Nyt fra tidsskrifterne
Søgeord (norovirus) valgt.
13 emner vises.
Journal of Infectious Diseases, 16.08.2024
Tilføjet 16.08.2024
Abstract Background Chronic norovirus infection (CNI) causes significant morbidity in immunocompromised patients. No effective prevention or treatment currently exists.Methods Two patients with inborn errors of immunity, X- linked severe combined immunodeficiency (X-SCID) and DOCK8 deficiency, were followed longitudinally for clinical course, immune reconstitution, norovirus-specific T cell (NST) response, B cell reconstitution, and norovirus-specific antibody production. Samples were obtained in the peri-hematopoietic stem cell transplant setting (HSCT) before and after CNI clearance. The norovirus strain causing CNI was followed longitudinally for norovirus stool viral loads and sequencing.Results The noroviruses were identified as GII.4 Sydney[P4 New Orleans] in one patient and GII.17[P17] in the other. An exacerbation of diarrhea post-HSCT in the patient with X-SCID was consistent with norovirus infection but not with graft-vs-host-disease on pathologic samples. Both patients recovered polyfunctional NSTs in the CD4 and CD8 T cell compartments which recognized multiple norovirus structural and non-structural viral antigens. T cell responses were minimal during active CNI but detectable after resolution. Mapping of norovirus-specific T cell responses between the patient with DOCK8 and his matched sibling donor were nearly identical. B cell reconstitution or new endogenous antibody production for IgA or IgG were not observed.Conclusion This report is the first to demonstrate reconstitution of norovirus-specific T cell immunity after HSCT closely temporally aligned with clearance of CNI suggesting that cellular immunity is sufficient for norovirus clearance.
Læs mere Tjek på PubMedShun Liu, Hanyu Chen, Zihan Wen, Yaoling Ouyang, Bing Mei, Chengbin Li
Journal of Medical Virology, 7.08.2024
Tilføjet 7.08.2024
Journal of Infectious Diseases, 7.08.2024
Tilføjet 7.08.2024
Abstract Attributing infectious causes of diarrhea is critical to inform treatment and burden estimates. The attributable fraction (AF) approach based on the association between pathogen quantity and diarrhea has been frequently used but may underestimate incidence. We leveraged data from the multisite birth-cohort Malnutrition and Enteric Disease (MAL-ED) Study, where diarrheal and non-diarrheal stools were collected from 1,715 children from 0-2 years. We compared attribution using a longitudinal AF (LAF) method that considers the temporal association between pathogen quantity and diarrhea symptoms to previously-published AF estimates. For rotavirus and Shigella, attribution did not meaningfully change. For others like adenovirus 40 & 41, astrovirus, norovirus GII, sapovirus, Campylobacter jejuni or C coli, ST ETEC, typical EPEC, and Cryptosporidium, attribution increased, demonstrating longitudinal data may be informative for pathogens with weak associations between quantity and diarrhea. We further derived accuracy-based, pathogen-specific quantity cut-offs that may improve attribution in the absence of longitudinal data.
Læs mere Tjek på PubMedBMC Infectious Diseases, 1.08.2024
Tilføjet 1.08.2024
Abstract Background Viruses, which are transmitted mainly via the digestive tract, are responsible for the high morbidity and mortality of diseases, particularly in low-income countries. Although several studies have established the prevalence and characterization of various enteric viruses in Burkina Faso, to date, no aggregate data have been released. Objective Our objective was to describe the available data on the prevalence and circulating genotypes of enteric pathogen viruses responsible for human infections in Burkina Faso by carrying out a systematic review and meta-analysis. Methods Potentially relevant studies were identified by a search of PubMed, ScienceDirect, Google Scholar, university libraries and by a manual search of the reference lists of identified studies. The search with no restrictions on language or age was limited to studies conducted only in Burkina. Study selection, data extraction, and methodological quality of the included studies were performed independently by two investigators. Heterogeneity between studies was assessed using the Cochrane Q test and I2 test statistics based on the random effects model. Comprehensive meta-analysis (CMA 3.7) was employed to compute the pooled prevalence of pathogens identified in the studies. Results Forty-three (43) studies reporting 4,214 diagnosed cases in all aged human populations were selected. Overall, 72.6% of the pathogens diagnosed were gastroenteritis, and 27.2% were entero-transmissible hepatitis viruses. Rotavirus was the most common cause of human viral gastroenteritis, accounting for 27.7% (95% CI: 20.9 - 35.8) of the cases, followed by norovirus (16% (95% CI: 12.25 - 20.6)) and sapovirus (11.2% (95% CI: 6.2 - 19.4)). In terms of human entero-transmissible infections, hepatitis A virus (HAV) was the most prevalent (52% [95% CI: 14.2–87.7] of total antibodies), followed by hepatitis E virus (HEV) (28.3% [95% CI: 17.7–42]). Conclusions This study highlights the substantial burden of viral enteric infections and highlights the need for more molecular epidemiological studies to improve preventive measures against these viruses.
Læs mere Tjek på PubMedDaniel Haile Chercos, Solomon T. Wafula, John P. A. Lusingu, Daniel T. R. Minja, Samwel Gesase, Joyce R. Mbwana, Ulrich Schotte, Jürgen May, Lea Mardeis, Anna Jaeger, Sandra Rojak, Maike Lamshöft, Joseph Kaseka, Eva Lorenz, Hagen Frickmann, Denise Dekker
PLoS One Infectious Diseases, 19.06.2024
Tilføjet 19.06.2024
by Daniel Haile Chercos, Solomon T. Wafula, John P. A. Lusingu, Daniel T. R. Minja, Samwel Gesase, Joyce R. Mbwana, Ulrich Schotte, Jürgen May, Lea Mardeis, Anna Jaeger, Sandra Rojak, Maike Lamshöft, Joseph Kaseka, Eva Lorenz, Hagen Frickmann, Denise Dekker Diarrheal diseases are important causes of morbidity and mortality, worldwide. The occurrence of multiple pathogens in stool samples of symptomatic and asymptomatic individuals in resource-limited countries have been repeatedly described. In this study, we assessed the differentiated effects of combined pathogen detections on recorded symptoms. A case-control study was conducted among 620 under-five-year-old children in rural northeastern Tanzania with emphasis of multiple detection. The median age of children was 11 months (IQR = 7, 20), and 52.1% were male. Cases (50.2%, n = 157) were less likely than controls (64.5%, n = 198) to have multiple colonization with gastrointestinal tract (GIT) pathogens. The children’s age was positively associated with the likelihood of harboring multiple GIT pathogens [OR, 1.02, 95% CI = 1.01, 1.04]. Shigella spp./enteroinvasive Escherichia coli (EIEC) [OR = 2.80, 95% CI 1.62, 4.83] and norovirus [OR = 2.04, 95% CI 1.23, 3.39] were more common in cases and were strongly associated with diarrhea, while enteroaggregative E. coli (EAEC) [OR = 0.23, 95%CI 0.17–0.33] were more common in controls. Diarrheal diseases in under-five children from rural Tanzania are likely to be due to infections with Shigella spp./EIEC, and norovirus with strongly age-dependent associations.
Læs mere Tjek på PubMedBMC Infectious Diseases, 1.06.2024
Tilføjet 1.06.2024
Abstract Noroviruses are the second leading cause of death in children under the age of 5 years old. They are responsible for 200 million cases of diarrhoea and 50,000 deaths in children through the word, mainly in low-income countries. The objective of this review was to assess how the prevalence and genetic diversity of noroviruses have been affected by the introduction of rotavirus vaccines in Africa. PubMed, Web of Science and Science Direct databases were searched for articles. All included studies were conducted in Africa in children aged 0 to 5 years old with gastroenteritis. STATA version 16.0 software was used to perform the meta-analysis. The method of Dersimonian and Laird, based on the random effects model, was used for the statistical analyses in order to estimate the pooled prevalence’s at a 95% confidence interval (CI). Heterogeneity was assessed by Cochran’s Q test using the I2 index. The funnel plot was used to assess study publication bias. A total of 521 studies were retrieved from the databases, and 19 were included in the meta-analysis. The pooled norovirus prevalence’s for pre- and post-vaccination rotavirus studies were 15% (95 CI, 15–18) and 13% (95 CI, 09–17) respectively. GII was the predominant genogroup, with prevalence of 87.64% and 91.20% respectively for the pre- and post-vaccination studies. GII.4 was the most frequently detected genotype, with rates of 66.84% and 51.24% respectively for the pre- and post-vaccination studies. This meta-analysis indicates that rotavirus vaccination has not resulted in a decrease in norovirus infections in Africa.
Læs mere Tjek på PubMedTaojun He Yilin Deng Fang Zhang Jin Zhang Luhong Zhu Qinjin Wang Jie Ning Hui Wu Hanmei Yuan Bin Li Chao Wu a Department of Laboratory Medicine, The Eighth Affiliated Hospital of Sun Yat-sen University, Shenzhen, Guangdong, Chinab Department of Gastroenterology, The Eighth Affiliated Hospital of Sun Yat-sen University, Shenzhen, Guangdong, China
Virulence, 31.05.2024
Tilføjet 31.05.2024
Dessie Tegegne, Aschalew Gelaw, Dawit Hailu Alemayehu, Tamrayehu Seyoum, Dereje Leta, Getachew Ferede, Andargachew Mulu, Baye Gelaw
PLoS One Infectious Diseases, 22.05.2024
Tilføjet 22.05.2024
by Dessie Tegegne, Aschalew Gelaw, Dawit Hailu Alemayehu, Tamrayehu Seyoum, Dereje Leta, Getachew Ferede, Andargachew Mulu, Baye Gelaw Background Norovirus (NoV) is the leading cause of diarrheal disease worldwide and the impact is high in developing countries, including Ethiopia. Moreover, there is a significant and fluctuating global genetic diversity that varies across diverse environments over time. Nevertheless, there is a scarcity of data on the genetic diversity of NoV in Ethiopia. Objective This study was aimed to assess the genetic diversity and distribution of NoVs circulating in the Amhara National Regional State, Ethiopia, by considering all age groups. Methods A total of 519 fecal samples were collected from diarrheal patients from May 01/2021 to November 30/ 2021. The fecal samples were screened for the presence of NoVs using real-time RT-PCR by targeting a portion of the major capsid protein coding region. The positive samples were further amplified using conventional RT-PCR, and sequenced. Results The positivity rate of NoV was (8.9%; 46/519). The detection rate of NoV genogroup II (GII) and genogroup I (GI) was 38 (82.6%) and 8 (17.4%), respectively. Overall, five distinct GII (GII.3, GII.6, GII.10, GII.17, and GII.21) and two GI (GI.3 and GI.5) genotypes were detected. Within the GII types, GII.3 was the predominant (34.2%) followed by GII.21 (15.8%), GII.17 (10.5%), GII.6 and GII.10 each (2.6%). Norovirus GII.21 is reported for the first time in Ethiopia. The genetic diversity and distribution of NoVs were significantly different across the four sampling sits and age groups. The phylogenetic analysis revealed close relatedness of the current strains with published strains from Ethiopia and elsewhere. Conclusion The distribution and genetic diversity of NoV was considerably high, with predominance of non-GII.4 genotypes. The GII.21 genotype is a new add on the growing evidences on the genetic diversity of NoVs in Ethiopia. Future nationwide surveillance studies are necessary to gain comprehensive data in Ethiopia.
Læs mere Tjek på PubMedSarah Soueges, Valérie Cheynet, Thomas Briot, Claire Merveilleux du Vignaux, Nicolas Benech, Florence Ader
Clinical Microbiology and Infection, 1.05.2024
Tilføjet 1.05.2024
Norovirus (NoV) infections can lead to severe complications in immunocompromised patients (1). Nitazoxanide, ribavirin and intravenous (IV) or oral immunoglobulins (Ig) have shown limited efficacy (1,2). The gut microbiota has been described as impacting NoV infectivity and might constitute a therapeutic target (3), which can be modulated by faecal microbiota transplantation (FMT) (4).
Læs mere Tjek på PubMedJournal of Infectious Diseases, 20.04.2024
Tilføjet 20.04.2024
Abstract Background Quantitative molecular assays are increasingly used for detection of enteric viruses.Methods We compared the clinical severity using modified Vesikari score (mVS) of enteric viruses detected by conventional assays (enzyme immunoassays [EIA] for rotavirus and adenovirus 40/41 and conventional polymerase chain reaction for astrovirus, sapovirus, and norovirus) and a quantitative molecular assay (TaqMan Array Card [TAC]) among children aged 0-59 months in the Global Enteric Multicenter Study. For rotavirus and adenovirus 40/41, we compared severity between EIA-positive and TAC-positive cases assigned etiologies using different cycle threshold (CT) cutoffs.Results Using conventional assays, the median (interquartile range) mVS was 10 (8, 11) for rotavirus, 9 (7, 11) for adenovirus 40/41, 8 (6, 10) for astrovirus, sapovirus, and norovirus GII, and 7 (6, 9) for norovirus GI. Compared to rotavirus EIA-positive cases, the median mVS was 2 and 3 points lower for EIA-negative/TAC-positive cases with CT
Læs mere Tjek på PubMedInfection, 10.04.2024
Tilføjet 10.04.2024
Abstract Purpose Diarrhea is an important cause of morbidity and mortality in immunocompromised patients. After including sapovirus to the viral gastroenteritis screening of our institution’s laboratory, we noticed an increase in sapovirus infections among kidney transplant recipients. Therefore, we assumed former gastrointestinal tract infections with unidentified pathogens could have been caused by sapovirus. To better understand the characteristics of a sapovirus infection in a high-risk group we initiated this study. Methods Over a period of 6 months, all transplant recipients with diarrhea and later identified viral/unknown pathogens were included. Kidney function, levels of immunosuppressants and c-reactive protein, acid–base balance, onset of symptoms and time of hospitalization were analyzed. Results Among 13 hospitalized kidney transplant recipients sapovirus was detected in four patients, while in the remaining nine, three were diagnosed with norovirus, one with cytomegalovirus, one with inflammatory bowel disease and in four patients no pathogen was identified. Even though statistically not significant, creatinine levels at admission tended to be higher in sapovirus patients (median: sapovirus: 3.3 mg/dl (1.3; 5.0), non-sapovirus: 2.5 mg/dl (1.1; 4.9), p = 0.710). Also, Tacrolimus levels showed the same trend (sapovirus: 13.6 ng/ml (12.9; 13.6), non-sapovirus: 7.1 ng/ml (2.6; 22.6), p = 0.279). On discharge creatinine levels improved equally in both groups (sapovirus: 1.7 mg/dl (1.4; 3.2), non-sapovirus: 2 mg/dl (1.0; 3.6), p = 0.825). Conclusion In high-risk patients, early symptomatic treatment remains crucial to protect the transplant`s function. In our cohort all patients recovered well. Larger cohorts and longer follow-up times are needed to detect the long-term consequences and a potential need for further research regarding specific treatment. Trial registration The study has been registered on DRKS (trialsearch.who.int), Reg. Nr. DRKS00033311 (December 28th 2023).
Læs mere Tjek på PubMedInfection, 9.04.2024
Tilføjet 9.04.2024
Abstract Purpose Diarrhea is an important cause of morbidity and mortality in immunocompromised patients. After including sapovirus to the viral gastroenteritis screening of our institution’s laboratory, we noticed an increase in sapovirus infections among kidney transplant recipients. Therefore, we assumed former gastrointestinal tract infections with unidentified pathogens could have been caused by sapovirus. To better understand the characteristics of a sapovirus infection in a high-risk group we initiated this study. Methods Over a period of 6 months, all transplant recipients with diarrhea and later identified viral/unknown pathogens were included. Kidney function, levels of immunosuppressants and c-reactive protein, acid–base balance, onset of symptoms and time of hospitalization were analyzed. Results Among 13 hospitalized kidney transplant recipients sapovirus was detected in four patients, while in the remaining nine, three were diagnosed with norovirus, one with cytomegalovirus, one with inflammatory bowel disease and in four patients no pathogen was identified. Even though statistically not significant, creatinine levels at admission tended to be higher in sapovirus patients (median: sapovirus: 3.3 mg/dl (1.3; 5.0), non-sapovirus: 2.5 mg/dl (1.1; 4.9), p = 0.710). Also, Tacrolimus levels showed the same trend (sapovirus: 13.6 ng/ml (12.9; 13.6), non-sapovirus: 7.1 ng/ml (2.6; 22.6), p = 0.279). On discharge creatinine levels improved equally in both groups (sapovirus: 1.7 mg/dl (1.4; 3.2), non-sapovirus: 2 mg/dl (1.0; 3.6), p = 0.825). Conclusion In high-risk patients, early symptomatic treatment remains crucial to protect the transplant`s function. In our cohort all patients recovered well. Larger cohorts and longer follow-up times are needed to detect the long-term consequences and a potential need for further research regarding specific treatment. Trial registration The study has been registered on DRKS (trialsearch.who.int), Reg. Nr. DRKS00033311 (December 28th 2023).
Læs mere Tjek på PubMedJunshan Gao, Liang Xue, Yijing Li, Weicheng Cai, Shuidi Miao, Luobing Meng, Shaolei Ren, Jumei Zhang, Juan Wang, Shi Wu, Qinghua Ye, Ling Chen, Qihui Gu, Qingping Wu
Journal of Medical Virology, 14.03.2024
Tilføjet 14.03.2024