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https://www.readbyqxmd.com/read/28327111/temporal-distribution-of-gastroenteritis-viruses-in-ouagadougou-burkina-faso-seasonality-of-rotavirus
#1
Nafissatou Ouedraogo, Stephanie Moustapha Tomba Ngangas, Isidore Juste Ouindguèta Bonkoungou, Aissatou Bénéwendé Tiendrebeogo, Kuan Abdoulaye Traore, Idrissa Sanou, Alfred Sababénédjo Traore, Nicolas Barro
BACKGROUND: Acute gastroenteritis is one of the most common diseases among children and adults, and continues to cause a major problem of public health in Burkina Faso. The temporal pattern of rotavirus, norovirus, sapovirus, astrovirus, adenovirus and Aichivirus A was studied by examining prevalence of gastroenteritis viruses in association with meteorological variables in Ouagadougou, Burkina Faso. METHODS: Stool samples from 263 children under 5 years of age and 170 older children patients, adolescent and adults with gastroenteritis were collected in Ouagadougou, Burkina Faso from November 2011 to September 2012...
March 21, 2017: BMC Public Health
https://www.readbyqxmd.com/read/28325163/proton-pump-inhibitors-as-a-risk-factor-for-norovirus-infection
#2
C Prag, M Prag, H Fredlund
Norovirus causes viral gastroenteritis, which is a major problem in health care. The disease causes death in elderly and seriously ill patients, and results in significant health costs each year. Proton pump inhibitors (PPIs) reduce gastric acidity, which is an important protection against microorganisms. We hypothesised that treatment with PPIs increases the risk of contracting norovirus infection. This has not previously been studied. The study was a retrospective case-control study, in which 192 hospitalised patients positive for norovirus in Örebro County, Sweden, were identified as cases...
March 22, 2017: Epidemiology and Infection
https://www.readbyqxmd.com/read/28324709/improvement-of-virus-removal-using-ultrafiltration-membranes-modified-with-grafted-zwitterionic-polymer-hydrogels
#3
Ruiqing Lu, Chang Zhang, Maria Piatkovsky, Mathias Ulbricht, Moshe Herzberg, Thanh H Nguyen
Potable water reuse has been adopted by cities suffering water scarcity in recent years. The microbial safety in water reuse, especially with respect to pathogenic viruses, is still a concern for water consumers. Membrane filtration can achieve sufficient removal of pathogenic viruses without disinfection byproducts, but the required energy is intensive. In this study, we graft-polymerized zwitterionic SPP ([3-(methacryloylamino) propyl] dimethyl (3-sulfopropyl) ammonium hydroxide) on a 150 kDa ultrafiltration polyethersulfone membrane to achieve a significantly higher virus removal...
March 9, 2017: Water Research
https://www.readbyqxmd.com/read/28323855/etiology-of-acute-diarrhea-in-the-elderly-in-china-a-six-year-observational-study
#4
Zike Zhang, Shengjie Lai, Jianxing Yu, Qibin Geng, Wanqi Yang, Yu Chen, Jianguo Wu, Huaiqi Jing, Weizhong Yang, Zhongjie Li
Acute diarrhea leads to a substantial disease burden among the elderly worldwide. However, in the context of increasingly aging trend in China, the prevalence of etiological agents among elderly diarrheal patients was undetermined. This study aimed to explore the major enteropathogens of acute diarrhea among outpatients older than 65 years in China, and also the epidemiological features of the pathogens. Demographic and clinical data for acute diarrhea among outpatients older than 65 years were collected from 213 participating hospitals from 2009 to 2014...
2017: PloS One
https://www.readbyqxmd.com/read/28321885/molecular-analysis-of-norovirus-in-specimens-from-children-enrolled-in-a-1982-1986-study-in-bel%C3%A3-m-brazil-a-community-based-longitudinal-study
#5
Jones Anderson Monteiro Siqueira, Edivaldo Costa Sousa Júnior, Alexandre da Costa Linhares, Yvone Benchimol Gabbay
Fecal specimens were collected during a longitudinal, community-based study in the city of Belém, North Brazil, that was conducted over 3 years (October 1982 to March 1986), in which 20 children were included from birth to 3 years of age. A total of 229 fecal samples were screened by real time RT-PCR targeting the junction region (ORF 1/2) of the norovirus (NoV) genome. NoV-positive samples were subjected to PCR and sequencing of the viral polymerase (ORF1) and viral protein 1 (VP1) genes (ORF2). The junction region was also sequenced to assess for recombination when ORF1 and ORF2 genotyping results were dissimilar...
March 20, 2017: Journal of Medical Virology
https://www.readbyqxmd.com/read/28320526/assessment-and-risk-modeling-of-airborne-enteric-viruses-emitted-from-wastewater-reused-for-irrigation
#6
D Courault, I Albert, S Perelle, A Fraisse, P Renault, A Salemkour, P Amato
Reclamation of wastewater (WW) for irrigation, after treatment represents a challenge that could alleviate pressure on water resources and address the increasing demand for agriculture. However, the risks to human health must be assessed, particularly those related to human enteric viruses that resist standard treatments in most wastewater treatment plants (WWTP). The risks associated with exposure to viral bioaerosols near WWTP and near agricultural plots irrigated with WW are poorly documented. The objectives of this study were to 1) better characterize human enteric viruses found in bioaerosols near a "standard WWTP" and over fields irrigated with treated WW and 2) propose a numeric model to assess the health risk to populations located close to the irrigated areas, with particular attention to norovirus, which is responsible for most viral gastroenteritis in France...
March 17, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28319799/occurrence-of-hepatitis-a-and-e-and-norovirus-gi-and-gii-in-ready-to-eat-vegetables-in-italy
#7
V Terio, M Bottaro, E Pavoni, M N Losio, A Serraino, F Giacometti, V Martella, A Mottola, A Di Pinto, G Tantillo
Fresh vegetables and their ready-to-eat (RTE) salads have become increasingly recognized as potential vehicles for foodborne diseases. The EU Reg. 1441/2007 establishes microbiological criteria for bacterial pathogens for products placed on the market during their shelf-life (i.e. Salmonella spp., Listeria monocytogenes) for pre-cut fruits and vegetables (RTE) whilst it does not address the problem of contamination by enteric viruses. In this study we investigated the contamination by hepatitis A virus (HAV), hepatitis E virus (HEV) and norovirus (NoV) in 911 ready-to-eat vegetable samples taken from products at retail in Apulia and in Lombardia...
March 14, 2017: International Journal of Food Microbiology
https://www.readbyqxmd.com/read/28303593/sb-9200-a-novel-agonist-of-innate-immunity-shows-potent-antiviral-activity-against-resistant-hcv-variants
#8
Meleri Jones, Morven E Cunningham, Peter Wing, Sampath DeSilva, Rupa Challa, Anjaneyulu Sheri, Seetharamaiyer Padmanabhan, Radhakrishnan P Iyer, Brent E Korba, Nezam Afdhal, Graham R Foster
SB 9200 is a novel, first-in-class oral modulator of innate immunity that is believed to act via the activation of the RIG-I and NOD2 pathways. SB 9200 has broad-spectrum antiviral activity against RNA viruses including hepatitis C virus (HCV), norovirus, respiratory syncytial virus and influenza and has demonstrated activity against hepatitis B virus (HBV) in vitro and in vivo. In phase I clinical trials in chronically infected HCV patients, SB 9200 has been shown to reduce HCV RNA by up to 1.9 log10 . Here, we demonstrate the antiviral activity of SB 9200 against a HCV replicon system and patient derived virus...
March 17, 2017: Journal of Medical Virology
https://www.readbyqxmd.com/read/28302145/genomic-organization-and-recombination-analysis-of-a-porcine-sapovirus-identified-from-a-piglet-with-diarrhea-in-china
#9
Jingjiao Li, Quan Shen, Wen Zhang, Tingting Zhao, Yi Li, Jing Jiang, Xiangqian Yu, Zhibo Guo, Li Cui, Xiuguo Hua
BACKGROUND: Sapovirus (SaV), a member of the family Caliciviridae, is an etiologic agent of gastroenteritis in humans and pigs. To date, both intra- and inter-genogroup recombinant strains have been reported in many countries except for China. Here, we report an intra-genogroup recombination of porcine SaV identified from a piglet with diarrhea of China. METHODS: A fecal sample from a 15-day-old piglet with diarrhea was collected from Shanghai, China. Common agents of gastroenteritis including porcine circovirus type 2, porcine rotavirus, porcine transmissible gastroenteritis virus, porcine SaV, porcine norovirus, and porcine epidemic diarrhea virus were detected by RT-PCR or PCR method...
March 16, 2017: Virology Journal
https://www.readbyqxmd.com/read/28300648/detection-and-molecular-characterization-of-emergent-gii-p17-gii-17-norovirus-in-brazil-2015
#10
Juliana S R Andrade, Tulio M Fumian, José Paulo G Leite, Matheus R de Assis, Gonzalo Bello, Daiana Mir, Marize P Miagostovich
A newly GII.17 Kawazaki_2014 variant strain was detected recently in Brazil. Phylogenetic analysis reveals at least four independent introduction events of this lineage into this country that took place throughout 2014, coinciding with FIFA World Cup in Brazil, 2014, and Hong Kong has been identified as the most likely source of introduction. This variant emerged in Asia causing outbreaks and replacing prevalent GII.4. Emergence of GII.P17/GII.17 variant emphasizes the need for active laboratory surveillance for NoV including molecular epidemiology and studies on virus evolution...
March 11, 2017: Infection, Genetics and Evolution
https://www.readbyqxmd.com/read/28299601/the-presence-of-norovirus-and-adenovirus-on-environmental-surfaces-in-relation-to-the-hygienic-level-in-food-service-operations-associated-with-a-suspected-gastroenteritis-outbreak
#11
Leena Maunula, M Rönnqvist, R Åberg, J Lunden, M Nevas
Norovirus (NoV) gastroenteritis outbreaks appear frequently in food service operations (FSOs), such as in restaurants and canteens. In this study the presence of NoV and adenovirus (AdV) genomes was investigated on the surfaces of premises, especially in kitchens, of 30 FSOs where foodborne gastroenteritis outbreaks were suspected. The objective was to establish a possible association between the presence of virus genomes on surfaces and a visual hygienic status of the FSOs. NoV genome was found in 11 and AdV genome in 8 out of 30 FSOs...
March 15, 2017: Food and Environmental Virology
https://www.readbyqxmd.com/read/28299482/cloning-sequencing-and-characterization-of-the-genome-of-a-recombinant-norovirus-of-the-rare-genotype-gii-p7-gii-6-in-china
#12
Hui Cai, Yongxin Yu, Miao Jin, Yingjie Pan, Shuling Yan, Yongjie Wang
The genome sequence of a rare recombinant norovirus (NoV) genotype obtained from clinical samples in China was determined using one-step reverse transcription PCR. It was identified as the GII.P7/GII.6 genotype using both phylogenetic and SimPlot analyses. A high degree of variability was observed in the P2 subdomain, especially in the B-loop structure. The recombination breakpoints of all available GII.P7/GII.6 strains were mapped to two different positions within the RdRp region, both of which were at least 40 nt upstream of the overlap of ORF1 and 2...
March 15, 2017: Archives of Virology
https://www.readbyqxmd.com/read/28296972/the-transmissibility-of-noroviruses-statistical-modeling-of-outbreak-events-with-known-route-of-transmission-in-japan
#13
Ryota Matsuyama, Fuminari Miura, Hiroshi Nishiura
In Japan, the fraction of norovirus outbreaks attributable to human-to-human transmission has increased with time, and the timing of the increased fraction has coincided with the increase in the observed fraction of genogroup II genotype 4 (GII.4). The present study aimed to estimate the time-dependent changes in the transmissibility of noroviruses. The effective reproduction number (Ry), for year y, was estimated by analyzing the time series surveillance data for outbreak events from 2000 to 2016. Ry was estimated by using the fraction of outbreak events that were attributable to human-to-human transmission and by employing three different statistical models that are considered to mechanistically capture the possible data-generating process in different ways...
2017: PloS One
https://www.readbyqxmd.com/read/28294600/histo-blood-group-antigen-presentation-is-critical-for-norovirus-vlp-binding-to-glycosphingolipids-in-model-membranes
#14
Waqas Nasir, Martin Frank, Angelika Kunze, Marta Bally, Francisco Parra, Per-Georg Nyholm, Fredrik Höök, Göran Larson
Virus entry depends on biomolecular recognition at the surface of cell membranes. In case of glycolipid receptors, these events are expected to be influenced by how the glycan epitope close to the membrane is presented to the virus. This presentation of membrane associated glycans is more restricted as compared to glycans in solution, particularly because of orientational constraints imposed on the glycolipid through its lateral interactions with other membrane lipids and proteins. We have developed and employed total internal reflection fluorescence microscopy (TIRFM) based binding assay and a scheme for molecular dynamics (MD) membrane simulations to investigate the consequences of various glycan presentation effects...
March 15, 2017: ACS Chemical Biology
https://www.readbyqxmd.com/read/28294087/a-large-outbreak-of-acute-gastroenteritis-in-shippensburg-pennsylvania-1972-revisited-evidence-for-common-source-exposure-to-a-recombinant-gii-pg-gii-3-norovirus
#15
J A Johnson, G I Parra, E A Levenson, K Y Green
Historical outbreaks can be an important source of information in the understanding of norovirus evolution and epidemiology. Here, we revisit an outbreak of undiagnosed gastroenteritis that occurred in Shippensburg, Pennsylvania in 1972. Nearly 5000 people fell ill over the course of 10 days. Symptoms included diarrhea, vomiting, stomach cramps, and fever, lasting for a median of 24 h. Using current techniques, including next-generation sequencing of full-length viral genomic amplicons, we identified an unusual norovirus recombinant (GII...
March 15, 2017: Epidemiology and Infection
https://www.readbyqxmd.com/read/28288347/exploration-of-the-metal-coordination-region-of-concanavalin-a-for-its-interaction-with-human-norovirus
#16
Duwoon Kim, Hee-Min Lee, Kyung-Seo Oh, Ah Young Ki, Rachael A Protzman, Dongkyun Kim, Jong-Soon Choi, Min Ji Kim, Sung Hyun Kim, Bipin Vaidya, Seung Jae Lee, Joseph Kwon
Rapid methods for the detection and clinical treatment of human norovirus (HuNoV) are needed to control foodborne disease outbreaks, but reliable techniques that are fast and sensitive enough to detect small amounts of HuNoV in food and aquatic environments are not yet available. We explore the interactions between HuNoV and concanavalin A (Con A), which could facilitate the development of a sensitive detection tool for HuNoV. Biophysical studies including hydrogen/deuterium exchange (HDX) mass spectrometry and surface plasmon resonance (SPR) revealed that when the metal coordinated region of Con A, which spans Asp16 to His24, is converted to nine alanine residues (mCon A(MCR)), the affinity for HuNoV (GII...
March 6, 2017: Biomaterials
https://www.readbyqxmd.com/read/28287539/swab-sampling-method-for-the-detection-of-human-norovirus-on-surfaces
#17
Geun Woo Park, Preeti Chhabra, Jan Vinjé
Human noroviruses are a leading cause of epidemic and sporadic gastroenteritis worldwide. Because most infections are either spread directly via the person-to-person route or indirectly through environmental surfaces or food, contaminated fomites and inanimate surfaces are important vehicles for the spread of the virus during norovirus outbreaks. We developed and evaluated a protocol using macrofoam swabs for the detection and typing of human noroviruses from hard surfaces. Compared with fiber-tipped swabs or antistatic wipes, macrofoam swabs allow virus recovery (range 1...
February 6, 2017: Journal of Visualized Experiments: JoVE
https://www.readbyqxmd.com/read/28284453/infection-of-exposed-patients-during-norovirus-outbreaks-are-there-predictive-parameters
#18
S Kampmeier, M H Pillukat, A Kossow, A Pettke, A Mellmann
BACKGROUND: Norovirus outbreak management comprises isolation and cohorting of patients. In this context, exposed patients are preferably cohorted separately from symptomatic and unexposed asymptomatic patients, since they potentially develop symptoms of norovirus gastroenteritis. Whether routinely examined clinical or laboratory parameters can help to predict occurrence of gastroenteritis symptoms in those patients has not yet been examined. AIM: To evaluate routinely examined clinical and laboratory parameters as predictive values for the development of norovirus symptoms in exposed patients during outbreaks...
February 20, 2017: Journal of Hospital Infection
https://www.readbyqxmd.com/read/28277295/-acute-gastroenteritis-and-enteric-viruses-impact-on-the-detection-of-norovirus
#19
Oihana Martínez Azcona, Lorena Vázquez Gómez, Paula Buyo Sánchez, Raquel Díaz Soto, Luz María Moldes Suárez
INTRODUCTION: Norovirus is the second cause of acute viral gastroenteritis in infants after rotavirus. However, its prevalence is underestimated because a specific diagnosis is not usually performed. The comparative study of microbiological diagnostics, performed before and after the implementation date of a test for detecting a particular microorganism, allows the estimation of the percentage of cases not properly diagnosed earlier (for non-implementation of the test) and those that would be left to diagnose if the test is removed...
October 27, 2016: Anales de Pediatría: Publicación Oficial de la Asociación Española de Pediatría (A.E.P.)
https://www.readbyqxmd.com/read/28275078/slow-clearance-of-norovirus-following-infection-with-emerging-variants-of-genotype-gii-4-strains
#20
Lars Gustavsson, Rickard Nordén, Johan Westin, Magnus Lindh, Lars-Magnus Andersson
The emergence of new norovirus genotype GII.4 strains is associated with widespread norovirus epidemics. Extended periods of viral shedding can contribute to the epidemic potential of norovirus. In order to describe the duration of viral shedding in infections with novel emerging GII.4 strains vs. infections with previously circulating strains, we performed a prospective cohort study of patients hospitalized with norovirus gastroenteritis during separate winter seasons. Rectal swab samples were obtained at inclusion and weekly during follow-up...
March 8, 2017: Journal of Clinical Microbiology
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