UK Variant COVID-19

2021 ◽  
pp. 601-604
Author(s):  
Manish Kumar Balai
Keyword(s):  
Diagnostic Method ◽  
Warning Signs ◽  
Antigenic Drift ◽  
Receptor Binding Domain ◽  
Rt Pcr ◽  
Genetic Sequencing ◽  
New Variant ◽  
Control And Prevention ◽  
Reliable Diagnostic Method ◽  
Breathing Problem

Virus has a nature of antigenic drift and shift so over time their genetic make-up changes through the mutation and emerged a new strain of virus. Six type of coronavirus are known to infect the human being till now. The latest one and seventh number coronavirus is COVID-19. Diseases caused by coronavirus ranging from common cold to severe acute respiratory syndrome (SARS-CoV). One more strain or mutant COVID-19 identified at UK in September 2020 and this strain is fast and quick spreading that is 70% more transmissible than the old strain. The first “Variant Under Investigation” in December -2020 in which most significant mutation known as N501Y change the protein spike (S) of the virus that is the receptor binding domain, used to bind the human ACE2 receptors. Five alarming warning signs of new strain of coronavirus are Breathing problem, Confusion, Persistent chest pain, Tired and unable to stay awake, Bluish lips or face. RT-PCR and genetic sequencing still reliable diagnostic method for new variant of corona. Control and prevention need to follow all guidelines which are following previously and till now many vaccines developed but scientist need more research and data for its efficacy on new variant of corona.

scholarly journals A new real-time PCR assay for rapid identification of the S. aureus/MRSA strains

2013 ◽  
Vol 61 (6) ◽  
pp. 1785-1792 ◽  
Author(s):  
Ivan Manga ◽  
Marcela Vyletělová
Keyword(s):  
Environmental Samples ◽  
Diagnostic Method ◽  
Gene Sequence ◽  
Limit Of Detection ◽  
Reference Method ◽  
Rt Pcr ◽  
Pcr Assay ◽  
Disk Diffusion Test ◽  
Reference Strains ◽  
Reliable Diagnostic Method

The Methicillin-resistant Staphylococcus aureus (MRSA) with the livestock-associated MRSA (LA-MRSA) are of great interest to scientists and general public. The aim of our study was to present a new more rapid and reliable diagnostic method working on the RT-PCR platform applicable for monitoring of MRSA/S. aureus. The parallel testing of the S. aureus specific nuc gene sequence and the mecA gene sequence was utilised for this purpose. A collection of ten S. aureus/MRSA reference strains, fifteen genetically related non S. aureus reference strains and fifty-six environmental samples was employed for estimation of the assay performance and parameters. The environmental samples acquired in the Czech livestock farms were represented with the livestock and human nasal mucosae or skin swabs, the slaughter meat swabs and were chosen preferentially from individuals with previously confi rmed or suspected positive MRSA/S. aureus cases. The classic selective cultivation approach with the biochemical test and agar disk diffusion test was accepted as reference diagnostic method. As there were no culture positive samples that were negative using RT-PCR, our method featured with 100% sensitivity in comparison to reference method. The limit of detection allowed to identify from tens to hundreds copies of S. aureus/MRSA genome. Further, the RT-PCR assay featured with 100% inclusivity and 95% exclusivity at Cq value below 30. These parameters suggested on powerful and reliable diagnostic method with real potential of practical utilisation. We consider our method as ideal for testing of individual suspected colonies, when the results can be acquired in less than 1.5 hour.

scholarly journals A New Variant among Newcastle Disease Viruses Isolated in the Democratic Republic of the Congo in 2018 and 2019

Viruses ◽  
2021 ◽  
Vol 13 (2) ◽  
pp. 151
Author(s):  
Augustin T. Twabela ◽  
Lam Thanh Nguyen ◽  
Justin Masumu ◽  
Patrick Mpoyo ◽  
Serge Mpiana ◽  
...  
Keyword(s):  
Newcastle Disease ◽  
Democratic Republic ◽  
Control Strategies ◽  
Farming Systems ◽  
Epidemiological Studies ◽  
Comprehensive Knowledge ◽  
Current Vaccine ◽  
New Variant ◽  
Control And Prevention ◽  
Republic Of The Congo

Newcastle disease (ND) is a highly transmissible and devastating disease that affects poultry and wild birds worldwide. Comprehensive knowledge regarding the characteristics and epidemiological factors of the ND virus (NDV) is critical for the control and prevention of ND. Effective vaccinations can prevent and control the spread of the NDV in poultry populations. For decades, the Democratic Republic of the Congo (DRC) has reported the impacts of ND on commercial and traditional poultry farming systems. The reports were preliminary clinical observations, and few cases were confirmed in the laboratory. However, data on the phylogenetic, genetic, and virological characteristics of NDVs circulating in the DRC are not available. In this study, the whole-genome sequences of three NDV isolates obtained using the next-generation sequencing method revealed two isolates that were a new variant of NDV, and one isolate that was clustered in the subgenotype VII.2. All DRC isolates were velogenic and were antigenically closely related to the vaccine strains. Our findings reveal that despite the circulation of the new variant, ND can be controlled in the DRC using the current vaccine. However, epidemiological studies should be conducted to elucidate the endemicity of the disease so that better control strategies can be implemented.

scholarly journals Comparison of two coprological methods for the veterinary diagnosis of fasciolosis

2005 ◽  
Vol 57 (2) ◽  
pp. 181-185 ◽  
Author(s):  
F. Kleiman ◽  
S. Pietrokovsky ◽  
S. Gil ◽  
C. Wisnivesky-Colli
Keyword(s):  
Endemic Area ◽  
Diagnostic Method ◽  
Staining Method ◽  
Fasciola Hepatica ◽  
False Negative ◽  
Sample Processing ◽  
Hepatica Infection ◽  
Sedimentation Method ◽  
Faecal Samples ◽  
Reliable Diagnostic Method

The sensitivity and utility of a standard faecal sedimentation method (FSM) and a modified stool sieving staining method (FSSM), both currently employed for the diagnosis of Fasciola hepatica infection were compared. Faecal samples were obtained from 51 bovines of an endemic area for fasciolosis in Southwestern Argentina. Each sample was placed in a recipient containing 5% formalin. Eight millilitres of the suspension, equivalent to 2g of faeces, were used for each of the two methods tested. The number of eggs found per sample was recorded. The proportion of positive samples obtained by the FSSM (27/51) was significantly higher than that by the FSM (11/51) (P<0.05). The percent of agreement between methods was 41%. Over a total of 27 positive samples detected by the FSSM, the FSM missed 16, yielding 60% false negative samples. The FSSM enhanced 2.5 times the sensitivity of diagnosis. The complexity of the FSM may decrease its sensitivity through missing and loss of eggs during sample processing. These results confirmed that the commonly used FSM underestimates the prevalence and the egg output in cattle and that the FSSM is a more reliable diagnostic method.

scholarly journals The Impact on Infectivity and Neutralization Efficiency of SARS-CoV-2 Lineage B.1.351 Pseudovirus

Viruses ◽  
2021 ◽  
Vol 13 (4) ◽  
pp. 633
Author(s):  
Yeong Jun Kim ◽  
Ui Soon Jang ◽  
Sandrine M. Soh ◽  
Joo-Youn Lee ◽  
Hye-Ra Lee
Keyword(s):  
South Africa ◽  
Monoclonal Antibodies ◽  
Cell Fusion ◽  
Receptor Binding ◽  
Neutralizing Antibodies ◽  
Receptor Binding Domain ◽  
Viral Spread ◽  
New Variant ◽  
Global Concern ◽  
The Impact

A new variant of SARS-CoV-2 B.1.351 lineage (first found in South Africa) has been raising global concern due to its harboring of multiple mutations in the spike that potentially increase transmissibility and yield resistance to neutralizing antibodies. We here tested infectivity and neutralization efficiency of SARS-CoV-2 spike pseudoviruses bearing particular mutations of the receptor-binding domain (RBD) derived either from the Wuhan strains (referred to as D614G or with other sites) or the B.1.351 lineage (referred to as N501Y, K417N, and E484K). The three different pseudoviruses B.1.351 lineage related significantly increased infectivity compared with other mutants that indicated Wuhan strains. Interestingly, K417N and E484K mutations dramatically enhanced cell–cell fusion than N501Y even though their infectivity were similar, suggesting that K417N and E484K mutations harboring SARS-CoV-2 variant might be more transmissible than N501Y mutation containing SARS-CoV-2 variant. We also investigated the efficacy of two different monoclonal antibodies, Casirivimab and Imdevimab that neutralized SARS-CoV-2, against several kinds of pseudoviruses which indicated Wuhan or B.1.351 lineage. Remarkably, Imdevimab effectively neutralized B.1.351 lineage pseudoviruses containing N501Y, K417N, and E484K mutations, while Casirivimab partially affected them. Overall, our results underscore the importance of B.1.351 lineage SARS-CoV-2 in the viral spread and its implication for antibody efficacy.

scholarly journals Utility of forensic detection of rabies virus in decomposed exhumed dog carcasses

2015 ◽  
Vol 86 (1) ◽  
Author(s):  
Wanda Markotter ◽  
Jessica Coertse ◽  
Kevin Le Roux ◽  
Joey Peens ◽  
Jacqueline Weyer ◽  
...  
Keyword(s):  
Rabies Virus ◽  
Gold Standard ◽  
Diagnostic Method ◽  
Diagnostic Testing ◽  
Domestic Dogs ◽  
Rt Pcr ◽  
Chain Reaction ◽  
Brain Material ◽  
Polymerase Chain ◽  
Genomic Material

This report describes four suspected rabies cases in domestic dogs that were involved inhuman exposures. In all these cases, the animals were buried for substantial times beforerabies testing was performed. Animal rabies is endemic in South Africa and domestic dogsare the main vector for transmission to humans. Diagnosis of rabies in humans is complicated,and diagnosis in the animal vector can provide circumstantial evidence to support clinicaldiagnosis of rabies in humans. The gold standard diagnostic method, fluorescent antibodytest (FAT), only delivers reliable results when performed on fresh brain material and thereforedecomposed samples are rarely submitted for diagnostic testing. Severely decomposed brainmaterial was tested for the presence of rabies virus genomic material using a quantitativereal-time reverse transcription polymerase chain reaction (q-real-time RT-PCR) assaywhen conventional molecular methods were unsuccessful. This may be a useful tool in theinvestigation of cases where the opportunity to sample the suspected animals post mortem wasforfeited and which would not be possible with conventional testing methodologies becauseof the decomposition of the material.

A Nosocomial Outbreak of Feline Calicivirus Associated Virulent Systemic Disease in France

2009 ◽  
Vol 11 (8) ◽  
pp. 633-644 ◽  
Author(s):  
Brice S. Reynolds ◽  
Hervé Poulet ◽  
Jean-Luc Pingret ◽  
Dominique Jas ◽  
Sylvie Brunet ◽  
...  
Keyword(s):  
Systemic Disease ◽  
Feline Calicivirus ◽  
Nosocomial Outbreak ◽  
Rt Pcr ◽  
Genetic Sequencing ◽  
Viral Excretion ◽  
Clinicopathological Findings ◽  
The Us ◽  
Sequencing Studies ◽  
Polymerase Chain

This report describes a nosocomial outbreak of feline calicivirus (FCV) associated virulent systemic disease (VSD) in a French veterinary teaching hospital in 2005. The outbreak started in March and resolved within 1 month. Signs, clinical course, clinicopathological findings and lesions were typical of FCV-induced VSD. FCV infection was confirmed by quantitative reverse transcriptase-polymerase chain reaction (RT-PCR). Among the eight infected cats, two had to be euthanased, three died, and three recovered after medical treatment. Virus could not be confined inside the animal hospital and on two occasions, students' own cats became infected. Subsequent genetic sequencing studies confirmed that the eight cats were infected with the same strain of virus, and that it was distinct from those involved in the US and UK outbreaks of VSD. Virulence and viral excretion patterns of the isolated strain were further characterised by experimental infection.

scholarly journals SARS-CoV-2 re-positivity within the first 3 months of COVID-19 recovery; probable re-infection

2021 ◽  
Author(s):  
sara sadr ◽  
Melika Arab Bafrani ◽  
Alireza Abdollahi ◽  
SeyedAhmad SeyedAlinaghi ◽  
Esmaeil Mohammadnejad ◽  
...  
Keyword(s):  
Herd Immunity ◽  
Rt Pcr ◽  
Complete Protection ◽  
Genetic Sequencing ◽  
Serum Igg ◽  
Follow Up Studies ◽  
Positive Results

Objectives Possibility of reinfection with SARS-CoV-2 changes our view on herd immunity and vaccination, and can impact worldwide quarantine policies. We performed RT-PCR follow-up studies on recovered patients to assess possible development of reinfections and re-positivity. Method During a 6-month period, 202 PCR-confirmed recovering COVID-19 patients entered this study. Follow-up RT-PCR tests and symptoms assessment were performed one month after the initial Positive results. patients who tested negative were tested again one and three months later. The Serum IgG and IgM levels were measured in the last follow-up session. Results In the first two follow-up sessions, 82 patients continued their participation, of which four patients tasted positive. In the second follow-up 44 patients participated, three of whom tested positive. None of the patients who tested positive in the first and second follow-up session were symptomatic. In the last session, 32 patients were tested and four patients were positive, three of them were mildly symptomatic and all of them were positive for IgG. Conclusion A positive RT-PCR in a recovering patient may represent reinfection. While we did not have the resources to prove reinfection by genetic sequencing of the infective viruses, we believe presence of mild symptoms in the three patients who tested positive over 100 days after becoming asymptomatic, can be diagnosed as reinfection. The IgG may have abated the symptoms of the reinfection, without providing complete protection.

Impact of the B.1.1.7 variant on neutralizing monoclonal antibodies recognizing diverse epitopes on SARS–CoV–2 Spike

2021 ◽  
Author(s):  
Carl Graham ◽  
Jeffrey Seow ◽  
Isabella Huettner ◽  
Hataf Khan ◽  
Neophytos Kouphou ◽  
...  
Keyword(s):  
Monoclonal Antibodies ◽  
Viral Entry ◽  
Neutralizing Antibodies ◽  
Infectious Virus ◽  
Antigenic Drift ◽  
Host Cells ◽  
Receptor Binding Domain ◽  
Neutralization Activity ◽  
Neutralizing Activity ◽  
Neutralizing Epitopes

The interaction of the SARS–CoV–2 Spike receptor binding domain (RBD) with the ACE2 receptor on host cells is essential for viral entry. RBD is the dominant target for neutralizing antibodies and several neutralizing epitopes on RBD have been molecularly characterized. Analysis of circulating SARS–CoV–2 variants has revealed mutations arising in the RBD, the N–terminal domain (NTD) and S2 subunits of Spike. To fully understand how these mutations affect the antigenicity of Spike, we have isolated and characterized neutralizing antibodies targeting epitopes beyond the already identified RBD epitopes. Using recombinant Spike as a sorting bait, we isolated >100 Spike–reactive monoclonal antibodies from SARS–CoV–2 infected individuals. ≈45% showed neutralizing activity of which ≈20% were NTD–specific. None of the S2–specific antibodies showed neutralizing activity. Competition ELISA revealed that NTD–specific mAbs formed two distinct groups: the first group was highly potent against infectious virus, whereas the second was less potent and displayed glycan–dependant neutralization activity. Importantly, mutations present in B.1.1.7 Spike frequently conferred resistance to neutralization by the NTD–specific neutralizing antibodies. This work demonstrates that neutralizing antibodies targeting subdominant epitopes need to be considered when investigating antigenic drift in emerging variants.

scholarly journals Cytokine Signature Associated with Disease Severity in Dengue

Viruses ◽  
2019 ◽  
Vol 11 (1) ◽  
pp. 34 ◽  
Author(s):  
A. Raj Kumar Patro ◽  
Sriprasad Mohanty ◽  
Birendra K. Prusty ◽  
Diwakar K. Singh ◽  
Sagar Gaikwad ◽  
...  
Keyword(s):  
Disease Severity ◽  
Viral Disease ◽  
Warning Signs ◽  
Severe Dengue ◽  
Rt Pcr ◽  
Capture Elisa ◽  
Gm Csf ◽  
Host Immune Responses ◽  
Luminex Assay ◽  
Ifn Γ

Dengue is the most rapidly spreading viral disease transmitted by the bite of infected Aedes mosquitos. The pathogenesis of dengue is still unclear; although host immune responses and virus serotypes have been proposed to contribute to disease severity. In this study, we examined the circulating dengue virus (DENV) and measured plasma levels of inflammatory mediators. Ninety-eight patients during a dengue outbreak in eastern India in 2016 were included in the study. The presence of DENV was demonstrated by detecting NS1 antigen; IgM capture ELISA and serotypes were discriminated by type-specific RT-PCR and/or sequencing. Plasma samples were assayed for 41-plex cytokine/chemokines using multiplex Luminex assay. Eighty-five (87%) samples were positive by NS1/IgM capture ELISA/RT-PCR. All four serotypes of DENV were detected in this outbreak, with DENV-2 as the predominant type, seen in 55% of cases. Mixed infections were seen in 39% of subjects. Among the host inflammatory biomarkers, GM-CSF, IFN-γ, IL-10, IL-15, IL-8, MCP-1, IL-6, MIP-1β, and TNF-α levels were significantly increased in dengue with and without warning signs, in severe dengue patients in comparison to healthy controls. Four cytokines IFN-γ, GM-CSF, IL-10, and MIP-1β correlated significantly with disease severity and could serve as potential predictor for disease severity. Information on the host biomarkers and the dengue serotype may help guide in optimizing effective intervention strategies.

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