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H pylori reinfection

Hiroaki Takeuchi, Mizuki Kira, Sayuri Konishi, Jumpei Uchiyama, Shigenobu Matsuzaki, Yoshihisa Matsumura
This study aimed to determine the characteristics of the Helicobacter pylori host NY43 strain and its prophage-cured derivative. H. pylori colonizing the human stomach cause many diseases. They show high genetic diversity, allowing the development of mutant strains that can form bacterial communities adapted to specific environmental conditions. Bacteriophage activities are associated with bacterial evolution, including pathogenicity development. Herein, we reported the complete genome sequence and genomic organization of two H...
May 8, 2018: Microbiology
Davide G Ribaldone, Dario Mazzucco, Sharmila Fagoonee, Lucia Crocellà, Alessandro Lavagna, Mario Fracchia, Gian P Caviglia, Daniele Simondi, Rodolfo Rocca, Marco Astegiano
Helicobacter pylori (H. pylori) is a Gram-negative bacterium, usually acquired during childhood, whose natural habitat is the gastric lumen. H. pylori is accepted as the most important cause of gastritis and peptic ulcer in humans. Nevertheless, its important role in the pathogenesis of gastric cancer as well as in several extra-gastroduodenal diseases has been confirmed. The aim of this work is to discuss, for the first time in a single article, all publications concerning H. pylori infection arising from Piedmont region, Italy, where in 1893 Giulio Bizzozero was the first who observed and described spiral organisms in the stomach of animal models...
February 19, 2018: Minerva Gastroenterologica e Dietologica
Y Hu, J-H Wan, X-Y Li, Y Zhu, D Y Graham, N-H Lu
BACKGROUND: Up-to-date information regarding the recurrence rate of Helicobacter pylori (H. pylori) after eradication therapy is not available. AIM: To evaluate the global recurrence rate following H. pylori eradication therapy and confirm its association with socioeconomic and sanitary conditions. METHODS: A systematic search of PubMed, EMBASE and the Cochrane library was performed to identify potentially relevant publications using the following keywords: "Helicobacter pylori" or "H...
November 2017: Alimentary Pharmacology & Therapeutics
Shinzo Hiroi, Kentaro Sugano, Shiro Tanaka, Koji Kawakami
OBJECTIVES: To explore the prevalence of Helicobacter pylori infection in Japan and the trends of its eradication therapy before and after the changes of the insurance coverage policy, first started in 2000, and expanded to cover H. pylori-positive gastritis in 2013. The impacts that the changes brought were estimated. METHODS: In this retrospective observational study and simulation study based on health insurance claims data, product sales data and relevant studies, individuals who received triple therapy (amoxicillin, clarithromycin, proton-pump inhibitors or potassium-competitive acid blockers) were defined as the first-time patients for H...
July 31, 2017: BMJ Open
Yi Hu, Yin Zhu, Nong-Hua Lu
Helicobacter pylori ( H. pylori ) is a common gastrointestinal bacterial strain closely associated with the incidence of chronic gastritis, peptic ulcers, gastric mucosa-associated lymphoid tissue lymphoma, and gastric cancer. A current research and clinical challenge is the increased rate of antibiotic resistance in H. pylori , which has led to a decreased H. pylori eradication rate. In this article, we review recent H. pylori infection and reinfection rates and H. pylori resistance to antibiotics, and we discuss the pertinent treatments...
2017: Frontiers in Cellular and Infection Microbiology
Juan E Corral, Robertino Mera, Corey W Dye, Douglas R Morgan
AIM: To estimate Helicobacter pylori (H. pylori) recurrence rate in Latin America, a region with a significant H. pylori prevalence and gastric cancer burden. METHODS: PubMed, LILACS, SciELO, Cochrane databases and abstracts from relevant meetings were reviewed. Information collected included: Participants' characteristics, recruitment strategy, diagnostic modality, treatment arms, follow-up and recurrence rates. Recurrence was calculated using 100-patients-year rates, and data were pooled using a random effects model...
April 15, 2017: World Journal of Gastrointestinal Oncology
Ratha Korn Vilaichone, Arti Wongcha Um, Peranart Chotivitayatarakorn
Background: H. pylori is an important cause of chronic gastritis, peptic ulcers and gastric cancer. Re-infection rates after successful eradication vary in different regions of the world but only limited studies have been performed in ASEAN Countries to clarify this important issue. The present study was designed to evaluate the H. pylori re-infection rate and predictors of re-infection in Thailand. Methods: We recruited patients with chronic gastritis after 1 and 2 years successful H. pylori eradication from Thammasat University Hospital, Pathumthani (Central urban area) and Maesod district, Tak (Northern rural area), Thailand...
March 1, 2017: Asian Pacific Journal of Cancer Prevention: APJCP
Björn Stenström, Helen M Windsor, Alma Fulurija, Mohammed Benghezal, M Priyanthi Kumarasinghe, Kazufumi Kimura, Chin Yen Tay, Charlie H Viiala, Hooi C Ee, Wei Lu, Tobias D Schoep, K Mary Webberley, Barry J Marshall
Repeated experimental reinfection of two subjects indicates that Helicobacter pylori infection does not promote an immune response protective against future reinfection. Our results highlight the importance of preventing reinfection after eradication, through public health initiatives, and possibly treatment of family members. They indicate difficulties for vaccine development, especially therapeutic vaccines.
November 2016: Clinical Case Reports
Mārcis Leja, Anthony Axon, Hermann Brenner
This review of recent publications related to the epidemiology of Helicobacter pylori highlights the origin of the infection, its changing prevalence, transmission, and outcome. A number of studies have addressed the ancestor roots of the bacteria, and the first genomewide analysis of bacterial strains suggests that its coexistence with humans is more ancient than previously thought. As opposed to the generally declining prevalence of H. pylori (including China and Japan), in Sweden, the prevalence of atrophic gastritis in the young population has risen...
September 2016: Helicobacter
Laimas Jonaitis, Gediminas Kiudelis, Paulius Slepavicius, Limas Kupcinskas
AIM: To evaluate the frequency of Helicobacter pylori (H. pylori) reinfection in peptic ulcer patients during 9 years after H. pylori eradication. METHODS: We invited 117 peptic ulcer patients in whom eradication of H. pylori was confirmed 1 year after eradication treatment both by histology and by rapid urease test. In total, 57 patients were available for the study procedures: 34 (59.6%) male, 23 (40.4%) female; mean age 52.3 ± 13.0 years. There were 45 (78.9%) patients with duodenal ulcer and 12 (21...
February 15, 2016: World Journal of Gastrointestinal Pathophysiology
Spencer Luiz Marques Payão, Lucas Trevizani Rasmussen
Helicobacter pylori (H. pylori) has long been found to cause gastric diseases such as gastritis, gastric ulcers and gastric cancer. The transmission medium of this bacterium has yet to be determined, though several studies have speculated that the oral cavity is a reservoir for H. pylori. Others have also reported that the oral cavity may be a source of both transmission and gastric reinfection; however, such results are controversial. We reviewed the literature and selected studies that report an association among H...
February 6, 2016: World Journal of Gastrointestinal Pharmacology and Therapeutics
Josette Raymond, Jean Michel Thiberge, Catherine Dauga
BACKGROUND AND AIMS: Infection due to Helicobacter pylori causes many gastrointestinal diseases including peptic ulcers and gastric carcinoma. Their treatment and prevention depends on the successful eradication of H. pylori. However, even after a well-conducted treatment, H. pylori persists in about 10-30% of patients. Recurrent infections can correspond to relapse or to re-infection and require appropriate medical care. In this study, we explore retrospectively three clinical cases using molecular methods, and propose new guidelines for the diagnosis of recurrence...
2016: Scandinavian Journal of Gastroenterology
Javier P Gisbert
This article summarizes the main conclusions of the studies presented at Digestive Disease Week this year (2015) related to Helicobacter pylori infection. Despite the undeniable widespread reduction in the prevalence of H. pylori infection, developing countries continue to have substantial infection rates. The prevalence of clarithromycin, metronidazole and quinolone resistance is markedly higher in most countries and continues to rise. Although H. pylori eradication reduces the incidence of gastric adenocarcinoma, it does not completely prevent its development; the presence of precancerous lesions--intestinal atrophy and metaplasia--is associated with a higher risk of developing this neoplasm, despite H...
September 2015: Gastroenterología y Hepatología
Yi-Ning Dai, Wei-Lai Yu, Hua-Tuo Zhu, Jie-Xia Ding, Chao-Hui Yu, You-Ming Li
AIM: To investigate whether Helicobacter pylori (H. pylori) infection is associated with glycemic control and whether hyperglycemia is modified by eradication therapy. METHODS: The databases of PubMed, Cochrane Library, Chinese BioMedicine Web Base and Chinese Science and Technology Journals were searched from inception to June 2014. Studies examining the association between H. pylori infection and glycemic control and/or the effect of eradication treatment on glycemic control in diabetic humans were eligible for inclusion...
May 7, 2015: World Journal of Gastroenterology: WJG
S Mendoza-Elizalde, A C Cortés-Márquez, S Giono-Cerezo, G Zuñiga, A Consuelo-Sánchez, P Valencia-Mayoral, J C Vigueras-Galindo, G Escalona-Venegas, J Arellano-Galindo, N Velázquez-Guadarrama
Genotypic differences in Helicobacter pylori play an important role in infection. We characterized the diversity of the cagA, cagE, babA2, and vacA genes in H. pylori strains isolated from pediatric patients and the relationship between these genes and clinical disease. Additionally, we employed the Neighbor-net algorithm to predict the behavior of the genotypes of the strains isolated from patients. Of 93 patients analyzed, 32 were positive for infection. A total of 160 H. pylori strains (five isolates per positive patient) were analyzed...
January 2015: Infection, Genetics and Evolution
Amin Talebi Bezmin Abadi, Ashraf Mohabati Mobarez, Omid Teymournejad, Mona Karbalaei
Frequently reported H. pylori antimicrobial therapy failures suggest that there might be a different niche where the bacteria can stay safe. Current study aims to examine potential role of oral colonization of H. pylori to feed reinfection after primary therapy. However, patients who were admitted to the gastroscopy section were chosen and gastric biopsy and dental plaque specimens were collected. Molecular and biochemical tests were applied to confirm H. pylori identity in different colonization niches. Results showed that 88...
2014: Journal of Pathogens
M G Bruce, D L Bruden, J M Morris, A L Reasonover, F Sacco, D Hurlburt, T W Hennessy, J Gove, A Parkinson, G Sahagun, P Davis, J Klejka, B J McMahon
We performed a study to determine rates of reinfection in three groups followed for 2 years after successful treatment: American Indian/Alaska Native (AI/AN) persons living in urban (group 1) and rural (group 2) communities, and urban Alaska non-Native persons (group 3). We enrolled adults diagnosed with H. pylori infection based on a positive urea breath test (13C-UBT). After successful treatment was documented at 2 months, we tested each patient by 13C-UBT at 4, 6, 12 and 24 months. At each visit, participants were asked about medication use, illnesses and risk factors for reinfection...
April 2015: Epidemiology and Infection
Kaiyu Yang, Yuqing Li, Xuedong Zhou
Helicobacter pylori (H. pylori) is one of the most common pathogens in human and it is closely related to gastrointestinal diseases. It is essential for us to understand the transmission process of H. pylori to prevent its spreading. The oral cavity has been proposed as a reservoir for gastric H. pylori, which has been detected by culture and polymerase chain reaction (PCR) in both dental plaque and saliva. Some researchers have proposed H. pylori in oral cavity may play an important role in its transmission and reinfection...
June 2014: Hua Xi Kou Qiang Yi Xue za Zhi, Huaxi Kouqiang Yixue Zazhi, West China Journal of Stomatology
Qizhi Cao, Xavier Didelot, Zhongbiao Wu, Zongwei Li, Lihua He, Yunsheng Li, Ming Ni, Yuanhai You, Xi Lin, Zhen Li, Yanan Gong, Minqiao Zheng, Minli Zhang, Jie Liu, Weijun Wang, Xiaochen Bo, Daniel Falush, Shengqi Wang, Jianzhong Zhang
OBJECTIVE: To study the detailed nature of genomic microevolution during mixed infection with multiple Helicobacter pylori strains in an individual. DESIGN: We sampled 18 isolates from a single biopsy from a patient with chronic gastritis and nephritis. Whole-genome sequencing was applied to these isolates, and statistical genetic tools were used to investigate their evolutionary history. RESULTS: The genomes fall into two clades, reflecting colonisation of the stomach by two distinct strains, and these lineages have accumulated diversity during an estimated 2...
April 2015: Gut
Arwa Al Sayed, Pradeep S Anand, Kavitha P Kamath, Shankargouda Patil, R S Preethanath, Sukumaran Anil
Background. Several studies were reported on the prevalence, and relationship between the existence of Helicobacter pylori (H. pylori) in oral cavity and in stomach of patients. The purpose of this study was to systematically review the existing literature on the presence of H. pylori in the oral cavity and its link to gastric infection, the existence of coinfection, and the impact of anti-H. pylori therapy on the dental plaque and vice versa. Method. Two authors independently searched the Medline, EMBASE, Cochrane Library, Web of Science, Google Scholar, and Scopus databases for relevant studies...
2014: ISRN Gastroenterology
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