirmed active toxin secretion directly in the liquid diarrhea. Analysis of ETEC isolates by multiplex PCR, dot blot analysis, and genome sequencing suggested that there are genetic ETEC profiles that are more commonly found as dominating single pathogens and others that are coinfectants with lower bacterial loads. The ETEC genomes, including assembled genomes of dominating ETEC isolates expressing LT/STh/CS5/CS6 and LT/CS7, are provided. In addition, this study highlights an emerging important ETEC strain expressing LT/STp and the novel colonization factor CS27b. These findings have implications for investigations of pathogenesis as well as for vaccine development. IMPORTANCE The cause of diarrheal disease is usually determined by screening for several microorganisms by various methods, and sole detection is used to assign the agent as the cause of disease. However, it has become increasingly clear that many infections are caused by coinfections with several pathogens and that the dose of the infecting pathogen is important. We quantified the absolute numbers of enterotoxigenic E. coli (ETEC) and Vibrio cholerae directly in diarrheal fluid. We noted several events where both pathogens were found but also a large dose dependency. In three samples, we found ETEC as the only pathogen sought for. These isolates belonged to globally distributed ETEC clones and were the dominating species in stool with active toxin expression. This suggests that certain superior virulent ETEC lineages are able to outcompete the gut microbiota and be the sole cause of disease and hence need to be specifically monitored.
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Affiliation(s)
- Yasmin Ara Begum
- International Centre for Diarrhoeal Disease Research, Bangladesh, Centre for Health and Population Research, Dhaka, Bangladesh
| | - Hanna A. Rydberg
- Department of Microbiology, Tumor and Cell Biology, Centre for Translational Microbiome Research (CTMR), Karolinska Institutet, Stockholm, Sweden
| | - Kaisa Thorell
- Department of Microbiology, Tumor and Cell Biology, Centre for Translational Microbiome Research (CTMR), Karolinska Institutet, Stockholm, Sweden
| | - Young-Keun Kwak
- Department of Microbiology, Tumor and Cell Biology, Centre for Translational Microbiome Research (CTMR), Karolinska Institutet, Stockholm, Sweden
| | - Lei Sun
- Department of Microbiology, Tumor and Cell Biology, Centre for Translational Microbiome Research (CTMR), Karolinska Institutet, Stockholm, Sweden
| | - Enrique Joffré
- Department of Microbiology, Tumor and Cell Biology, Centre for Translational Microbiome Research (CTMR), Karolinska Institutet, Stockholm, Sweden
| | - Firdausi Qadri
- International Centre for Diarrhoeal Disease Research, Bangladesh, Centre for Health and Population Research, Dhaka, Bangladesh
| | - Åsa Sjöling
- Department of Microbiology, Tumor and Cell Biology, Centre for Translational Microbiome Research (CTMR), Karolinska Institutet, Stockholm, Sweden
- Department of Microbiology and Immunology, Institute of Biomedicine, University of Gothenburg, Gothenburg, Sweden
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13
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Bilgilier C, Stadlmann A, Makristathis A, Thannesberger J, Kastner MT, Knoflach P, Steiner P, Schöniger-Hekele M, Högenauer C, Blesl A, Datz C, Huber-Schönauer U, Schöfl R, Wewalka F, Püspök A, Mitrovits N, Leiner J, Tilg H, Effenberger M, Moser M, Siebert F, Hinterberger I, Wurzer H, Stupnicki T, Watzinger N, Gombotz G, Hubmann R, Klimpel S, Biowski-Frotz S, Schrutka-Kölbl C, Graziadei I, Ludwiczek O, Kundi M, Hirschl AM, Steininger C. Prospective multicentre clinical study on inter- and intrapatient genetic variability for antimicrobial resistance of Helicobacter pylori. Clin Microbiol Infect 2017; 24:267-272. [PMID: 28669844 DOI: 10.1016/j.cmi.2017.06.025] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/15/2017] [Revised: 06/21/2017] [Accepted: 06/22/2017] [Indexed: 02/06/2023]
Abstract
OBJECTIVES We report on a large prospective, multicentre clinical investigation on inter- and intrapatient genetic variability for antimicrobial resistance of Helicobacter pylori. METHODS Therapy-naive patients (n = 2004) who had undergone routine diagnostic gastroscopy were prospectively included from all geographic regions of Austria. Gastric biopsy samples were collected separately from antrum and corpus. Samples were analysed by histopathology and real-time PCR for genotypic resistance to clarithromycin and quinolones. Clinical and demographic information was analysed in relation to resistance patterns. RESULTS H. pylori infection was detected in 514 (26%) of 2004 patients by histopathology and confirmed in 465 (90%) of 514 patients by real-time PCR. PCR results were discordant for antrum and corpus in 27 (5%) of 514 patients, indicating inhomogeneous infections. Clarithromycin resistance rates were 17% (77/448) and 19% (84/455), and quinolone resistance rates were 12% (37/310) and 10% (32/334) in antrum and corpus samples, respectively. Combination of test results per patient yielded resistance rates of 21% (98/465) and 13% (50/383) for clarithromycin and quinolones, respectively. Overall, infection with both sensitive and resistant H. pylori was detected in 65 (14%) of 465 patients. CONCLUSIONS Anatomically inhomogeneous infection with different, multiple H. pylori strains is common. Prospective clinical study design, collection of samples from multiple sites and microbiologic methods that allow the detection of coinfections are mandatory for collection of reliable data on antimicrobial resistance patterns in representative patient populations. (ClinicalTrials.gov identifier: NCT02925091).
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Affiliation(s)
- C Bilgilier
- Department of Internal Medicine I, Division of Infectious Diseases and Tropical Medicine, Austria
| | - A Stadlmann
- Department of Internal Medicine I, Division of Infectious Diseases and Tropical Medicine, Austria
| | - A Makristathis
- Department of Laboratory Medicine, Division of Clinical Microbiology, Austria
| | - J Thannesberger
- Department of Internal Medicine I, Division of Infectious Diseases and Tropical Medicine, Austria
| | - M-T Kastner
- Department of Internal Medicine I, Division of Infectious Diseases and Tropical Medicine, Austria
| | - P Knoflach
- Department of Internal Medicine I, Klinikum Wels-Grieskirchen, Wels, Austria
| | - P Steiner
- Department of Internal Medicine I, Klinikum Wels-Grieskirchen, Wels, Austria
| | - M Schöniger-Hekele
- Department of Medicine III, Division of Gastroenterology and Hepatology, Austria
| | - C Högenauer
- Department of Internal Medicine, Division of Gastroenterology and Hepatology, Medical University of Graz, Austria
| | - A Blesl
- Department of Internal Medicine, Division of Gastroenterology and Hepatology, Medical University of Graz, Austria
| | - C Datz
- Department of Internal Medicine, Hospital Oberndorf, Teaching Hospital of the Paracelsus Private Medical University Salzburg, Oberndorf bei Salzburg, Austria
| | - U Huber-Schönauer
- Department of Internal Medicine, Hospital Oberndorf, Teaching Hospital of the Paracelsus Private Medical University Salzburg, Oberndorf bei Salzburg, Austria
| | - R Schöfl
- Department of Internal Medicine IV, Division of Gastroenterology and Hepatology, Ordensklinikum Linz, Elisabethinen, Austria
| | - F Wewalka
- Department of Internal Medicine IV, Division of Gastroenterology and Hepatology, Ordensklinikum Linz, Elisabethinen, Austria
| | - A Püspök
- Department of Internal Medicine II, Hospital of the Brothers of Saint John of God Eisenstadt, Eisenstadt, Austria
| | - N Mitrovits
- Department of Internal Medicine II, Hospital of the Brothers of Saint John of God Eisenstadt, Eisenstadt, Austria
| | - J Leiner
- Department of Internal Medicine, Ladislaus Batthyány-Strattmann Hospital Kittsee, Kittsee, Austria
| | - H Tilg
- Department of Internal Medicine I, Medical University of Innsbruck, Innsbruck, Austria
| | - M Effenberger
- Department of Internal Medicine I, Medical University of Innsbruck, Innsbruck, Austria
| | - M Moser
- Ordination Dr Moser, Hall/Tyrol, Austria
| | - F Siebert
- Department of Internal Medicine, Hospital of the Brothers of Saint John of God St Veit/Glan, St Veit, Austria
| | - I Hinterberger
- Department of Internal Medicine, Hospital of the Brothers of Saint John of God St Veit/Glan, St Veit, Austria
| | - H Wurzer
- Department of Internal Medicine, LKH Graz South-West, Graz, Austria
| | - T Stupnicki
- Department of Internal Medicine, LKH Graz South-West, Graz, Austria
| | - N Watzinger
- Department of Internal Medicine, Hospital Group Feldbach-Fürstenfeld, Feldbach, Austria
| | - G Gombotz
- Department of Internal Medicine, Hospital Group Feldbach-Fürstenfeld, Feldbach, Austria
| | - R Hubmann
- Ordination Dr Rainer Hubmann, Linz, Austria
| | - S Klimpel
- Ordination Dr Siegfried Klimpel, Traun, Austria
| | | | | | - I Graziadei
- Department of Internal Medicine, Academic Teaching Hospital, Hall/Tyrol, Austria
| | - O Ludwiczek
- Department of Internal Medicine, Academic Teaching Hospital, Hall/Tyrol, Austria
| | - M Kundi
- Department of Environmental Health, Center for Public Health, Medical University of Vienna, Austria
| | - A M Hirschl
- Department of Laboratory Medicine, Division of Clinical Microbiology, Austria
| | - C Steininger
- Department of Internal Medicine I, Division of Infectious Diseases and Tropical Medicine, Austria.
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14
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Kindlund B, Sjöling Å, Yakkala C, Adamsson J, Janzon A, Hansson LE, Hermansson M, Janson P, Winqvist O, Lundin SB. CD4 + regulatory T cells in gastric cancer mucosa are proliferating and express high levels of IL-10 but little TGF-β. Gastric Cancer 2017; 20:116-125. [PMID: 26782287 DOI: 10.1007/s10120-015-0591-z] [Citation(s) in RCA: 60] [Impact Index Per Article: 8.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/29/2015] [Accepted: 12/21/2015] [Indexed: 02/07/2023]
Abstract
BACKGROUND An increase of regulatory T cells, defined as CD25high- and/or FOXP3+-expressing CD4+ T cells, within tumors has been reported in several studies. Tregs promote tumor growth by modulating the antitumor immune response, mainly through inhibition of T-cell-mediated tumor cell killing: this has been suggested to be dependent on IL-10 and/or TGF-β. In stomach cancer, the mechanisms behind the accumulation of Tregs in tumor tissue has not been fully elucidated, and neither has Treg gene expression in situ. MATERIALS AND METHODS Stomach tissue from gastric cancer patients undergoing gastric resection was analyzed using flow cytometry and cell sorting, followed by RT-PCR. RESULTS We observed that stomach CD4+ FOXP3+ T cells proliferated to a higher degree than CD4+ FOXP3- T cells, which may contribute to Treg accumulation in the mucosa. By analyzing DNA methylation, we demonstrated that both proliferating and nonproliferating FOXP3+ T cells exhibited complete demethylation of the FOXP3 gene, indicating a stable FOXP3 expression in both cell populations. Furthermore, analysis of T-cell populations isolated directly from the tumor and tumor-free mucosa demonstrated that CD4+ CD25high T cells have a higher IL-10/IFN-γ gene expression ratio but express lower levels of TGF-β than CD4+ CD25low/- T cells. CONCLUSION We demonstrate strong proliferation among regulatory CD4+ FOXP3+ CD25high T cells in the gastric cancer mucosa. These local Treg express a suppressive cytokine profile characterized by high IL-10 and low TGF-β and IFN-γ production.
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Affiliation(s)
- Bert Kindlund
- Department of Microbiology and Immunology, Institute of Biomedicine, University of Gothenburg, Box 435, 40530, Gothenburg, Sweden
| | - Åsa Sjöling
- Department of Microbiology and Immunology, Institute of Biomedicine, University of Gothenburg, Box 435, 40530, Gothenburg, Sweden
| | - Chakradhar Yakkala
- Department of Microbiology and Immunology, Institute of Biomedicine, University of Gothenburg, Box 435, 40530, Gothenburg, Sweden
| | - Jenni Adamsson
- Department of Microbiology and Immunology, Institute of Biomedicine, University of Gothenburg, Box 435, 40530, Gothenburg, Sweden
| | - Anders Janzon
- Department of Microbiology and Immunology, Institute of Biomedicine, University of Gothenburg, Box 435, 40530, Gothenburg, Sweden
| | - Lars-Erik Hansson
- Department of Gastro-Research, Sahlgrenska University Hospital, Gothenburg, Sweden
| | - Michael Hermansson
- Department of Gastro-Research, Sahlgrenska University Hospital, Gothenburg, Sweden
| | - Peter Janson
- Clinical Allergy Research Unit, Department of Medicine, Karolinska Institutet, Stockholm, Sweden
| | - Ola Winqvist
- Clinical Allergy Research Unit, Department of Medicine, Karolinska Institutet, Stockholm, Sweden
| | - Samuel B Lundin
- Department of Microbiology and Immunology, Institute of Biomedicine, University of Gothenburg, Box 435, 40530, Gothenburg, Sweden.
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15
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Ranjbar R, Khamesipour F, Jonaidi-Jafari N, Rahimi E. Helicobacter pylori isolated from Iranian drinking water: vacA, cagA, iceA, oipA and babA2 genotype status and antimicrobial resistance properties. FEBS Open Bio 2016; 6:433-41. [PMID: 27419049 PMCID: PMC4856422 DOI: 10.1002/2211-5463.12054] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/08/2016] [Revised: 03/09/2016] [Accepted: 03/10/2016] [Indexed: 02/05/2023] Open
Abstract
Despite the clinical importance of Helicobacter pylori in human gastric disorders, its exact route of transmission is still uncertain. Based on the contentious hypothesis and findings of previous investigations, water may play an important role in the transmission of H. pylori to humans. This study was carried out to investigate the vacA, cagA, oipA, iceA and babA2 genotype status and antimicrobial resistance properties of H. pylori strains isolated from the drinking water samples of four major provinces in Iran. A total of 400 drinking water samples were cultured and tested. H. pylori-positive strains were analyzed for the presence of various genotypes and antimicrobial resistance. Twelve of 400 (3%) water samples were positive for H. pylori. Samples from Isfahan province had the highest, while those from Shiraz had the lowest prevalence of H. pylori. The seasonal distribution was also determined, with the highest prevalence of bacteria in the summer season (7.36%). H. pylori strains harbored the highest levels of resistance against ampicillin (100%), erythromycin (75%), clarithromycin (75%), and trimethoprim (58.3%). The most commonly detected genotypes were vacAs1a (83.3%), vacAm1a (66.6%), vacAs2 (50%) and cagA (50%). The presence of similar genotypes in the H. pylori strains of drinking water and those of human clinical samples suggest that contaminated water maybe the sources of bacteria. Spiramycin and furazolidone are suggested for the treatment of cases of H. pylori infection.
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Affiliation(s)
- Reza Ranjbar
- Molecular Biology Research Center Baqiyatallah University of Medical Sciences Tehran Iran
| | - Faham Khamesipour
- Cellular and Molecular Research Center Sabzevar University of Medical Sciences Sabzevar Iran
| | | | - Ebrahim Rahimi
- Department of Food Hygiene Faculty of Veterinary Medicine Shahrekord Branch Islamic Azad University Shahrekord Iran
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16
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Thorell K, Hosseini S, Palacios Gonzáles RVP, Chaotham C, Graham DY, Paszat L, Rabeneck L, Lundin SB, Nookaew I, Sjöling Å. Identification of a Latin American-specific BabA adhesin variant through whole genome sequencing of Helicobacter pylori patient isolates from Nicaragua. BMC Evol Biol 2016; 16:53. [PMID: 26928576 PMCID: PMC4770546 DOI: 10.1186/s12862-016-0619-y] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/06/2015] [Accepted: 02/15/2016] [Indexed: 12/20/2022] Open
Abstract
Background Helicobacter pylori (H. pylori) is one of the most common bacterial infections in humans and this infection can lead to gastric ulcers and gastric cancer. H. pylori is one of the most genetically variable human pathogens and the ability of the bacterium to bind to the host epithelium as well as the presence of different virulence factors and genetic variants within these genes have been associated with disease severity. Nicaragua has particularly high gastric cancer incidence and we therefore studied Nicaraguan clinical H. pylori isolates for factors that could contribute to cancer risk. Methods The complete genomes of fifty-two Nicaraguan H. pylori isolates were sequenced and assembled de novo, and phylogenetic and virulence factor analyses were performed. Results The Nicaraguan isolates showed phylogenetic relationship with West African isolates in whole-genome sequence comparisons and with Western and urban South- and Central American isolates using MLSA (Multi-locus sequence analysis). A majority, 77 % of the isolates carried the cancer-associated virulence gene cagA and also the s1/i1/m1 vacuolating cytotoxin, vacA allele combination, which is linked to increased severity of disease. Specifically, we also found that Nicaraguan isolates have a blood group-binding adhesin (BabA) variant highly similar to previously reported BabA sequences from Latin America, including from isolates belonging to other phylogenetic groups. These BabA sequences were found to be under positive selection at several amino acid positions that differed from the global collection of isolates. Conclusion The discovery of a Latin American BabA variant, independent of overall phylogenetic background, suggests hitherto unknown host or environmental factors within the Latin American population giving H. pylori isolates carrying this adhesin variant a selective advantage, which could affect pathogenesis and risk for sequelae through specific adherence properties. Electronic supplementary material The online version of this article (doi:10.1186/s12862-016-0619-y) contains supplementary material, which is available to authorized users.
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Affiliation(s)
- Kaisa Thorell
- Department of Microbiology and Immunology, Sahlgrenska Academy, University of Gothenburg, Gothenburg, Sweden. .,Department of Biology and Biological Engineering, Chalmers University of Technology, Gothenburg, Sweden. .,Present address: Department of Microbiology, Tumor and Cell Biology, Karolinska Institutet, Box 280, 171 77, Stockholm, Sweden.
| | - Shaghayegh Hosseini
- Department of Biology and Biological Engineering, Chalmers University of Technology, Gothenburg, Sweden.
| | | | - Chatchai Chaotham
- Department of Microbiology and Immunology, Sahlgrenska Academy, University of Gothenburg, Gothenburg, Sweden.
| | - David Y Graham
- Department of Medicine, Michael E. DeBakey VA Medical Center and Baylor College of Medicine, Houston, TX, USA.
| | - Lawrence Paszat
- Dalla Lana School of Public Health, University of Toronto, Toronto, Canada.
| | - Linda Rabeneck
- Cancer Care Ontario, University of Toronto, Toronto, Canada.
| | - Samuel B Lundin
- Department of Microbiology and Immunology, Sahlgrenska Academy, University of Gothenburg, Gothenburg, Sweden.
| | - Intawat Nookaew
- Department of Biology and Biological Engineering, Chalmers University of Technology, Gothenburg, Sweden. .,Present address: Comparative Genomics Group, Biosciences Division, Oak Ridge National Laboratory, Oak Ridge, TN, USA.
| | - Åsa Sjöling
- Department of Microbiology and Immunology, Sahlgrenska Academy, University of Gothenburg, Gothenburg, Sweden. .,Present address: Department of Microbiology, Tumor and Cell Biology, Karolinska Institutet, Box 280, 171 77, Stockholm, Sweden.
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17
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Guilini C, Baehr C, Schaeffer E, Gizzi P, Rufi F, Haiech J, Weiss E, Bonnet D, Galzi JL. New Fluorescein Precursors for Live Bacteria Detection. Anal Chem 2015; 87:8858-66. [DOI: 10.1021/acs.analchem.5b02100] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Celia Guilini
- Biotechnologie
et Signalisation Cellulaire, UMR 7242 CNRS/Université de Strasbourg,
and Labex Medalis, ESBS, 300 Boulevard
Sébastien Brant, 67412 Illkirch, France
| | - Corinne Baehr
- Laboratoire d’Innovation
Thérapeutique, UMR 7200 CNRS/Université de Strasbourg,
and Labex Medalis, Faculté de Pharmacie, 74 Route du Rhin, 67401 Illkirch, France
| | - Etienne Schaeffer
- Biotechnologie
et Signalisation Cellulaire, UMR 7242 CNRS/Université de Strasbourg,
and Labex Medalis, ESBS, 300 Boulevard
Sébastien Brant, 67412 Illkirch, France
| | - Patrick Gizzi
- Biotechnologie
et Signalisation Cellulaire, UMR 7242 CNRS/Université de Strasbourg,
and Labex Medalis, ESBS, 300 Boulevard
Sébastien Brant, 67412 Illkirch, France
| | - Frédéric Rufi
- Bürkert Fluid Control Systems, BP21, 67220 Triembach-au-Val, France
| | - Jacques Haiech
- Laboratoire d’Innovation
Thérapeutique, UMR 7200 CNRS/Université de Strasbourg,
and Labex Medalis, Faculté de Pharmacie, 74 Route du Rhin, 67401 Illkirch, France
| | - Etienne Weiss
- Biotechnologie
et Signalisation Cellulaire, UMR 7242 CNRS/Université de Strasbourg,
and Labex Medalis, ESBS, 300 Boulevard
Sébastien Brant, 67412 Illkirch, France
| | - Dominique Bonnet
- Laboratoire d’Innovation
Thérapeutique, UMR 7200 CNRS/Université de Strasbourg,
and Labex Medalis, Faculté de Pharmacie, 74 Route du Rhin, 67401 Illkirch, France
| | - Jean-Luc Galzi
- Biotechnologie
et Signalisation Cellulaire, UMR 7242 CNRS/Université de Strasbourg,
and Labex Medalis, ESBS, 300 Boulevard
Sébastien Brant, 67412 Illkirch, France
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18
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Santiago P, Moreno Y, Ferrús MA. Identification of Viable Helicobacter pylori in Drinking Water Supplies by Cultural and Molecular Techniques. Helicobacter 2015; 20:252-9. [PMID: 25655472 DOI: 10.1111/hel.12205] [Citation(s) in RCA: 52] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
Abstract
BACKGROUND Helicobacter pylori is one of the most common causes of chronic bacterial infection in humans, directly related to peptic ulcer and gastric cancer. It has been suggested that H. pylori can be acquired through different transmission routes, including water. In this study, culture and qPCR were used to detect and identify the presence of H. pylori in drinking water. Furthermore, the combined techniques PMA-qPCR and DVC-FISH were applied for detection of viable cells of H. pylori. RESULTS Among 24 drinking water samples, 16 samples were positive for the presence of H. pylori, but viable cells were only detected in six samples. Characteristic colonies, covered by a mass of bacterial unspecific growth, were observed on selective agar plates from an only sample, after enrichment. The mixed culture was submitted to DVC-FISH and qPCR analysis, followed by sequencing of the amplicons. Molecular techniques confirmed the growth of H. pylori on the agar plate. CONCLUSIONS Our results demonstrate for the first time that H. pylori can survive and be potentially infective in drinking water, showing that water distribution systems could be a potential route for H. pylori transmission.
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Affiliation(s)
- Paula Santiago
- Biotechnology Department, Polytechnic University of Valencia, 46022, Valencia, Spain
| | - Yolanda Moreno
- Research Institute of Water and Environmental Ingeneering (IIAMA), Polytechnic University of Valencia, 46022, Valencia, Spain
| | - M Antonía Ferrús
- Biotechnology Department, Polytechnic University of Valencia, 46022, Valencia, Spain
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19
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Mazaheri Assadi M, Chamanrokh P, Whitehouse CA, Huq A. Methods for Detecting the Environmental Coccoid Form of Helicobacter pylori. Front Public Health 2015; 3:147. [PMID: 26075197 PMCID: PMC4446911 DOI: 10.3389/fpubh.2015.00147] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/18/2015] [Accepted: 05/08/2015] [Indexed: 12/29/2022] Open
Abstract
Helicobacter pylori is recognized as the most common pathogen to cause gastritis, peptic and duodenal ulcers, and gastric cancer. The organisms are found in two forms: (1) spiral-shaped bacillus and (2) coccoid. H. pylori coccoid form, generally found in the environment, is the transformed form of the normal spiral-shaped bacillus after exposed to water or adverse environmental conditions such as exposure to sub-inhibitory concentrations of antimicrobial agents. The putative infectious capability and the viability of H. pylori under environmental conditions are controversial. This disagreement is partially due to the fact of lack in detecting the coccoid form of H. pylori in the environment. Accurate and effective detection methods of H. pylori will lead to rapid treatment and disinfection, and less human health damages and reduction in health care costs. In this review, we provide a brief introduction to H. pylori environmental coccoid forms, their transmission, and detection methods. We further discuss the use of these detection methods including their accuracy and efficiency.
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Affiliation(s)
- Mahnaz Mazaheri Assadi
- Environmental Biotechnology Group, Biotechnology Department, Iranian Research Organization for Science and Technology , Tehran , Iran
| | - Parastoo Chamanrokh
- Maryland Pathogen Research Institute, University of Maryland , College Park, MD , USA
| | | | - Anwar Huq
- Maryland Pathogen Research Institute, University of Maryland , College Park, MD , USA
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Chamanrokh P, Shahhosseiny MH, Mazaheri Assadi M, Nejadsattari T, Esmaili D. Three Tests Used to Identify Non-Culturable Form of Helicobacter pylori in Water Samples. Jundishapur J Microbiol 2015; 8:e16811. [PMID: 26034541 PMCID: PMC4449853 DOI: 10.5812/jjm.8(4)2015.16811] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/24/2013] [Revised: 06/12/2014] [Accepted: 09/13/2014] [Indexed: 02/06/2023] Open
Abstract
Background: Helicobacter pylori, causing the most common chronic bacterial infection, exist in two forms; bacilli and coccoid. The coccoid form is identified as viable but non-culturable bacteria. Objectives: The current study aimed to conduct culture, polymerase chain reaction (PCR), and loop-mediated isothermal amplification (LAMP) tests to identify coccoid forms of H. pylori. Materials and Methods: The PCR and LAMP tests were optimized using specific primers for glmM gene. The sensitivity and specificity of the tests were determined. The current experimental study was conducted on 10 different strains isolated from clinical cases (H1-H10). The isolates were added to tap water and incubated at three different temperatures for one and two months intervals. After pure-culturing of the bacteria, DNAs were extracted and PCR and LAMP were performed. Results: Ten copies of targeted DNA were required for PCR detection whereas only five copies gave a positive reaction by LAMP assay, with 100% specificity. Of the 10 isolates inoculated in water for one and two months at three different temperatures 4, 22, and 37°C, only three cases (5%) were found positive in the first month; 13 (21.6%) and 29 cases (48.3%) were also positive by PCR and LAMP tests in the first and second months. Conclusions: Results of the current study confirmed that molecular methods such as PCR and LAMP were much more sensitive, rapid, and specific than culturing to identify non-culturable coccoid forms of H. pylori in water.
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Affiliation(s)
- Parastoo Chamanrokh
- Department of Biology, Science and Research Branch, Islamic Azad University, Tehran, IR Iran
- Corresponding author: Parastoo Chamanrokh, Department of Biology, Science and Research Branch, Islamic Azad University, Tehran, IR Iran. Tel: +98-9372727679, E-mail:
| | - Mohammad Hassan Shahhosseiny
- Department of Microbiology, Shahre Qods Branch, Islamic Azad University, Shahre Qods, IR Iran
- Iranian Gene Fanavar Institute (IGF), Tehran, IR Iran
| | - Mahnaz Mazaheri Assadi
- Department of Biotechnology, Iranian Research Organization for Science and Technology, Tehran, IR Iran
| | - Taher Nejadsattari
- Department of Biology, Science and Research Branch, Islamic Azad University, Tehran, IR Iran
| | - Davood Esmaili
- Department of Microbiology, Applied Microbiology Research Center, Baqiyatallah University of Medical Sciences, Tehran, IR Iran
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Holman CB, Bachoon DS, Otero E, Ramsubhag A. Detection of Helicobacter pylori in the coastal waters of Georgia, Puerto Rico and Trinidad. MARINE POLLUTION BULLETIN 2014; 79:354-8. [PMID: 24332757 DOI: 10.1016/j.marpolbul.2013.11.021] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/09/2013] [Revised: 11/15/2013] [Accepted: 11/19/2013] [Indexed: 05/02/2023]
Abstract
Fecal pollution in the coastal marine environments was assessed at eleven sampling locations along the Georgia coast and Trinidad, and nine sites from Puerto-Rico. Membrane filtration (EPA method 1604 and method 1600) was utilized for Escherichia coli and enterococci enumeration at each location. Quantitative polymerase chain reaction (qPCR) amplification of the 16S ribosomal RNA gene was used to determine the presence of the Helicobacter pylori in marine samples. There was no significant correlation between the levels of E. coli, enterococci and H. pylori in these water samples. H. pylori was detected at four of the 31 locations sampled; Oak Grove Island and Village Creek Landing in Georgia, Maracas river in Trinidad, and Ceiba Creek in Puerto Rico. The study confirms the potential public health risk to humans due to the widespread distribution of H. pylori in subtropical and tropical costal marine waters.
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Affiliation(s)
- Chelsea B Holman
- Department of Biological and Environmental Sciences, Georgia College and State University, Campus Box 81, Milledgeville, GA 31061-0490, USA
| | - D S Bachoon
- Department of Biological and Environmental Sciences, Georgia College and State University, Campus Box 81, Milledgeville, GA 31061-0490, USA.
| | - Ernesto Otero
- Department of Marine Sciences, University of Puerto Rico, Mayaguez Campus, P.O. Box 9000, Mayaguez 00681, Puerto Rico
| | - Adesh Ramsubhag
- Department of Life Sciences, The University of the West Indies, St. Augustine, Trinidad and Tobago
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Abstract
Over the preceding years and to date, the definitive mode of human infection by Helicobacter pylori has remained largely unknown and has thus gained the interest of researchers around the world. Numerous studies investigated possible sources of transmission of this emerging carcinogenic pathogen that colonizes >50% of humans, in many of which contaminated water is mentioned as a major cause. The infection rate is especially higher in developing countries, where contaminated water, combined with social hardships and poor sanitary conditions, plays a key role. Judging from the growing global population and the changing climate, the rate is expected to rise. Here, we sum up the current views of the water transmission hypothesis, and we discuss its implications.
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Affiliation(s)
- Ramy K Aziz
- Department of Microbiology and Immunology, Faculty of Pharmacy, Cairo University, Cairo, Egypt
| | | | - Radwa R Sharaf
- Department of Microbiology and Immunology, Faculty of Pharmacy, Cairo University, Cairo, Egypt ; Division of Molecular Medicine, Charité Medical School, Berlin, Germany
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Sintes E, Witte H, Stodderegger K, Steiner P, Herndl GJ. Temporal dynamics in the free-living bacterial community composition in the coastal North Sea. FEMS Microbiol Ecol 2012; 83:413-24. [PMID: 22938648 PMCID: PMC3561708 DOI: 10.1111/1574-6941.12003] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/18/2011] [Revised: 06/06/2012] [Accepted: 08/22/2012] [Indexed: 11/29/2022] Open
Abstract
The coastal North Sea is characterized by strong seasonal dynamics in abiotic and biotic variables. Hence, pronounced temporal changes in the bacterioplankton community composition can be expected. Catalyzed reporter deposition fluorescence in situ hybridization analysis showed a seasonal succession, with Alphaproteobacteria dominating before the spring phytoplankton bloom, Bacteroidetes increasing during the bloom (up to 60% of the prokaryotic community) and being replaced by Gammaproteobacteria during the postbloom period (on average 30% of prokaryotic cells). Daily changes in similarity of the bacterioplankton community assessed by Terminal Restriction Fragment Length Polymorphism averaged 0.08 day−1 (Whittaker similarity index) for the free-living bacterial community, resulting in a decreasing similarity between samples with increasing time up to approximately 150 days. After about 150 days, the community composition became increasingly similar to the initial composition. Changes in the bacterial community showed periods of fairly stable composition, interrupted by periods of rapid changes. Taken together, our results support the notion of a recurring bacterioplankton community in the coastal North Sea and indicate a tight coupling between the resources, the bacterial community metabolism, physiological structure and community composition throughout the seasonal cycle in the coastal North Sea.
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Affiliation(s)
- Eva Sintes
- Department of Biological Oceanography, Royal Netherlands Institute for Sea Research, Den Burg, The Netherlands.
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Zhang Y, Riley LK, Lin M, Hu Z. Determination of low-density Escherichia coli and Helicobacter pylori suspensions in water. WATER RESEARCH 2012; 46:2140-2148. [PMID: 22342315 DOI: 10.1016/j.watres.2012.01.030] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/14/2011] [Revised: 01/23/2012] [Accepted: 01/24/2012] [Indexed: 05/31/2023]
Abstract
Determination of low-density of bacteria, especially those of pathogenic strains in water, has proven difficult and challenging. Here, we developed and evaluated a lanthanum-based concentration method coupled with quantitative real-time PCR to concentrate and detect selected bacteria (Escherichia coli and Helicobacter pylori) in water. To improve qPCR efficiency, the flocs with enmeshed bacteria after chemical flocculation need to be dissolved before PCR detection. Ethylenediaminetetraacetic acid (EDTA) salt successfully dissolved the flocs from a lanthanum-based flocculation process, but not those from the traditional processes using chemicals such as FeCl(3) or Al(2)(SO(4))(3). Lanthanum-based concentration coupled with real-time PCR successfully determined E. coli at a concentration of 15 cells/mL in raw and finished water and H. pylori at a concentration of about 1 cell/mL in the finished water prior to disinfection. The H. pylori detection sensitivity could be easily increased to 60 cells/L by reducing the final volume of the DNA samples from 3 mL to 60 μL. With the elimination of membrane-clogging problem that is often encountered in direct membrane filtration, the lanthanum-based chemical flocculation coupled with qPCR is a promising method for determination of low-density of microbial suspensions in water.
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Affiliation(s)
- Yanyan Zhang
- Department of Civil and Environmental Engineering, University of Missouri, Columbia, MO 65211, USA
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Aw TG, Rose JB. Detection of pathogens in water: from phylochips to qPCR to pyrosequencing. Curr Opin Biotechnol 2011; 23:422-30. [PMID: 22153035 PMCID: PMC7126744 DOI: 10.1016/j.copbio.2011.11.016] [Citation(s) in RCA: 96] [Impact Index Per Article: 7.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/14/2011] [Revised: 10/30/2011] [Accepted: 11/11/2011] [Indexed: 12/24/2022]
Abstract
Waterborne pathogens pose a significant threat to human health and a proper assessment of microbial water quality is important for decision making regarding water infrastructure and treatment investments and eventually to provide early warning of disease, particularly given increasing global disasters associated with severe public health risks. Microbial water quality monitoring has undergone tremendous transition in recent years, with novel molecular tools beginning to offer rapid, high-throughput, sensitive and specific detection of a wide spectrum of microbial pathogens that challenge traditional culture-based techniques. High-density microarrays, quantitative real-time PCR (qPCR) and pyrosequencing which are considered to be breakthrough technologies borne out of the ‘molecular revolution’ are at present emerging rapidly as tools of pathogen detection and discovery. Future challenges lie in integrating these molecular tools with concentration techniques and bioinformatics platforms for unbiased guide of pathogen surveillance in water and developing standardized protocols.
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Affiliation(s)
- Tiong Gim Aw
- Department of Fisheries and Wildlife, 13 Natural Resources, Michigan State University, East Lansing, MI 48824, United States.
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Twing KI, Kirchman DL, Campbell BJ. Temporal study of Helicobacter pylori presence in coastal freshwater, estuary and marine waters. WATER RESEARCH 2011; 45:1897-905. [PMID: 21193216 DOI: 10.1016/j.watres.2010.12.013] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/29/2010] [Revised: 11/11/2010] [Accepted: 12/09/2010] [Indexed: 05/02/2023]
Abstract
Helicobacter pylori, a gastric pathogen, is believed to be transmitted via the fecal-oral route as well as the oral-oral route. Its presence and viability in environmental waters is not well characterized. The goals of this study were to test H. pylori presence via molecular methods in freshwater, estuarine and beach sites in Delaware over both short and long time scales and to establish whether fecal indicator bacteria, including total Enterococcus and human-specific Bacteroidetes species, are predictive of the pathogen in these waters. The presence of Helicobacter pylori was initially tested by PCR with newly designed 23S rRNA gene primers against Helicobacter spp. and confirmed by sequencing. Two coastal beach sites were repeatedly positive in 2007. Clone library analysis indicated the persistence of one operational taxonomic unit (OTU) over time at one site. Detection of H. pylori was also determined by PCR assays from DNA and RNA for the 16S rRNA gene, as well as DNA for the ureA and cagA genes. Approximately 21% of the samples were positive for H. pylori 16S rRNA gene and 80% of those were also positive for H. pylori 16S rRNA, indicating that this potential pathogen is not only present in natural waters, but also probably viable. There was no correlation between the occurrence of H. pylori and fecal indicator bacteria, suggesting that standard water quality tests are ineffective in predicting the presence of this pathogen in natural waters. These results demonstrate the widespread presence of potentially viable H. pylori in coastal marine and estuarine waters. Additionally, the repeatedly positive samples indicate either a continual contamination source or persistence of H. pylori in marine waters.
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Affiliation(s)
- Katrina I Twing
- School of Marine Science and Policy, University of Delaware, Lewes, DE 19958, USA
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Richards CL, Buchholz BJ, Ford TE, Broadaway SC, Pyle BH, Camper AK. Optimizing the growth of stressed Helicobacter pylori. J Microbiol Methods 2010; 84:174-82. [PMID: 21129415 DOI: 10.1016/j.mimet.2010.11.015] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/01/2010] [Revised: 11/15/2010] [Accepted: 11/15/2010] [Indexed: 02/08/2023]
Abstract
Helicobacter pylori is a gram-negative bacterium that colonizes the human stomach and is responsible for causing gastric ulcers. H. pylori is known to become stressed and nonculturable after exposure to unfavorable conditions. In this study, we enhanced previously published resuscitation procedures, characterized conditions under which stressed H. pylori can be recovered, and formulated a selective and differential resuscitation medium. Results showed that a specialized broth supplemented with trace minerals and lysed human erythrocytes and serum is required for the recovery of nonculturable H. pylori. The type of stress was an important factor in the efficacy of resuscitation, with cells exposed to atmospheric oxygen more readily resuscitated than nutrient deprived cells. After resuscitation, culturable cells were recovered from previously nonculturable oxygen stressed cells (24 and 72 h of exposure) and nonculturable nutrient deprived cells (24 h of exposure). The length of time the cells were exposed to the stress was also an important factor in the recovery of stressed H. pylori. RNA levels were quantified and transcription of the cell division related gene, cdrA (HP0066), was assessed by qRT-PCR. The low levels of RNA detected in stressed cells, after resuscitation, support the idea that a small population of viable cells may be responsible for the colonies recovered on solid agar. The modification of the resuscitation broth into a selective and differential slant culture medium also allowed the recovery of stressed H. pylori. The methods presented here highlight the benefits and limitations of using human blood products for recovering nonculturable H. pylori.
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Affiliation(s)
- Crystal L Richards
- Department of Microbiology and Center for Biofilm Engineering, Montana State University, Bozeman, MT 59717, USA
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Abstract
This article summarizes the published literature concerning the epidemiology and public health implications of Helicobacter pylori infection published from April 2009 through March 2010. Prevalence of infection varied between 7 and 87% and was lower in European studies. All retrieved studies examining transmission of infection concluded that spread is from person-to-person. One study collecting stool and vomitus samples from patients with acute gastroenteritis detected H. pylori DNA in 88% of vomitus and 74% of stool samples. Proposed risk factors for infection included male gender, increasing age, shorter height, tobacco use, lower socioeconomic status, obesity, and lower educational status of the parents in studies conducted among children. Decision analysis models suggest preventing acquisition of H. pylori, via vaccination in childhood, could be cost-effective and may reduce incidence of gastric cancer by over 40%. As yet, no country has adopted public health measures to treat infected individuals or prevent infection in populations at risk.
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Affiliation(s)
- Alexander C Ford
- Centre for Digestive Diseases, Leeds General Infirmary, Great George Street, Leeds, UK.
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Linke S, Lenz J, Gemein S, Exner M, Gebel J. Detection of Helicobacter pylori in biofilms by real-time PCR. Int J Hyg Environ Health 2010; 213:176-82. [PMID: 20427237 DOI: 10.1016/j.ijheh.2010.03.006] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/22/2009] [Revised: 03/23/2010] [Accepted: 03/25/2010] [Indexed: 12/18/2022]
Abstract
Helicobacter pylori is a cause of peptic ulcer disease and a causative agent of gastric cancer. Currently, a possible waterborne route of transmission or a possible survival in drinking water biofilms is discussed. H. pylori, like many other bacterial strains, has the ability to enter the viable but nonculturable state (vbnc) in case of unfavorable conditions. Therefore it is necessary to develop new analysis tools for vbnc bacteria. We established a fast and reliable method to detect H. pylori in drinking water biofilms by quantitative real-time PCR which makes it redundant to use difficult cultivation methods for nonculturable bacteria. With this method it was possible to identify water biofilms as a niche for H. pylori. The real-time PCR analysis targets the ureA subunit of the Helicobacter pylori urea gene which showed high specificity and sensitivity. The quantitative real-time PCR was used to detect H. pylori in biofilms of different age, unspiked and spiked with predetermined levels of cells. The drinking water biofilms were generated in a silicone-tube model. The DNA-sequences for probe and primers showed no cross-homologies to other related bacteria and it was possible to detect less than 10 genomic units of H. pylori. This novel method is a useful tool for a fast screening of drinking water biofilms for H. pylori. The results suggest that drinking water biofilms may act as a reservoir for H. pylori which raises new concerns about the role of biofilms as vectors for pathogens like Helicobacter pylori.
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Affiliation(s)
- S Linke
- Institute for Hygiene and Public Health, University of Bonn, Sigmund-Freud-Strasse 25, Klinikgelände 35, 53105 Bonn, Germany.
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Vale FF, Vítor JMB. Transmission pathway of Helicobacter pylori: does food play a role in rural and urban areas? Int J Food Microbiol 2010; 138:1-12. [PMID: 20122750 DOI: 10.1016/j.ijfoodmicro.2010.01.016] [Citation(s) in RCA: 87] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/18/2009] [Revised: 01/13/2010] [Accepted: 01/14/2010] [Indexed: 01/03/2023]
Abstract
Helicobacter pylori is a Gram-negative microaerophilic bacterium that has colonized the human gastric mucosa. This infection is very common and affects more than half of the human population. The prevalence is however unbalanced between rural developing areas (more than 80%) and urban developed areas (less than 40%). H. pylori is responsible for several pathologies, such as gastritis, peptic ulcer and gastric cancer but its transmission pathway is still not clear. The risk factors for H. pylori infection include poor social and economic development; poor hygienic practices; absence of hygienic drinking water; and unsanitary prepared food. There is evidence supporting a gastro-oral, oral-oral and faecal-oral transmission, but no predominant mechanism of transmission has been yet identified. Transmission may occur in a vertical mode (e.g. from parents to child) or in a horizontal mode (across individuals or from environmental contamination). In either case, the involvement of water and food cannot be excluded as vehicles or sources of infection. Indirect evidence of presence of H. pylori in water and food, namely the detection of its DNA and survival studies after artificial contamination of food and water has been described. This paper reviews data both favourable and against the role of water and food in the transmission of H. pylori, exploring their role as a potential transmission vehicle for person-to-person and food-chain transmission. The likelihood of the transmission pathway in developing rural and developed urban areas appears to be different. In developed areas, person-to-person transmission within families appears to be dominant, while in the rural developing areas the transmission pathway appears to be more complex. In this later case, the transmission by contaminated food, water, or via intensive contact between infants and non-parental caretakers may have a greater influence than within-family transmission.
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Affiliation(s)
- F F Vale
- Faculty of Engineering Catholic University of Portugal, Estrada Octávio Pato, Rio de Mouro, Portugal.
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Janzon A, Bhuiyan T, Lundgren A, Qadri F, Svennerholm AM, Sjöling A. Presence of high numbers of transcriptionally active Helicobacter pylori in vomitus from Bangladeshi patients suffering from acute gastroenteritis. Helicobacter 2009; 14:237-47. [PMID: 19674127 DOI: 10.1111/j.1523-5378.2009.00692.x] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
Abstract
BACKGROUND Helicobacter pylori is one of the most prevalent human bacterial pathogens; however, its transmission pathways remain unknown. New infections of H. pylori during outbreaks of gastroenteritis have been suggested previously, and to explore this transmission route further H. pylori was quantified in vomitus and diarrheal stool of patients suffering from acute gastroenteritis in Dhaka, Bangladesh. MATERIALS AND METHODS Vomitus and stool samples from 28 patients seeking care at the International Centre for Diarrhoeal Disease Research hospital were analyzed for presence of H. pylori and other pathogens using quantitative culturing, real-time polymerase chain reaction (PCR), and H. pylori stool antigen test. Bacterial gene expression was analyzed using reverse transcriptase real-time PCR. RESULTS The results of real-time PCR show that 23 (88%) of the 26 vomitus samples and 17 (74%) of the 23 stool samples were H. pylori positive, while stool antigen test show that 14 (67%) of the 21 stool samples were H. pylori positive. H. pylori could not be isolated by culture. Analysis using quantitative culture and real-time PCR to detect Vibrio cholerae showed strong correlation between these methods, and validating real-time PCR. Analysis of H. pylori virulence gene transcription in vomitus, diarrheal stool, antral and duodenal biopsy specimens, and in vitro cultures showed that cagA, flaA, and ureA were highly transcribed in vomitus, biopsy specimens, and cultures, whereas hpaA and vacA were expressed at lower levels. No H. pylori gene expression was detected in diarrheal stool. CONCLUSIONS We conclude that high numbers of transcriptionally active H. pylori are shed in vomitus, which indicates that new infections may be disseminated through vomiting.
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Affiliation(s)
- Anders Janzon
- Department of Microbiology and Immunology, Institute of Biomedicine, Sahlgrenska Academy at the University of Gothenburg, Gothenburg, Sweden.
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