scholarly journals The Immungenicity and Cross-Neutralizing Activity of Enterovirus 71 Vaccine Candidate Strains

Zoonoses ◽  
2021 ◽  
Vol 1 (1) ◽  
Author(s):  
Xia Xiao ◽  
Kangping Zhou ◽  
Meirong Gu ◽  
Guoshun Li ◽  
Yuan Li ◽  
...  
Keyword(s):  
Vaccine Candidate ◽  
Sequence Similarity ◽  
Enterovirus 71 ◽  
Candidate Vaccine ◽  
Clinical Samples ◽  
Post Inoculation ◽  
Neutralizing Activity ◽  
Neutralization Capacity ◽  
Neutralizing Capacity ◽  
Cross Neutralization

Objective: This study aimed to evaluate enterovirus 71 (EV-A71) vaccine candidate strains, including their genotypes, immunogenicity and cross-neutralization capacity. Methods: From clinical samples, EV-A71 strains were separated by using Vero cells. Six strains were chosen for vaccine candidates, and the sequences were analyzed. To detect the immunogenicity of the strains, we used them to immunize NIH mice at 0 and 14 days. Cytopathic effects (CPE) were examined to determine the EV-A71 neutralizing antibody (NTAb) titer 14 d after the first and second inoculations. To evaluate the cross-neutralizing capacity of the EV-A71 vaccine candidate strains, we tested serum immunized mice with ten EV-A71 genotype strains. Results: Six EV-A71 vaccine candidate strains were identified, all belonging to sub-genotype C4, the prevalent genotype in China. The sequence similarity of the VP1 regions of the six candidate vaccine strains and three approved inactivated vaccines was 97.58%–97.77%, and the VP1 amino acid similarity was 98.65%–99.33%. Experiments were performed to evaluate the immunogenicity and cross-neutralizing activity of the EV-A71 vaccine candidate strains. The strains had good immunogenicity 14 d after two immunizations, inducing an NTAb titer ranging from 1:94 to 1:346. The NTAb seroconversion rates 14 d after one immunization were above 80% (except HB0007), and significantly increased immunogenicity of EV-A71 strains was observed post-inoculation. Furthermore, our candidate vaccine strains had broad cross-neutralizing activity after challenge with ten sub-genotypes of EV-A71. The highest NTAb titer/lowest NTAb titer ratios of sera against EV-A71 sub-genotypes were 8.0 (JS0002), 8.0 (JS0005), 21.3 (HB0005), 21.3 (HB0007), 10.7 (HB0040) and 8.0 (GD0002), respectively. Conclusions: Our EV-A71 strains had good immunogenicity and cross-neutralization activity, and have the potential to serve as vaccine strains for multivalent hand, foot and mouth disease vaccines.

scholarly journals An Optimized High-Throughput Neutralization Assay for Hepatitis E Virus (HEV) Involving Detection of Secreted Porf2

Viruses ◽  
2019 ◽  
Vol 11 (1) ◽  
pp. 64 ◽  
Author(s):  
Chang Liu ◽  
Wei Cai ◽  
Xin Yin ◽  
Zimin Tang ◽  
Guiping Wen ◽  
...  
Keyword(s):  
High Throughput ◽  
Hepatitis E Virus ◽  
Hepatitis E ◽  
Neutralization Assay ◽  
The Novel ◽  
Specific Antibodies ◽  
Neutralizing Activity ◽  
Elisa Kit ◽  
Neutralizing Capacity ◽  
Potential Threshold

Hepatitis E virus (HEV) is a common cause of acute hepatitis worldwide. Current methods for evaluating the neutralizing activity of HEV-specific antibodies include immunofluorescence focus assays (IFAs) and real-time PCR, which are insensitive and operationally complicated. Here, we developed a high-throughput neutralization assay by measuring secreted pORF2 levels using an HEV antigen enzyme-linked immunosorbent assay (ELISA) kit based on the highly replicating HEV genotype (gt) 3 strain Kernow. We evaluated the neutralizing activity of HEV-specific antibodies and the sera of vaccinated individuals (n = 15) by traditional IFA and the novel assay simultaneously. A linear regression analysis shows that there is a high degree of correlation between the two assays. Furthermore, the anti-HEV IgG levels exhibited moderate correlation with the neutralizing titers of the sera of vaccinated individuals, indicating that immunization with gt 1 can protect against gt 3 Kernow infection. We then determined specificity of the novel assay and the potential threshold of neutralizing capacity using anti-HEV IgG positive sera (n = 27) and anti-HEV IgG negative sera (n = 23). The neutralizing capacity of anti-HEV IgG positive sera was significantly stronger than that of anti-HEV IgG negative. In addition, ROC curve analysis shows that the potential threshold of neutralizing capacity of sera was 8.07, and the sensitivity and specificity of the novel assay was 88.6% and 100%, respectively. Our results suggest that the neutralization assay using the antigen ELISA kit could be a useful tool for HEV clinical research.

scholarly journals The Cross-Neutralizing Activity of Enterovirus 71 Subgenotype C4 Vaccines in Healthy Chinese Infants and Children

PLoS ONE ◽  
2013 ◽  
Vol 8 (11) ◽  
pp. e79599 ◽  
Author(s):  
Qunying Mao ◽  
Tong Cheng ◽  
Fengcai Zhu ◽  
Jingxin Li ◽  
Yiping Wang ◽  
...  
Keyword(s):  
Enterovirus 71 ◽  
Infants And Children ◽  
Neutralizing Activity ◽  
Healthy Chinese ◽  
The Cross

scholarly journals Delmarva (DMV/1639) Infectious Bronchitis Virus (IBV) Variants Isolated in Eastern Canada Show Evidence of Recombination

Viruses ◽  
2019 ◽  
Vol 11 (11) ◽  
pp. 1054 ◽  
Author(s):  
Mohamed S. H. Hassan ◽  
Davor Ojkic ◽  
Carla S. Coffin ◽  
Susan C. Cork ◽  
Frank van der Meer ◽  
...  
Keyword(s):  
Infectious Bronchitis Virus ◽  
Genomic Sequence ◽  
Sequence Similarity ◽  
Clinical Samples ◽  
Complete Genomic Sequence ◽  
Eastern Canada ◽  
Diagnostic Laboratory ◽  
Infectious Bronchitis ◽  
Show Evidence ◽  
Complete Genomic

Infectious bronchitis virus (IBV) infection in chickens can lead to an economically important disease, namely, infectious bronchitis (IB). New IBV variants are continuously emerging, which complicates vaccination-based IB control. In this study, five IBVs were isolated from clinical samples submitted to a diagnostic laboratory in Ontario, Canada, and subjected to detailed molecular characterization. Analysis of the spike (S)1 gene showed that these five IBVs were highly related to the Delmarva (DMV/1639) strain (~97.0% nucleotide sequence similarity) that was firstly isolated from an IB outbreak in the Delmarva peninsula, United States of America (USA), in 2011. However, the complete genomic sequence analysis showed a 93.5–93.7% similarity with the Connecticut (Conn) vaccine strain, suggesting that Conn-like viruses contributed to the evolution of the five Canadian IBV/DMV isolates. A SimPlot analysis of the complete genomic sequence showed evidence of recombination for at least three different IBV strains, including a Conn vaccine-like strain, a 4/91 vaccine-like strain, and one strain that is yet-unidentified. The unidentified strain may have contributed the genomic regions of the S, 3, and membrane (M) genes of the five Canadian IBV/DMV isolates. The study outcomes add to the existing knowledge about involvement of recombination in IBV evolution.

scholarly journals Echovirus 4 associated to hand, foot and mouth disease

2006 ◽  
Vol 48 (4) ◽  
pp. 197-199 ◽  
Author(s):  
Denise Hage Russo ◽  
Adriana Luchs ◽  
Bráulio Caetano Machado ◽  
Rita de Cássia Carmona ◽  
Maria do Carmo Sampaio Timenetsky
Keyword(s):  
Enterovirus 71 ◽  
Foot And Mouth Disease ◽  
Immunofluorescence Assay ◽  
Mouth Disease ◽  
Epidemiological Surveillance ◽  
Clinical Samples ◽  
Rt Pcr ◽  
Enteroviral Infection ◽  
Two Samples ◽  
Foot And Mouth

Hand, foot and mouth disease (HFMD) is a contagious enteroviral infection occurring primarily in children and characterized by vesicular palmoplantar eruptions and erosive stomatitis. Echovirus 4 (EV-4) has been commonly associated with aseptic meningitis. The association of HFMD with EV-4 has not been reported previously. Two samples of a 14-month child who presented mild fever, sores in the mouth, rash with blisters on the palm of hands and soles of feet were sent to Enteric Viruses Laboratory of Adolfo Lutz Institute. Clinical samples were inoculated in three different cell lines, and those which presented cytopathic effect (CPE), were submitted to Indirect Immunofluorescence Assay (IFA) and "one step" RT-PCR. Agarose gel electrophoresis from RT-PCR product, showed a product with 437 bp, which is characteristic of Enterovirus group. Echovirus 4 was identified by IFA. Although HFMD is a viral infection associated mainly with Enterovirus 71 (HEV-71) and Coxsackievirus A16 (CV-A16), our results demonstrate a diversity of serotype related to HFMD and stress the importance of epidemiological surveillance to this disease and its complications.

scholarly journals Prediction of Protection against Asian Enterovirus 71 Outbreak Strains by Cross-neutralizing Capacity of Serum from Dutch Donors, The Netherlands

2016 ◽  
Vol 22 (9) ◽  
pp. 1562-1569 ◽  
Author(s):  
Sabine M.G. van der Sanden ◽  
Gerrit Koen ◽  
Hetty van Eijk ◽  
Sylvie M. Koekkoek ◽  
Menno D. de Jong ◽  
...  
Keyword(s):  
The Netherlands ◽  
Enterovirus 71 ◽  
Neutralizing Capacity

scholarly journals Serum metabolite markers of early Mycoplasma hyopneumoniae infection in pigs

2019 ◽  
Vol 50 (1) ◽  
Author(s):  
Meera Surendran Nair ◽  
Dan Yao ◽  
Chi Chen ◽  
Maria Pieters
Keyword(s):  
Fatty Acids ◽  
Serum Levels ◽  
Mycoplasma Hyopneumoniae ◽  
Lavage Fluid ◽  
Clinical Samples ◽  
Post Inoculation ◽  
Swine Production ◽  
Physiological Mechanisms ◽  
Host Metabolism ◽  
Metabolite Markers

AbstractMycoplasma hyopneumoniae, the primary pathogenic bacterium causing enzootic pneumonia, significantly affects worldwide swine production. The infection is usually persistent and bacterial identification and isolation of M. hyopneumoniae in clinical samples are challenging due to the fastidious requirements for its growth. Hence, new practical surveillance tools that improve or complement existing diagnostics on M. hyopneumoniae are desirable, especially in early infection. The objective of this study was to identify potential metabolite markers of early M. hyopneumoniae infection in pigs through metabolomics analysis. Samples obtained from pigs in a previous M. hyopneumoniae experimental infection were used in this study. Briefly, two pigs served as mock inoculated controls and ten pigs were intra-tracheally inoculated with M. hyopneumoniae. Sera, laryngeal swabs (LS), and tracheo-bronchial lavage fluid (TBLF) were collected from all pigs at 0, 2, 5, 9, 14, 21 and 28 days post-inoculation (dpi). Bronchial swabs (BS) were collected post-mortem at 28 dpi. Mycoplasma hyopneumoniae infection was confirmed by PCR in LS, TBLF and BS. Serum metabolites were profiled using high-resolution liquid chromatography–mass spectrometry (LC–MS) analysis. Metabolite markers were identified by structural analysis following multivariate analysis of LC–MS data. The results showed that M. hyopneumoniae infection time-dependently altered the serum levels of selective amino acids and fatty acids. α-Aminobutyric acid and long-chain fatty acids were markedly increased at 14 and 21 dpi in inoculated pigs (p < 0.05). These results indicated that M. hyopneumoniae infection caused systemic changes in host metabolism, warranting further studies to determine underlying biochemical and physiological mechanisms responsible for the observed changes.

Corrigendum to “Protection of mice from Mycobacterium tuberculosis by ID87/GLA-SE, a novel tuberculosis subunit vaccine candidate” [Vaccine 29 (2011) 7842–7848]

Vaccine ◽  
2012 ◽  
Vol 31 (1) ◽  
pp. 278
Author(s):  
Hillarie Plessner Windish ◽  
Malcolm S. Duthie ◽  
Ayesha Misquith ◽  
Greg Ireton ◽  
Elyse Lucas ◽  
...  
Keyword(s):  
Mycobacterium Tuberculosis ◽  
Subunit Vaccine ◽  
Vaccine Candidate ◽  
Candidate Vaccine

scholarly journals Neisseria oralis sp. nov., isolated from healthy gingival plaque and clinical samples

2013 ◽  
Vol 63 (Pt_4) ◽  
pp. 1323-1328 ◽  
Author(s):  
William J. Wolfgang ◽  
Teresa V. Passaretti ◽  
Reashma Jose ◽  
Jocelyn Cole ◽  
An Coorevits ◽  
...  
Keyword(s):  
Type Strain ◽  
Type Species ◽  
Novel Species ◽  
Sequence Similarity ◽  
23S Rrna ◽  
Clinical Samples ◽  
Rrna Gene ◽  
The Novel ◽  
Content Type ◽  
Link Type

A polyphasic analysis was undertaken of seven independent isolates of Gram-negative cocci collected from pathological clinical samples from New York, Louisiana, Florida and Illinois and healthy subgingival plaque from a patient in Virginia, USA. The 16S rRNA gene sequence similarity among these isolates was 99.7–100 %, and the closest species with a validly published name was Neisseria lactamica (96.9 % similarity to the type strain). DNA–DNA hybridization confirmed that these isolates are of the same species and are distinct from their nearest phylogenetic neighbour, N. lactamica . Phylogenetic analysis of 16S and 23S rRNA gene sequences indicated that the novel species belongs in the genus Neisseria . The predominant cellular fatty acids were C16 : 0, summed feature 3 (C16 : 1ω7c and/or iso-C15 : 0 2-OH) and C18 : 1ω7c. The cellular fatty acid profile, together with other phenotypic characters, further supports the inclusion of the novel species in the genus Neisseria . The name Neisseria oralis sp. nov. (type strain 6332T  = DSM 25276T  = LMG 26725T) is proposed.

scholarly journals Streptococcus rupicaprae sp. nov., isolated from a Pyrenean chamois (Rupicapra pyrenaica)

2011 ◽  
Vol 61 (8) ◽  
pp. 1989-1993 ◽  
Author(s):  
A. I. Vela ◽  
G. Mentaberre ◽  
I. Marco ◽  
R. Velarde ◽  
S. Lavín ◽  
...  
Keyword(s):  
16S Rrna ◽  
16S Rrna Gene ◽  
Gene Sequence ◽  
Sequence Similarity ◽  
16S Rrna Gene Sequence ◽  
Clinical Samples ◽  
Rrna Gene ◽  
Rrna Gene Sequence ◽  
Biochemical Tests ◽  
Pyrenean Chamois

Biochemical and molecular genetic studies were performed on an unknown Gram-stain-positive, catalase-negative, coccus-shaped organism isolated from clinical samples of a Pyrenean chamois. The micro-organism was identified as a streptococcal species based on its cellular morphological and biochemical tests. 16S rRNA gene sequence comparison studies confirmed its identification as a member of the genus Streptococcus, but the organism did not correspond to any species of this genus. The nearest phylogenetic relative of the unknown coccus from chamois was Streptococcus ovis (95.9 % 16S rRNA gene sequence similarity). The rpoB and sodA sequence analysis showed sequence similarity values of less than 85.7 % and 83.0 %, respectively, with the currently recognized species of the genus Streptococcus. The novel bacterial isolate was distinguished from S. ovis and other species of the genus Streptococcus using biochemical tests. Based on both phenotypic and phylogenetic findings, it is proposed that the unknown bacterium be classified as a novel species of the genus Streptococcus, Streptococcus rupicaprae sp. nov., with the type strain 2777-2-07T ( = CECT 7718T  = CCUG 59652T).

scholarly journals Seven-month kinetics of SARS-CoV-2 antibodies and protective role of pre-existing antibodies to seasonal human coronaviruses on COVID-19

2021 ◽  
Author(s):  
Natalia Ortega ◽  
Marta Ribes ◽  
Marta Vidal ◽  
Rocío Rubio ◽  
Ruth Aguilar ◽  
...  
Keyword(s):  
Protective Role ◽  
Neutralization Capacity ◽  
Care Workers ◽  
Neutralizing Capacity ◽  
Human Coronaviruses ◽  
Antibody Levels ◽  
The Impact ◽  
Kinetics Of ◽  
Over Time

AbstractUnraveling the long-term kinetics of antibodies to SARS-CoV-2 and its determinants, including the impact of pre-existing antibodies to human coronaviruses causing common cold (HCoVs), is essential to understand protective immunity to COVID-19 and devise effective surveillance strategies. IgM, IgA and IgG levels against six SARS-CoV-2 and four HCoV antigens were quantified by Luminex, and antibody neutralization capacity was assessed by flow cytometry, in a cohort of health care workers followed-up for 6 months. Seroprevalence increased over time from 13.5% (month 0) and 15.6% (month 1) to 16.4% (month 6). Levels of antibodies, including those with neutralizing capacity, were stable over time, except IgG to nucleocapsid antigen and IgM levels that waned. After the peak response, anti-spike antibody levels increased from ∼150 days post-symptom onset in all individuals (73% for IgG), in the absence of any evidence of re-exposure. Pre-existing antibodies to alpha-HCoV were lower in individuals who subsequently seroconverted for SARS-CoV-2. IgG and IgA to HCoV were significantly higher in asymptomatic than symptomatic seropositive individuals. Thus, pre-existing cross-reactive HCoVs antibodies could have a protective effect against SARS-CoV-2 infection and COVID-19 disease.

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