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https://www.readbyqxmd.com/read/29165998/characterization-of-natural-organic-substances-potentially-hindering-rt-pcr-based-virus-detection-in-large-volumes-of-environmental-water
#1
Akihiko Hata, Manami Inaba, Hiroyuki Katayama, Hiroaki Furumai
Quantitative detection of pathogenic viruses in the environmental water is essential for the assessment of water safety. It is known that some of natural organic substances interfere with virus detection processes, i.e., nucleic acid extraction and reverse transcription-PCR. Such substances are carried over into a sample after virus concentration. In this study, inhibitory substances in coastal water samples were characterized in view of their effects on efficiency of virus detection and property as organic matters...
November 22, 2017: Environmental Science & Technology
https://www.readbyqxmd.com/read/29165124/changes-in-the-numbers-of-patients-with-acute-gastroenteritis-after-voluntary-introduction-of-the-rotavirus-vaccine-in-a-japanese-children-s-primary-emergency-medical-center
#2
Ichiro Morioka, Naohiro Kamiyoshi, Masahiro Nishiyama, Tomohiko Yamamura, Shogo Minamikawa, Sota Iwatani, Hiroaki Nagase, Kandai Nozu, Noriyuki Nishimura, Mariko Taniguchi-Ikeda, Kazuto Ishibashi, Akihito Ishida, Kazumoto Iijima
BACKGROUND: Acute gastroenteritis (AGE) is a major reason for presentation to pediatric primary emergency medical centers. Because rotavirus vaccines were introduced in November 2011 for voluntary vaccination in Japan, we analyzed the changes in the numbers of AGE patients. METHODS: The number and proportion of patients visiting Kobe children's primary emergency medical center from January 2011 to February 2015 due to AGE, out of all visiting children, were investigated retrospectively...
March 31, 2017: Environmental Health and Preventive Medicine
https://www.readbyqxmd.com/read/29161685/intergenotype-recombination-among-new-norovirus-gii-4-variants-in-the-complete-genome
#3
Jinfeng Xu, Tingjun Liu, Hua Wang, Hongxing Shen
GII.4 noroviruses (NoVs) are a major cause of acute gastroenteritis in humans. A new variant of GII.4, the Sydney variant, has recently become more prevalent on a global scale. Intragenotype recombinations are widespread within the pandemic NoV GII.4 lineage, and are likely to be important forces driving the evolution and emergence of novel GII.4 viruses. In this study, we sought to examine the role that intergenotype recombination has played in the emergence of GII.4 Sydney 2012 variants. The results show that the GII...
November 22, 2017: Intervirology
https://www.readbyqxmd.com/read/29157967/the-role-of-interferon-in-persistent-viral-infection-insights-from-murine-norovirus
#4
REVIEW
Timothy J Nice, Bridget A Robinson, Jacob A Van Winkle
Persistent viral infections result from evasion or avoidance of sterilizing immunity, extend the timeframe of virus transmission, and can trigger disease. Prior studies in mouse models of persistent infection have suggested that ineffective adaptive immune responses are necessary for persistent viral infection. However, recent work in the murine norovirus (MNV) model of persistent infection demonstrates that innate immunity can control both early and persistent viral replication independently of adaptive immune effector functions...
November 17, 2017: Trends in Microbiology
https://www.readbyqxmd.com/read/29156242/optimization-of-pmaxx-pretreatment-to-distinguish-between-human-norovirus-with-intact-and-altered-capsids-in-shellfish-and-sewage-samples
#5
Walter Randazzo, Mohammad Khezri, Joanna Ollivier, Françoise S Le Guyader, Jesús Rodríguez-Díaz, Rosa Aznar, Gloria Sánchez
Shellfish contamination by human noroviruses (HuNoVs) is a serious health and economic problem. Recently an ISO procedure based on RT-qPCR for the quantitative detection of HuNoVs in shellfish has been issued, but these procedures cannot discriminate between inactivated and potentially infectious viruses. The aim of the present study was to optimize a pretreatment using PMAxx to better discriminate between intact and heat-treated HuNoVs in shellfish and sewage. To this end, the optimal conditions (30min incubation with 100μM of PMAxx and 0...
November 15, 2017: International Journal of Food Microbiology
https://www.readbyqxmd.com/read/29154527/water-quality-survey-of-splash-pads-after-a-waterborne-salmonellosis-outbreak-tennessee-2014
#6
Joshua L Clayton, Judy Manners, Susan Miller, Craig Shepherd, John R Dunn, William Schaffner, Timothy F Jones
Waterborne outbreaks of salmonellosis are uncommon. The Tennessee Department of Health investigated a salmonellosis outbreak of 10 cases with the only common risk factor being exposure to a single splash pad. Risks included water splashed in the face at the splash pad and no free residual chlorine in the water system. We surveyed water quality and patron behaviors at splash pads statewide. Of the 29 splash pads participating in the water quality survey, 24 (83%) used a recirculating water system. Of the 24, 5 (21%) water samples were tested by polymerase chain reaction and found to be positive for E...
June 2017: Journal of Environmental Health
https://www.readbyqxmd.com/read/29150772/norovirus-gii-17-associated-with-a-foodborne-acute-gastroenteritis-outbreak-in-brazil-2016
#7
Juliana da Silva Ribeiro de Andrade, Tulio Machado Fumian, José Paulo Gagliardi Leite, Matheus Ribeiro de Assis, Alexandre Madi Fialho, Sergio Mouta, Cristiane Mendes Pereira Santiago, Marize Pereira Miagostovich
Foodborne transmission gastroenteritis (AGE) outbreak occurred during a celebration lunch in July, 2016, Brazil. All stool samples tested were positive for noroviruses (NoV) and phylogenetic analysis revealed that strains were genetically close to GII.17 Kawasaki_2014. These findings indicated circulation of NoV GII.17 Kawasaki_2014 in the Brazilian population, associated with AGE outbreak.
November 17, 2017: Food and Environmental Virology
https://www.readbyqxmd.com/read/29149672/the-application-of-bacteriophages-as-novel-indicators-of-viral-pathogens-in-wastewater-treatment-systems
#8
Edgard Dias, James Ebdon, Huw Taylor
Many wastewater treatment technologies have been shown to remove bacterial pathogens more effectively than viral pathogens and, in aquatic environments, levels of traditional faecal indicator bacteria (FIB) do not appear to correlate consistently with levels of human viral pathogens. There is, therefore, a need for novel viral indicators of faecal pollution and surrogates of viral pathogens, especially given the increasing importance of indirect and direct wastewater reuse. Potential candidates include bacteriophages (phages) and the study described here sought to elucidate the relationship between three groups of phages (somatic coliphages (SOMPH), F-RNA coliphages (F-RNAPH) and human-specific phages infecting B...
November 9, 2017: Water Research
https://www.readbyqxmd.com/read/29141131/simultaneous-detection-of-four-foodborne-viruses-in-food-samples-using-a-one-step-multiplex-reverse-transcription-pcr
#9
Shin-Young Lee, Mi-Ju Kim, Hyun-Joong Kim, KwangCheol Casey Jeong, Hae-Yeong Kim
A one-step multiplex reverse transcription PCR (RT-PCR) method comprising six primer sets (for the detection of norovirus GI and GII, hepatitis A virus, rotavirus, and astrovirus) was developed to simultaneously detect four kinds of pathogenic viruses. The size of the PCR products for norovirus GI and GII, hepatitis A virus (VP3/VP1 and P2A regions), rotavirus, and astrovirus were 330, 164, 244, 198, 629, and 449 bp, respectively. The RT-PCR with the six primer sets showed specificity for the pathogenic viruses...
November 15, 2017: Journal of Microbiology and Biotechnology
https://www.readbyqxmd.com/read/29140444/safety-and-immunogenicity-of-different-formulations-of-norovirus-vaccine-candidate-in-healthy-adults-a-randomized-controlled-double-blind-clinical-trial
#10
G Leroux-Roels, J P Cramer, P M Mendelman, J Sherwood, R Clemens, A Aerssens, I De Coster, A Borkowski, F Baehner, P Van Damme
Background: We investigated safety and immunogenicity of 1-2 doses of different bivalent virus-like particle (VLP) norovirus vaccine candidate (NoV) formulations in healthy 18-64-year-olds. Methods: On Days 1 and 28 participants (n=420) randomized to 14 equal groups received intramuscular control vaccine (hepatitis A) or one of 11 NoV formulations contained varying dosages of GI.1 and GII.4c genotype VLP antigens with Al(OH)3, and 0μg, 15μg or 50μg MPL. Immunogenicity was assessed on Days 1, 28, 56, 208 and 393...
November 13, 2017: Journal of Infectious Diseases
https://www.readbyqxmd.com/read/29137606/outbreak-of-caliciviruses-in-the-singapore-military-2015
#11
Freddy Jun Xian Neo, Jimmy Jin Phang Loh, Peijun Ting, Wei Xin Yeo, Christine Qiu Han Gao, Vernon Jian Ming Lee, Boon Huan Tan, Ching Ging Ng
BACKGROUND: From 31 August to 9 September 2015, a total of 150 military personnel at a military institution in Singapore were infected with acute gastroenteritis (AGE) with an attack rate of approximately 3%. This study aimed to determine the epidemiology of the outbreak, investigate its origins, and discuss measures to prevent future occurrences. METHODS: After the AGE outbreak was declared on 31 August 2015, symptom surveys, hygiene inspections, and the testing of water, food, and stool samples were initiated...
November 14, 2017: BMC Infectious Diseases
https://www.readbyqxmd.com/read/29135827/norovirus-and-rotavirus-disease-severity-in-children-systematic-review-and-meta-analysis
#12
Margarita Riera-Montes, Miguel O'Ryan, Thomas Verstraeten
BACKGROUND: Rotaviruses (RV) and Noroviruses (NoV) are the most common causes of severe acute gastroenteritis (AGE) in children. It is generally accepted that RV causes severe AGE in a higher proportion of cases compared with NoV. To our knowledge, there are no systematic reviews and meta-analyses comparing the severity of NoV and RV disease. METHODS: We searched MEDLINE for studies reporting data for NoV and RV medically-attended disease severity in children. We included studies where all children had been tested for both NoV (RT-PCR) and RV (ELISA or RT-PCR) and that reported disease severity using the Vesikari or modified Vesikari score, or provided clinical information on severity...
November 11, 2017: Pediatric Infectious Disease Journal
https://www.readbyqxmd.com/read/29128345/infectious-gastroenteritis-and-the-need-for-strict-contact-precaution-procedures-in-adults-presenting-in-the-emergency-department-a-danish-register-based-study
#13
Florence Skyum, Vibeke Andersen, Ming Chen, Court Pedersen, Christian Backer Mogensen
BACKGROUND: Acute infectious gastroenteritis requires contact precautions to prevent spreading. On acute admission the cause of diarrhoea is unknown, so the decision of whom to isolate has to be made on clinical information with a risk of inexpedient use of contact precautions. AIM: The aims of the study were to investigate how often gastroenteritis occurs, and thus the isolation indication has to be assessed, in Danish emergency departments, and how often patients have to remain on contact precaution according to the results of the faecal samples...
November 8, 2017: Journal of Hospital Infection
https://www.readbyqxmd.com/read/29126448/the-epidemiology-of-norovirus-in-the-middle-east-and-north-africa-mena-region-a-systematic-review
#14
REVIEW
Khalil Kreidieh, Rana Charide, Ghassan Dbaibo, Nada M Melhem
Norovirus (NoV) is considered the second leading cause of viral acute gastroenteritis (AGE). To our knowledge, there are no systematic reviews assessing the role of NoV in AGE in the Middle East and North Africa (MENA) region. Consequently, we conducted an extensive systematic literature review on articles studying NoV in the 24 countries of the MENA region during the past 15 years (2000-2015). The methods and reporting were set according to the 2015 PRISMA-P and based on the elements from the international prospective register of systematic reviews (PROSPERO)...
November 10, 2017: Virology Journal
https://www.readbyqxmd.com/read/29122738/performance-of-a-mobile-phone-app-based-participatory-syndromic-surveillance-system-for-acute-febrile-illness-and-acute-gastroenteritis-in-rural-guatemala
#15
Daniel Olson, Molly Lamb, Maria Renee Lopez, Kathryn Colborn, Alejandra Paniagua-Avila, Alma Zacarias, Ricardo Zambrano-Perilla, Sergio Ricardo Rodríguez-Castro, Celia Cordon-Rosales, Edwin Jose Asturias
BACKGROUND: With their increasing availability in resource-limited settings, mobile phones may provide an important tool for participatory syndromic surveillance, in which users provide symptom data directly into a centralized database. OBJECTIVE: We studied the performance of a mobile phone app-based participatory syndromic surveillance system for collecting syndromic data (acute febrile illness and acute gastroenteritis) to detect dengue virus and norovirus on a cohort of children living in a low-resource and rural area of Guatemala...
November 9, 2017: Journal of Medical Internet Research
https://www.readbyqxmd.com/read/29116002/ice-associated-norovirus-outbreak-predominantly-caused-by-gii-17-in-taiwan-2015
#16
Hao-Yuan Cheng, Min-Nan Hung, Wan-Chin Chen, Yi-Chun Lo, Ying-Shih Su, Hsin-Yi Wei, Meng-Yu Chen, Yen-Chang Tuan, Hui-Chen Lin, Hsu-Yang Lin, Tsung-Yen Liu, Yu-Ying Wang, Fang-Tzy Wu
BACKGROUND: On 5 March 2015, Taiwan Centers for Disease Control was notified of more than 200 students with gastroenteritis at a senior high school during excursion to Kenting. We conducted an outbreak investigation to identify the causative agent and possible vehicle of the pathogen. METHODS: We conducted a retrospective cohort study by using a structured questionnaire to interview all students for consumed food items during their stay at the resort. Students were defined as a gastroenteritis case while having vomiting or diarrhea after the breakfast on 4 March...
November 7, 2017: BMC Public Health
https://www.readbyqxmd.com/read/29109476/the-major-targets-of-acute-norovirus-infection-are-immune-cells-in-the-gut-associated-lymphoid-tissue
#17
Katrina R Grau, Alexa N Roth, Shu Zhu, Abel Hernandez, Natacha Colliou, Bayli B DiVita, Drake T Philip, Cara Riffe, Benoit Giasson, Shannon M Wallet, Mansour Mohamadzadeh, Stephanie M Karst
Noroviruses are the leading cause of food-borne gastroenteritis outbreaks and childhood diarrhoea globally, estimated to be responsible for 200,000 deaths in children each year (1-4) . Thus, reducing norovirus-associated disease is a critical priority. Development of vaccines and therapeutics has been hindered by the limited understanding of basic norovirus pathogenesis and cell tropism. While macrophages, dendritic cells, B cells and stem-cell-derived enteroids can all support infection of certain noroviruses in vitro (5-7) , efforts to define in vivo norovirus cell tropism have generated conflicting results...
November 6, 2017: Nature Microbiology
https://www.readbyqxmd.com/read/29107913/direct-potable-reuse-microbial-risk-assessment-methodology-sensitivity-analysis-and-application-to-state-log-credit-allocations
#18
Jeffrey A Soller, Sorina E Eftim, Sharon P Nappier
Understanding pathogen risks is a critically important consideration in the design of water treatment, particularly for potable reuse projects. As an extension to our published microbial risk assessment methodology to estimate infection risks associated with Direct Potable Reuse (DPR) treatment train unit process combinations, herein, we (1) provide an updated compilation of pathogen density data in raw wastewater and dose-response models; (2) conduct a series of sensitivity analyses to consider potential risk implications using updated data; (3) evaluate the risks associated with log credit allocations in the United States; and (4) identify reference pathogen reductions needed to consistently meet currently applied benchmark risk levels...
October 27, 2017: Water Research
https://www.readbyqxmd.com/read/29106738/an-experimental-miniature-piglet-model-for-the-infection-of-human-norovirus-gii
#19
Dong Joo Seo, Day Jung, Soontag Jung, Seung-Kwon Ha, Sang-Do Ha, In-Soo Choi, Jinjong Myoung, Changsun Choi
Ten Yucatan miniature piglets were challenged with the human norovirus (NoV) GII.12/GII.3 CAU140599 strain and five piglets were used as negative controls. Stool, serum, and organs were collected and processed from two NoV-infected piglets and one negative piglet at 1, 2, 3, 5, and 7 days post-inoculation (dpi). NoV was detected in stool and serum samples by real-time RT-PCR. Mild diarrhea was observed at 1-3 dpi. Fecal shedding and viremia were detected intermittently at 1, 3, and 7 dpi. While interferon-α was significantly elevated at 2-3 dpi, interferon-γ was not changed...
November 6, 2017: Journal of Medical Virology
https://www.readbyqxmd.com/read/29103266/high-frequency-of-enteric-protozoan-viral-and-bacterial-potential-pathogens-in-community-acquired-acute-diarrheal-episodes-evidence-based-on-results-of-luminex-gastrointestinal-pathogen-panel-assay
#20
Yousry A Hawash, Khadiga A Ismail, Mazen Almehmadi
Infectious diarrhea is endemic in most developing countries. We aimed to investigate the protozoan, viral, and bacterial causes of acute diarrhea in Taif, Saudi Arabia. A cross-sectional prospective 1-year study was conducted on 163 diarrheal patients of various ages. Stool samples were collected, 1 per patient, and tested for 3 protozoa, 3 viruses, and 9 bacteria with the Luminex Gastrointestinal Pathogen Panel. Overall, 53.4% (87/163) of samples were positives (20.8% protozoa, 19.6% viruses, 2.8% bacteria, and 9...
October 2017: Korean Journal of Parasitology
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