Search results for "Influenza Virus"

showing 10 items of 29 documents

T cell-mediated cytotoxic immune responsiveness of chimeric mice bearing a thymus graft fully allogeneic to the graft of lymphoid stem cells

1980

Fully allogeneic, chimeric mice were established by adult thymectomy of (A × B) F1animals, grafting parental A-type thymus under the kidney capsula, followed by lethal (900 rd) irradiation and reconstitution with B parental-type bone marrow cells treated with xenogeneic anti-T cell antiserum plus complement. Following in vivo sensitization with inactivated Sendai virus (SV) suspensions, no virus-specific T cells could be detected within the spleen cells of the mice. Upon stimulation with third-party allogeneic cells in a primary mixed lymphocyte culture, spleen cells of all animals generated alloreactive cytotoxic T lymphocytes (CTL). More interestingly, upon secondary in vitro stimulation …

Cytotoxicity ImmunologicT-LymphocytesT cellImmunologySpleenThymus GlandBiologyMiceImmune systemBone MarrowmedicineAnimalsImmunology and AllergyCytotoxic T cellLymphocytesMice Inbred BALB CChimeraMolecular biologyParainfluenza Virus 1 HumanMice Inbred C57BLCTL*medicine.anatomical_structureRadiation ChimeraImmunologyMice Inbred CBALymphoid Progenitor CellsBone marrowStem cellEuropean Journal of Immunology

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Factors associated with influenza vaccination of hospitalized elderly patients in Spain

2016

Vaccination of the elderly is an important factor in limiting the impact of influenza in the com- munity. The aim of this study was to investigate the factors associated with influenza vacci- nation coverage in hospitalized patients aged 65 years hospitalized due to causes unrelated to influenza in Spain. We carried out a cross-sectional study. Bivariate analysis was performed comparing vaccinated and unvaccinated patients, taking in to account sociodemographic variables and medical risk conditions. Multivariate analysis was per- formed using multilevel regression models. We included 1038 patients: 602 (58%) had received the influenza vaccine in the 2013 - 14 season. Three or more general p…

RNA virusesMaleViral Diseaseslcsh:MedicineGlobal HealthPersones gransGeographical LocationsPneumococcal VaccinesElderlyMedicine and Health SciencesPublic and Occupational HealthVacunaciólcsh:SciencePathology and laboratory medicineAged 80 and overVaccinesVaccinationMedical microbiologyVaccination and ImmunizationEuropeInfectious DiseasesStreptococcus pneumoniaeInfluenza A virusInfluenza VaccinesVirusesFemalePathogensAssistència hospitalàriaResearch ArticleImmunologyMicrobiologyInfluenzavirusPatient Education as TopicInfluenza HumanHumansInfluenza virusesEspanyaAgedInpatientsHospital careMarital Statuslcsh:ROrganismsViral pathogensBiology and Life SciencesPneumonia PneumococcalInfluenzaMicrobial pathogensCross-Sectional StudiesSocial ClassAge GroupsSpainPeople and PlacesPopulation Groupingslcsh:QPreventive MedicineOlder peopleOrthomyxoviruses

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Seasonal Human Coronavirus Respiratory Tract Infection in Recipients of Allogeneic Hematopoietic Stem Cell Transplantation

2021

Abstract Background Little is known about characteristics of seasonal human coronaviruses (HCoVs) (NL63, 229E, OC43, and HKU1) after allogeneic stem cell transplantation (allo-HSCT). Methods This was a collaborative Spanish and European bone marrow transplantation retrospective multicenter study, which included allo-HSCT recipients (adults and children) with upper respiratory tract disease (URTD) and/or lower respiratory tract disease (LRTD) caused by seasonal HCoV diagnosed through multiplex polymerase chain reaction assays from January 2012 to January 2019. Results We included 402 allo-HSCT recipients who developed 449 HCoV URTD/LRTD episodes. Median age of recipients was 46 years (range,…

PNEUMONIAMalevirusesmedicine.medical_treatmentseasonal human coronavirusHematopoietic stem cell transplantationmedicine.disease_causeDISEASElaw.inventionCoronavirus OC43 HumanCLINICAL CHARACTERISTICSlawCoronavirus 229E HumanRisk FactorsImmunology and AllergyChildRespiratory Tract InfectionsNL63 INFECTIONSCoronavirusOUTCOMESRespiratory tract infectionsSYNCYTIAL VIRUSHazard ratioHematopoietic Stem Cell Transplantationvirus diseasesupper and lower respiratory tract diseaseHCoV-NL63HCoV-229Erespiratory systemMiddle AgedIntensive care unitHospitalizationimmunocompromisedsurgical procedures operativeInfectious Diseasesmedicine.anatomical_structureAcademicSubjects/MED00290Child PreschoolCohortFemaleSeasonsCoronavirus InfectionsRare cancers Radboud Institute for Health Sciences [Radboudumc 9]allogeneic hematopoietic stem cell transplantation; community-acquired respiratory virus; HCoV-229E; HCoV-HKU1; HCoV-NL63; HCoV-OC43; immunocompromised; immunodeficiency score index; multiplex PCR assay; seasonal human coronavirus; upper and lower respiratory tract diseaseAdultmedicine.medical_specialtyHCoV-OC43AdolescentDIAGNOSISCHINAHCoV-HKU1BetacoronavirusAll institutes and research themes of the Radboud University Medical Centerstomatognathic systemInternal medicinemedicineMajor ArticleRHINOVIRUSHumansallogeneic hematopoietic stem cell transplantationAgedRetrospective Studiescommunity-acquired respiratory virusbusiness.industryInfantmultiplex PCR assayTransplantationCoronavirus NL63 HumanPARAINFLUENZA VIRUSbusinessimmunodeficiency score indexRespiratory tract

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H-2-linked murine cytotoxic T cell responses specific for sendai virus-infected cells

1978

CBA (H-2k) mouse-derived lymphochoriomeningitis virus and herpes simplex virus-specific cytotoxic T lymphocytes lyse virus-infected target cells compatible on either the H-2k or H-2D region. In contrast, CBA, C3H and AKR (H-2k) mouse-derived sendai virus-specific cytotoxic T lymphocytes (CTL) fail to lyse H-2D-compatible virus-infected cells. A similar lack of H-2D region-associated lytic activity was found with C57BL/6 and C57BL/10 (H-2b) mice as well as with the recombinants B10.A (2R) [Kb-Db] and B10.A (4R) [Kk-Db]. On the other hand, BALB/c (H-2d) mice and A/J (H-2a) mice do generate H-2Dd-associated sendai virus-specific CTL. These results are in contrast to those obtained with (CBA X …

Cytotoxicity ImmunologicGenotypeT-LymphocytesvirusesImmunologychemical and pharmacologic phenomenaVirusMajor Histocompatibility ComplexEpitopesMiceGenotypeAnimalsLymphocytic choriomeningitis virusSimplexvirusImmunology and AllergyCytotoxic T cellGeneMice Inbred BALB CParamyxoviridae InfectionsbiologyHerpes Simplexbiology.organism_classificationVirologySendai virusParainfluenza Virus 1 HumanMice Inbred C57BLCTL*RickettsiaLytic cycleMice Inbred CBAEuropean Journal of Immunology

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Comparison of the BD Directigen Flu A+B Kit and the Abbott TestPack RSV with a multiplex RT-PCR ELISA for rapid detection of influenza viruses and re…

2005

ABSTRACTThe Directigen Flu A+B enzyme immunoassay and the Abbott TestPack RSV enzyme immunoassay were each compared with a multiplex RT-PCR ELISA by testing 635 nasopharyngeal aspirates collected from children aged < 16 years who had been hospitalised with acute respiratory tract infection during the epidemic season 2002–2003. In this study, the sensitivity of the Directigen Flu A+B assay was unacceptably low (29.3% and 10.0%, respectively) for the detection of influenza A and B viruses. The sensitivity of the Abbott TestPack RSV assay (77.4%) was acceptable and in agreement with the multiplex RT-PCR ELISA.

Microbiology (medical)Paramyxoviridaerespiratory syncytial virusrespiratory tract infectionEnzyme-Linked Immunosorbent AssayPolymerase Chain ReactionSensitivity and Specificityinfluenza virusVirusAssaysMicrobiologyPneumovirinaeNasopharynxMultiplex polymerase chain reactionmedicineMultiplexProspective StudiesMononegaviralesbiologymedicine.diagnostic_testReverse Transcriptase Polymerase Chain Reactionvirus diseasesGeneral Medicinebiology.organism_classificationenzyme immunoassayVirologyInfluenza B virusInfectious Diseasesmultiplex RT-PCRInfluenza A virusRespiratory Syncytial Virus HumanImmunoassayReagent Kits DiagnosticViral diseaseClinical Microbiology and Infection

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Traditional Chinese herbal medicine at the forefront battle against COVID-19: Clinical experience and scientific basis.

2020

Abstract Background Throughout the 5000-year history of China, more than 300 epidemics were recorded. Traditional Chinese herbal medicine (TCM) has been used effectively to combat each of these epidemics’ infections, and saved many lives. To date, there are hundreds of herbal TCM formulae developed for the purpose of prevention and treatment during epidemic infections. When COVID-19 ravaged the Wuhan district in China in early January 2020, without a deep understanding about the nature of COVID-19, patients admitted to the TCM Hospital in Wuhan were immediately treated with TCM and reported later with >90% efficacy. Approach We conducted conduct a systematic survey of various TCM herbal pre…

PTGS2 Prostaglandin-endoperoxide synthase 2BattleAIV avian influenza virusCoV coronavirusPharmaceutical ScienceiNOS nitric oxide synthaseViral infection0302 clinical medicinePA patchouli alcoholSARS Severe Acute Respiratory SyndromeSMD Sheganmahuang decoctionDrug DiscoveryPandemicIL InterleukinMedicine Chinese TraditionalALI acute lung injuriesmedia_commonCOVID-19 coronavirus disease 2019MXSG Ma xing shi gan decoction0303 health sciencesTNF tumor necrosis factorClinical Trials as TopicCCL2 CC chemokine ligand 2FM1 FM1 coronavirusICU intensive care unitc-AMP cyclic adenosine phosphateHIV human immunodeficiency virus030220 oncology & carcinogenesisCOX-2 cyclooxygenase-2Molecular MedicineHerbal preparationsMedicinal herbsAbbreviations: ACE2 angiotensin-converting enzyme IITCM traditional Chinese medicineHSV-1 herpes simplex virus 1CASP3 caspase 3medicine.medical_specialtyChinaCoronavirus disease 2019 (COVID-19)Systematic surveymedia_common.quotation_subjectJEV Japanese encephalitis virusNF-κB nuclear factor kappa B cellsAntiviral AgentsArticleWHO World Health Organization03 medical and health sciencesIEC-6 rat intestinal epithelial cell line 6SOD superoxide dismutaseCDC Center for Disease Control and PreventionmedicineAVP arginine vasopressinPGE2 prostaglandin E2HumansIntensive care medicineLH Lianhuaqingwen capsule030304 developmental biologyPharmacologyMedicinal herbMDA malondialdehydeGCGJ Gancao ganjiang decoctionNO nitric oxidePlants Medicinalbusiness.industrySARS-CoV-2COVID-19CXCL C-X-C- motif chemokineMDCK Madin-Darby Canine Kidney cellsTLR-4 Toll-like receptor-4COVID-19 Drug TreatmentComplementary and alternative medicineViral infectionLPS lipopolysaccharidesRSV respiratory syncytial virusQFPD Qingfeipaidu decoctionbusinessLung congestionECMO extracorporeal membrane oxygenationMAPK mitogen-activated protein kinasePhytotherapyDrugs Chinese HerbalPhytomedicine : international journal of phytotherapy and phytopharmacology

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Direct Visualization of the Conformational Dynamics of Single Influenza Hemagglutinin Trimers

2018

Influenza hemagglutinin (HA) is the canonical type I viral envelope glycoprotein and provides a template for the membrane-fusion mechanisms of numerous viruses. The current model of HA-mediated membrane fusion describes a static "spring-loaded" fusion domain (HA2) at neutral pH. Acidic pH triggers a singular irreversible conformational rearrangement in HA2 that fuses viral and cellular membranes. Here, using single-molecule Förster resonance energy transfer (smFRET)-imaging, we directly visualized pH-triggered conformational changes of HA trimers on the viral surface. Our analyses reveal reversible exchange between the pre-fusion and two intermediate conformations of HA2. Acidification of p…

0301 basic medicineProtein ConformationHemagglutinin (influenza)Hemagglutinin Glycoproteins Influenza VirusBiologyArticleGeneral Biochemistry Genetics and Molecular BiologyReaction coordinate03 medical and health sciencesViral envelopeInfluenza HumanFluorescence Resonance Energy TransferHumansDynamic equilibriumFusionCell MembraneLipid bilayer fusionHydrogen-Ion ConcentrationVirus InternalizationSingle Molecule ImagingHEK293 CellsHemagglutinins030104 developmental biologyMembraneFörster resonance energy transferA549 CellsInfluenza A virusBiophysicsbiology.proteinProtein BindingCell

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Human CD8(+) T Cells Damage Noninfected Epithelial Cells during Influenza Virus Infection In Vitro

2017

During severe influenza A virus (IAV) infections, a large amount of damage to the pulmonary epithelium is the result of the antiviral immune response. Specifically, whilst CD8+ T cells are important for killing IAV-infected cells, during a severe IAV infection, they can damage uninfected epithelial cells. At present, the mechanisms by which this occurs are unclear. Here, we used a novel in vitro coculture model of human NCl-H441 cells and CD8+ T cells to provide a new insight into how CD8+ T cells may affect uninfected epithelial cells during severe IAV infections. Using this model, we show that human IAV-specific CD8+ T cells produce soluble factors that reduce the barrier integrity of non…

0301 basic medicinePulmonary and Respiratory MedicineEpithelial sodium channelCD8(+) T cellsClinical BiochemistryCell BiologyLung injuryBiologyVirologyinfluenza virusepithelial cellsbystander damage03 medical and health sciencesInterleukin 21030104 developmental biology0302 clinical medicineImmune systemBystander effectCytotoxic T cellTumor necrosis factor alphaMolecular BiologyCD8030215 immunologyAmerican Journal of Respiratory Cell and Molecular Biology

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Shared determinants between virus-infected and trinitrophenyl-conjugated H-2-identical target cells detected in cell-mediated lympholysis

1976

Infection of H-2-identical mice with either lymphocytic choriomeningitis (LCM) virus, vaccinia virus, or paramyxo (Sendai) virus resulted in the generation of specifically sensitized cytotoxic T lymphocytes (CTL). CTL generated in vitro against 2,4,6-trinitrophenyl (TNP)-conjugated syngeneic stimulator cells were specifically cytotoxic for TNP-conjugated H-2K (D) region identical targets. Both LCM and vaccinia-induced CTL, however, were found to be strongly cytotoxic towards TNP-conjugated, H-2K(D) region-identical target cells. In contrast, Sendai virus-induced CTL did not lyse TNP-conjugated, syngeneic target cells. Inhibition experiments using cold targets suggested that shared antigenic…

T-LymphocytesvirusesImmunologyMice Inbred StrainsVaccinia viruschemical and pharmacologic phenomenaCross ReactionsBiologyLymphocytic choriomeningitisVirusEpitopeEpitopesMicechemistry.chemical_compoundAntigenHistocompatibility AntigensmedicineAnimalsLymphocytic choriomeningitis virusImmunology and AllergyCytotoxic T cellCells CulturedNitrobenzeneshemic and immune systemsCytotoxicity Tests Immunologicmedicine.diseaseVirologyIn vitroParainfluenza Virus 1 HumanCold TemperatureCTL*chemistryTrinitrobenzenesVacciniaEuropean Journal of Immunology

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Sociodemographic Factors and Clinical Conditions Associated to Hospitalization in Influenza A (H1N1) 2009 Virus Infected Patients in Spain, 2009–2010

2012

The emergence and pandemic spread of a new strain of influenza A (H1N1) virus in 2009 resulted in a serious alarm in clinical and public health services all over the world. One distinguishing feature of this new influenza pandemic was the different profile of hospitalized patients compared to those from traditional seasonal influenza infections. Our goal was to analyze sociodemographic and clinical factors associated to hospitalization following infection by influenza A(H1N1) virus. We report the results of a Spanish nationwide study with laboratory confirmed infection by the new pandemic virus in a case-control design based on hospitalized patients. The main risk factors for hospitalizatio…

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