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H pylori reinfection

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https://www.readbyqxmd.com/read/27830066/helicobacter-pylori-overcomes-natural-immunity-in-repeated-infections
#1
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
https://www.readbyqxmd.com/read/27531531/epidemiology-of-helicobacter-pylori-infection
#2
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
https://www.readbyqxmd.com/read/26909241/high-rate-of-helicobacter-pylori-reinfection-in-lithuanian-peptic-ulcer-patients
#3
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
https://www.readbyqxmd.com/read/26855818/helicobacter-pylori-and-its-reservoirs-a-correlation-with-the-gastric-infection
#4
REVIEW
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
https://www.readbyqxmd.com/read/26784882/diagnosis-of-helicobacter-pylori-recurrence-relapse-or-reinfection-usefulness-of-molecular-tools
#5
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
https://www.readbyqxmd.com/read/26520195/-helicobacter-pylori-associated-diseases
#6
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
https://www.readbyqxmd.com/read/25954115/is-helicobacter-pylori-infection-associated-with-glycemic-control-in-diabetics
#7
REVIEW
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
https://www.readbyqxmd.com/read/25445660/analysis-of-the-genotypic-diversity-of-strains-of-helicobacter-pylori-isolated-from-pediatric-patients-in-mexico
#8
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
https://www.readbyqxmd.com/read/25120932/concomitant-colonization-of-helicobacter-pylori-in-dental-plaque-and-gastric-biopsy
#9
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
https://www.readbyqxmd.com/read/25068917/reinfection-after-successful-eradication-of-helicobacter-pylori-in-three-different-populations-in-alaska
#10
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
https://www.readbyqxmd.com/read/25033655/-overview-of-researches-for-helicobacter-pylori-in-oral-cavity-and-stomach
#11
REVIEW
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
https://www.readbyqxmd.com/read/25007814/progressive-genomic-convergence-of-two-helicobacter-pylori-strains-during-mixed-infection-of-a-patient-with-chronic-gastritis
#12
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
https://www.readbyqxmd.com/read/24701355/oral-cavity-as-an-extragastric-reservoir-of-helicobacter-pylori
#13
REVIEW
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
https://www.readbyqxmd.com/read/24612156/helicobacter-pylori-recurrence-after-first-and-second-line-eradication-therapy-in-korea-the-problem-of-recrudescence-or-reinfection
#14
Seung Young Kim, Jong Jin Hyun, Sung Woo Jung, Ja Seol Koo, Hyung Joon Yim, Sang Woo Lee
BACKGROUND: Recurrence of Helicobacter pylori (H. pylori) infection is the result of either recrudescence or reinfection. Annual recurrence rates per patient-year of follow-up have been reported to vary across countries. The aim of this study was to analyze recurrence rates of H. pylori after first-line and second-line eradication therapies in Korea. MATERIALS AND METHODS: From 2007 to 2010, 2691 patients with H. pylori infection received first-line therapy and 573 patients who failed to respond to first-line therapy received second-line therapy...
June 2014: Helicobacter
https://www.readbyqxmd.com/read/24587649/diabetes-and-gastric-cancer-the-potential-links
#15
REVIEW
Chin-Hsiao Tseng, Farn-Hsuan Tseng
This article reviews the epidemiological evidence linking diabetes and gastric cancer and discusses some of the potential mechanisms, confounders and biases in the evaluation of such an association. Findings from four meta-analyses published from 2011 to 2013 suggest a positive link, which may be more remarkable in females and in the Asian populations. Putative mechanisms may involve shared risk factors, hyperglycemia, Helicobacter pylori (H. pylori) infection, high salt intake, medications and comorbidities...
February 21, 2014: World Journal of Gastroenterology: WJG
https://www.readbyqxmd.com/read/24050512/long-term-follow-up-helicobacter-pylori-reinfection-rate-after-second-line-treatment-bismuth-containing-quadruple-therapy-versus-moxifloxacin-based-triple-therapy
#16
RANDOMIZED CONTROLLED TRIAL
Min Soo Kim, Nayoung Kim, Sung Eun Kim, Hyun Jin Jo, Cheol Min Shin, Young Soo Park, Dong Ho Lee
BACKGROUND: The increasing trend of antibiotic resistance requires effective second-line Helicobacter pylori (H. pylori) treatment in high prevalence area of H. pylori. The aim of our study was to evaluate the reinfection rate of H. pylori after second-line treatment that would determine the long-term follow up effect of the rescue therapy. METHODS: A total of 648 patients who had failed previous H. pylori eradication on standard triple therapy were randomized into two regimens: 1, esomeprazole (20 mg b...
2013: BMC Gastroenterology
https://www.readbyqxmd.com/read/24011246/helicobacter-pylori-in-pediatrics
#17
REVIEW
Teresa Alarcón, María José Martínez-Gómez, Pedro Urruzuno
This review concerned the important pediatric studies published between April 2012 and March 2013. Symptomatology in Helicobacter pylori-positive children is nonspecific, except for those suffering from peptic ulcer diseases. Investigation of H. pylori status in children and adolescents with sideropenic anemia is recommended, and it is the aim of several studies worldwide. Associations of H. pylori with plasma ghrelin levels as well as the negative association of H. pylori with atopic disease were interesting objectives for several studies this year...
September 2013: Helicobacter
https://www.readbyqxmd.com/read/24011238/diagnosis-and-epidemiology-of-helicobacter-pylori-infection
#18
REVIEW
Xavier Calvet, María-José Ramírez Lázaro, Philippe Lehours, Francis Mégraud
A limited amount of new information was published in the field of diagnosis and epidemiology of Helicobacter pylori this last year. Besides some improvement in current tests, it is interesting to note the attempts to identify severe disease, for example gastric cancer, by breath analysis using nanomaterial-based sensors. In contrast, the predictive value for gastric cancer and atrophy of pepsinogen determinations was found inadequate. Prevalence studies of H. pylori infection have been carried out in adults and children around the world in the general population but also in specific communities...
September 2013: Helicobacter
https://www.readbyqxmd.com/read/23918779/contribution-of-secretory-antibodies-to-intestinal-mucosal-immunity-against-helicobacter-pylori
#19
Rebecca J Gorrell, Odilia L C Wijburg, John S Pedersen, Anna K Walduck, Terry Kwok, Richard A Strugnell, Roy M Robins-Browne
The natural immune response to Helicobacter pylori neither clears infection nor prevents reinfection. However, the ability of secretory antibodies to influence the course of H. pylori infection has not been determined. We compared the natural progression of H. pylori infection in wild-type C57BL/6 mice with that in mice lacking the polymeric immunoglobulin receptor (pIgR) that is essential for the secretion of polymeric antibody across mucosal surfaces. H. pylori SS1-infected wild-type and pIgR knockout (KO) mice were sampled longitudinally for gastrointestinal bacterial load, antibody response, and histological changes...
October 2013: Infection and Immunity
https://www.readbyqxmd.com/read/23567104/prevalence-of-helicobacter-pylori-and-its-recurrence-after-successful-eradication-in-a-developing-nation-morocco
#20
Dafr Allah Benajah, Mounia Lahbabi, Samia Alaoui, Karima El Rhazi, Mohammed El Abkari, Chakib Nejjari, Afaf Amarti, Bahia Bennani, Mustapha Mahmoud, Sidi Adil Ibrahimi
INTRODUCTION: In developed countries, reinfection after successful eradication of Helicobacter pylori appears unusual. High prevalences of H. pylori in developing countries may result in high reinfection rates. In Morocco, published studies regarding the prevalence of H. pylori are limited, and to our knowledge, there are no data regarding the reinfection rate of H. pylori after successful treatment. AIM: The aim of this study was to determine the prevalence of H...
November 2013: Clinics and Research in Hepatology and Gastroenterology
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