positive results
Recently Published Documents





2022 ◽  
Vol 8 (2) ◽  
Seyed Ahmad Raeissadat ◽  
Seyed Mansoor Rayegani ◽  
Nafisseh Jafarian ◽  
Mina Heidari

Aim: Autologous conditioned serum has been studied as a treatment option in musculoskeletal disorders and resulted in varying outcomes. This study aims to pool the current data on this matter. Materials & methods: Major databases were searched for the topics, and after screening the results, the final 21 papers (level of evidence I or II) were included. Results & conclusion: This study showed a major focus of the literature on the effectiveness of autologous conditioned serum in osteoarthritis, in which there is much high-quality evidence suggesting its safety and efficacy. Also, some of the available experiments are assessing its application in tendinopathies and radiculopathies which, despite positive results, recommend further evaluations on this topic.

Pathogens ◽  
2022 ◽  
Vol 11 (1) ◽  
pp. 98
Edyta Świętoń ◽  
Kamila Dziadek ◽  
Krzysztof Śmietanka

Bornaviruses are a diverse family of viruses infecting various hosts, including birds. Aquatic bird bornavirus 1 (ABBV-1) and aquatic bird bornavirus 2 (ABBV-2) have been found in wild waterfowl but data on their prevalence are scarce. To gain knowledge on the occurrence of ABBVs in Poland, samples originating from dead birds of the Anseriformes order collected in 2016–2021 were tested with a real time RT-PCR method targeting the ABBVs genome. A total of 514 birds were examined, including 401 swans, 96 ducks and 17 geese. The presence of ABBV-1 RNA was detected in 52 swans (10.1% of all tested birds) from 40 different locations. No positive results were obtained for ducks and geese. Sequences of about 2300 bases were generated for 18 viruses and phylogenetic analysis was performed. A relatively low genetic diversity of the examined ABBV-1 strains was observed as all were gathered in a single cluster in the phylogenetic tree and the minimum nucleotide identity was 99.14%. The Polish strains were closely related to ABBV-1 identified previously in Denmark and Germany, but a limited number of sequences from Europe hinders the drawing of conclusions about interconnections between Polish and other European ABBVs. The results of the present study provide new insights into the distribution and genetic characteristics of ABBVs in wild birds in Europe.

Andrea Mancusi ◽  
Federico Capuano ◽  
Santa Girardi ◽  
Orlandina Di Maro ◽  
Elisabetta Suffredini ◽  

Bivalve shellfish are readily contaminated by human pathogens present in waters impacted by municipal sewage, and the detection of SARS-CoV-2 in feces of infected patients and in wastewater has drawn attention to the possible presence of the virus in bivalves. The aim of this study was to collect data on SARS-CoV-2 prevalence in bivalve mollusks from harvesting areas of Campania region. A total of 179 samples were collected between September 2019 and April 2021 and were tested using droplet digital RT-PCR (dd RT-PCR) and real-time RT-PCR. Combining results obtained with different assays, SARS-CoV-2 presence was detected in 27/179 (15.1%) of samples. A median viral concentration of 1.1 × 102 and 1.4 × 102 g.c./g was obtained using either Orf1b nsp14 or RdRp/gene E, respectively. Positive results were unevenly distributed among harvesting areas and over time, positive samples being more frequent after January 2021. Partial sequencing of the spike region was achieved for five samples, one of which displaying mutations characteristic of the Alpha variant (lineage B.1.1.7). This study confirms that bivalve mollusks may bioaccumulate SARS-CoV-2 to detectable levels and that they may represent a valuable approach to track SARS-CoV-2 in water bodies and to monitor outbreak trends and viral diversity.

2022 ◽  
Jack Albright ◽  
Eran Mick ◽  
Estella Sanchez-Guerrero ◽  
Jack Kamm ◽  
Anthea Mitchell ◽  

Abstract The continued emergence of SARS-CoV-2 variants is one of several factors that may cause false negative viral PCR test results. Such tests are also susceptible to false positive results due to trace contamination from high viral titer samples. Host immune response markers provide an orthogonal indication of infection that can mitigate these concerns when combined with direct viral detection. Here, we leverage nasopharyngeal swab RNA-seq data from patients with COVID-19, other viral acute respiratory illnesses and non-viral conditions (n=318) to develop support vector machine classifiers that rely on a parsimonious 2-gene host signature to predict COVID-19. Optimal classifiers achieve an area under the receiver operating characteristic curve (AUC) greater than 0.9 when evaluated on an independent RNA-seq cohort (n=553). We show that a classifier relying on a single interferon-stimulated gene, such as IFI6 or IFI44, measured in RT-qPCR assays (n=144) achieves AUC values as high as 0.88. Addition of a second gene, such as GBP5, significantly improves the specificity compared to other respiratory viruses. The performance of a clinically practical 2-gene RT-qPCR classifier is robust across common SARS-CoV-2 variants, including Omicron, and is unaffected by cross-contamination, demonstrating its utility for improving accuracy of COVID-19 diagnostics.

Wanru Guo ◽  
Xuewen Feng ◽  
Ming Hu ◽  
Yanwan Shangguan ◽  
Jiafeng Xia ◽  

BackgroundFever of unknown origin (FUO) is still a challenge for clinicians. Next-generation sequencing technologies, such as whole exome sequencing (WES), can be used to identify genetic defects in patients and assist in diagnosis. In this study, we investigated the application of WES in individuals with FUO.MethodsWe performed whole-exome sequencing on 15 FUO patients. Clinical information was extracted from the hospital information system.ResultsIn 7/15 samples, we found positive results, including potentially causative mutations across eight different genes: CFTR, CD209, IRF2BP2, ADGRV 1, TYK2, MEFV, THBD and GATA2.ConclusionsOur results show that whole-exome sequencing can promote the genetic diagnosis and treatment of patients with FUO.

2022 ◽  
Vol 12 (1) ◽  
Arantxa Valdivia ◽  
Fabián Tarín ◽  
María Jesús Alcaraz ◽  
Paula Piñero ◽  
Ignacio Torres ◽  

AbstractThe performance of a laboratory-developed IgG/IgA flow cytometry-based immunoassay (FCI) using Jurkat T cells stably expressing full-length native S protein was compared against Elecsys electrochemiluminiscent (ECLIA) Anti-SARS-CoV-2 S (Roche Diagnostics, Pleasanton, CA, USA), and Liaison SARS-CoV-2 TrimericS IgG chemiluminiscent assay (CLIA) (Diasorin S.p.a, Saluggia, IT) for detection of SARS-CoV-2-specific antibodies. A total of 225 serum/plasma specimens from 120 acute or convalescent COVID-19 individuals were included. Overall, IgG/IgA-FCI yielded the highest number of positives (n = 179), followed by IgA-FCI (n = 177), Roche ECLIA (n = 175), IgG-FCI (n = 172) and Diasorin CLIA (n = 154). For sera collected early after the onset of symptoms (within 15 days) IgG/IgA-FCI also returned the highest number of positive results (52/72; 72.2%). Positive percent agreement between FCI and compared immunoassays was highest for Roche ECLIA, ranging from 96.1 (IgG/IgA-FCI) to 97.7% (IgG-FCI), whereas negative percent agreement was higher between FCI and Diasosin CLIA, regardless of antibody isotype. The data suggest that FCI may outperform Roche ECLIA and Diasorin CLIA in terms of clinical sensitivity for serological diagnosis of SARS-CoV-2 infection.

2022 ◽  
Vol 73 ◽  
pp. 231-276
Dominik Peters ◽  
Lan Yu ◽  
Hau Chan ◽  
Edith Elkind

A preference profile is single-peaked on a tree if the candidate set can be equipped with a tree structure so that the preferences of each voter are decreasing from their top candidate along all paths in the tree. This notion was introduced by Demange (1982), and subsequently Trick (1989b) described an efficient algorithm for deciding if a given profile is single-peaked on a tree. We study the complexity of multiwinner elections under several variants of the Chamberlin–Courant rule for preferences single-peaked on trees. We show that in this setting the egalitarian version of this rule admits a polynomial-time winner determination algorithm. For the utilitarian version, we prove that winner determination remains NP-hard for the Borda scoring function; indeed, this hardness results extends to a large family of scoring functions. However, a winning committee can be found in polynomial time if either the number of leaves or the number of internal vertices of the underlying tree is bounded by a constant. To benefit from these positive results, we need a procedure that can determine whether a given profile is single-peaked on a tree that has additional desirable properties (such as, e.g., a small number of leaves). To address this challenge, we develop a structural approach that enables us to compactly represent all trees with respect to which a given profile is single-peaked. We show how to use this representation to efficiently find the best tree for a given profile for use with our winner determination algorithms: Given a profile, we can efficiently find a tree with the minimum number of leaves, or a tree with the minimum number of internal vertices among trees on which the profile is single-peaked. We then explore the power and limitations of this framework: we develop polynomial-time algorithms to find trees with the smallest maximum degree, diameter, or pathwidth, but show that it is NP-hard to check whether a given profile is single-peaked on a tree that is isomorphic to a given tree, or on a regular tree.

2022 ◽  
Vol 354 (11-12) ◽  
pp. 36-39
V. V. Mikhailova ◽  
T. P. Lobova ◽  
M. S. Shishkina ◽  
A. N. Skvortsova

Relevance. The reproductive health of dairy cows is one of the top priorities in dairy farming. Viral diarrhea, a disease of mucous membranes in cattle, is one of the causes of impaired reproductive function on farms. The disease is widespread throughout the world and causes significant economic damage, which consists of a decrease in productivity, lack of offspring, impaired reproductive function of the broodstock, costs of treatment and specific prevention. The viral diarrhea virus has an immunosuppressive effect. Diagnosis is complicated by a “blurry” clinical picture due to the association of the virus with other respiratory-intestinal viruses and the addition of a secondary bacterial infection, as well as the presence of a persistent form of infection. The diagnosis requires the analysis of clinical and epizootic data, pathological changes and a combination of several methods of laboratory diagnostics. An important link in the prevention and recovery of herds is the conduct of epizootic monitoring and analysis of its results.Methodology. The assessment of the epizootic situation for viral diarrhea, a disease of mucous membranes in cattle in the Russian Federation for 2020, was carried out based on the results of the analysis of information obtained from annual reports provided by state veterinary laboratories in the FSBI CNMVL in the form of 4-vet (annual).Results. Based on the results of the epizootic monitoring, it can be concluded that the viral diarrhea virus is widely circulating in the livestock farms of the Russian Federation. In 2020, positive results were recorded in all federal districts of the Russian Federation (in 33 subjects), except for the Far Eastern Federal District. The most difficult epizootic situation is in the North Caucasus Federal District and the Central Federal District (38% and 29% of the total number of positive results, respectively).

Biosensors ◽  
2022 ◽  
Vol 12 (1) ◽  
pp. 34
Sakandar Rauf ◽  
Nouran Tashkandi ◽  
José Ilton de Oliveira Filho ◽  
Claudia Iluhí Oviedo-Osornio ◽  
Muhammad S. Danish ◽  

Biological water contamination detection-based assays are essential to test water quality; however, these assays are prone to false-positive results and inaccuracies, are time-consuming, and use complicated procedures to test large water samples. Herein, we show a simple detection and counting method for E. coli in the water samples involving a combination of DNAzyme sensor, microfluidics, and computer vision strategies. We first isolated E. coli into individual droplets containing a DNAzyme mixture using droplet microfluidics. Upon bacterial cell lysis by heating, the DNAzyme mixture reacted with a particular substrate present in the crude intracellular material (CIM) of E. coli. This event triggers the dissociation of the fluorophore-quencher pair present in the DNAzyme mixture leading to a fluorescence signal, indicating the presence of E. coli in the droplets. We developed an algorithm using computer vision to analyze the fluorescent droplets containing E. coli in the presence of non-fluorescent droplets. The algorithm can detect and count fluorescent droplets representing the number of E. coli present in the sample. Finally, we show that the developed method is highly specific to detect and count E. coli in the presence of other bacteria present in the water sample.

2022 ◽  
pp. 63-72
Jutima Methaneethorn ◽  
Janthima Methaneethorn

Background: This systematic review aimed to summarise an application of team-based learning (TBL) in pharmacokinetics courses, to compare the learning outcomes of TBL to that of traditional lecture-based courses, and to identify the benefits of using a TBL strategy in pharmacokinetics courses. Method: PubMed, Scopus, and ERIC EBSCO databases were systematically searched, and 191 non-redundant articles were retrieved. Of these, seven articles were included. Results: Implementation of a TBL in pharmacokinetic courses resulted in several positive results including higher examination grades, improvement in professionalism aspects such as altruism, accountability, and honesty. Student engagement, peer learning, and the development of transferable skills could also be observed. Despite these positive benefits, some challenges exist, such as an increase in initial workload for faculty members, preparation of appropriate assignments, and suitable strategy to facilitate students. Conclusion: Future TBL implementation should be critically designed to optimise faculties’ workload and students’ engagement to the course.

Sign in / Sign up

Export Citation Format

Share Document