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Après de nombreuses années où la présence du circovirus n’était associée qu’à un rôle non pathogène, fin 1990 ou début 1991 selon le continent, le cirvovirose porcine fait une apparition tout aussi brutale que désastreuse chez tous les grands producteurs de porcs mondiaux. 
A ce moment, le virus ne semble toucher que les porcelets en post-sevrage, et la circovirose prend des allures épidémiques partout dans le monde. Le circovirus est alors considéré comme étant le principal agent responsable du syndrome de dépérissement multisystémique du post-sevrage (PMWS), causant de nombreuses pertes et mortalités en porcherie. 
Suite aux forts impacts économiques engendrés par la maladie aux quatre coins du monde, le pathogène se retrouve au centre de nombreuses recherches, aboutissant au bout de quelques années, à la mise en place de nombreuses stratégies de prévention, dont la plus efficace semble être la vaccination. 
Plus tard, sa participation dans d’autres complexes pathologiques sera mise en évidence, touchant différents systèmes du porc, dans toutes catégories d’âge. Cette implication, tout comme dans le PMWS, semble nécessiter l’intervention de facteurs prédisposants, tels que la présence d’autres pathogènes, ou conditions d’élevage favorisantes, avec lesquels il semble interagir et faciliter l’infection via une profonde atteinte du système immunitaire. 
L’utilisation massive et systématisée de vaccin contre le circovirus en élevage, en association avec des bonnes mesures d’élevage et d’hygiène, semblent être les stratégies les plus efficaces dans le contrôle et la réduction des atteintes cliniques dues au PCV2, permettant une nette amélioration de l’économie porcine. Les intervenants de la filière remarquent également une amélioration de la productivité dans les élevages vaccinant contre le circovirus, même lorsque les porcs ne sont pas cliniquement atteints. Ces observations ainsi que la persistance d’une circulation virale active dans la quasi totalité des élevages pourtant sains, laissent penser à la possible existence de maladies subcliniques associées au circovirus, et dont la gestion pourrait s’avérer bien plus complexe.

PCV2 --- PCV --- porcine circovirus --- Sciences du vivant > Médecine vétérinaire & santé animale

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DNA is a rapidly developing vaccine platform for cancer and infectious and non-infectious diseases. Plasmids are used as immunogens to encode proteins to be further synthesized in vaccine recipients. DNA is mainly synthetic, ensuring enhanced expression in the cells of vaccine recipients (mostly mammalians). Their introduction into the host induces antibody and cellular responses. The latter are often more pronounced, and mimic the events occurring in infection, especially viral. There are a few distinct ways in which the vaccine antigen can be processed and presented, which determine the resulting immune response and which can be manipulated. Routinely, the antigen synthesized within the host cell is processed by proteasome, loaded onto, and presented in a complex with MHC I molecules. Processing can be re-routed to the lysosome, or immunogen can be secreted for further presentation in a complex with MHC II. Apart from expression, vaccination efficacy depends on DNA delivery. DNA immunogens are generally administered by intramuscular or intradermal injections, usually followed by electroporation, which enhances delivery 1000-fold. Other techniques are also used, such as noninvasive introduction by biojectors, skin applications with plasters and microneedles/chips, sonication, magnetofection, and even tattooing. An intense debate regarding the pros and cons of different routes of delivery is ongoing. A number of studies have compared the effect of delivery methods at the level of immunogen expression, and the magnitude and specificity of the resulting immune response. According to some, the delivery route determines immunogenic performance; according to others, it can modulate the level of response, but not its specificity or polarity. The progress of research aiming at the optimization of DNA vaccine design, delivery, and immunogenic performance has led to a marked increase in their efficacy in large species and humans. New DNA vaccines for use in the treatment of infectious diseases, cancer, allergies, and autoimmunity are forthcoming. This Special Issue covers various aspects of DNA vaccine development.

Medicine --- Epidemiology & medical statistics --- alphaviruses --- layered RNA/DNA vectors --- DNA vaccines --- RNA replicons --- recombinant particles --- tumor regression --- protection against tumor challenges and infectious agents --- ebola virus disease --- artificial T-cell antigens --- DNA vaccine constructs --- computer design --- gene expression --- immunogenicity --- DNA vaccine --- mRNA vaccine --- plasmid DNA --- in vitro transcribed mRNA --- immune responses --- formulations --- Cytolytic T Lymphocytes --- antibodies --- innate immunity --- adjuvants --- vaccine delivery --- plasmid --- cytolytic --- perforin --- bicistronic --- HCV --- HIV --- IL-36 --- adjuvant --- DNA --- Zika --- Epstein-Barr virus --- latent proteins --- LMP2 --- EBNA1 --- LMP1 --- HIV-1 --- enhancer element --- circovirus --- influenza --- immunization --- intranasal --- lipid --- flagellin --- BCG --- vaccine --- rBCG --- HTI --- T-cell --- AIDS --- clinical trial --- therapeutic vaccine --- hepatitis C virus (HCV) --- mesenchymal stem cells (MSC) --- modified MSC --- DNA immunization --- nonstructural HCV proteins --- immune response --- HCV vaccine --- myeloid derived suppressor cells (MDSCs) --- n/a

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DNA is a rapidly developing vaccine platform for cancer and infectious and non-infectious diseases. Plasmids are used as immunogens to encode proteins to be further synthesized in vaccine recipients. DNA is mainly synthetic, ensuring enhanced expression in the cells of vaccine recipients (mostly mammalians). Their introduction into the host induces antibody and cellular responses. The latter are often more pronounced, and mimic the events occurring in infection, especially viral. There are a few distinct ways in which the vaccine antigen can be processed and presented, which determine the resulting immune response and which can be manipulated. Routinely, the antigen synthesized within the host cell is processed by proteasome, loaded onto, and presented in a complex with MHC I molecules. Processing can be re-routed to the lysosome, or immunogen can be secreted for further presentation in a complex with MHC II. Apart from expression, vaccination efficacy depends on DNA delivery. DNA immunogens are generally administered by intramuscular or intradermal injections, usually followed by electroporation, which enhances delivery 1000-fold. Other techniques are also used, such as noninvasive introduction by biojectors, skin applications with plasters and microneedles/chips, sonication, magnetofection, and even tattooing. An intense debate regarding the pros and cons of different routes of delivery is ongoing. A number of studies have compared the effect of delivery methods at the level of immunogen expression, and the magnitude and specificity of the resulting immune response. According to some, the delivery route determines immunogenic performance; according to others, it can modulate the level of response, but not its specificity or polarity. The progress of research aiming at the optimization of DNA vaccine design, delivery, and immunogenic performance has led to a marked increase in their efficacy in large species and humans. New DNA vaccines for use in the treatment of infectious diseases, cancer, allergies, and autoimmunity are forthcoming. This Special Issue covers various aspects of DNA vaccine development.

Medicine --- Epidemiology & medical statistics --- alphaviruses --- layered RNA/DNA vectors --- DNA vaccines --- RNA replicons --- recombinant particles --- tumor regression --- protection against tumor challenges and infectious agents --- ebola virus disease --- artificial T-cell antigens --- DNA vaccine constructs --- computer design --- gene expression --- immunogenicity --- DNA vaccine --- mRNA vaccine --- plasmid DNA --- in vitro transcribed mRNA --- immune responses --- formulations --- Cytolytic T Lymphocytes --- antibodies --- innate immunity --- adjuvants --- vaccine delivery --- plasmid --- cytolytic --- perforin --- bicistronic --- HCV --- HIV --- IL-36 --- adjuvant --- DNA --- Zika --- Epstein-Barr virus --- latent proteins --- LMP2 --- EBNA1 --- LMP1 --- HIV-1 --- enhancer element --- circovirus --- influenza --- immunization --- intranasal --- lipid --- flagellin --- BCG --- vaccine --- rBCG --- HTI --- T-cell --- AIDS --- clinical trial --- therapeutic vaccine --- hepatitis C virus (HCV) --- mesenchymal stem cells (MSC) --- modified MSC --- DNA immunization --- nonstructural HCV proteins --- immune response --- HCV vaccine --- myeloid derived suppressor cells (MDSCs)

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Antiviral agents are used for the treatment of viral diseases. Antiviral drugs have been successfully developed and used clinically for a limited number of important human viral diseases notably caused by human immunodeficiency virus (HIV), hepatitis C virus (HCV), hepatitis B virus (HBV), herpes, and influenza viruses. Despite the successes of these antiviral drugs, issues with drug resistance and toxicity remain challenging. These challenges are driving research to identify new drug candidates and to investigate novel drug targets to develop new mechanistic drug classes. Antiviral agents are not available against many viruses that cause human disease and economic burdens; in particular, the development of antiviral agents against emerging, re-emerging, and neglected viruses is increasingly becoming a priority. This book includes six review articles that discuss new antiviral strategies. The reviews either discuss advances relating to a specific virus or new therapeutic targets and approaches. The book includes 15 original research articles reporting new antiviral agents against a variety of clinically and economically important viruses and studies into the prevalence or acquisition of drug resistance. Overall, this book is an exciting collection of new research and ideas relating to the development of antiviral agents.

Research & information: general --- Biology, life sciences --- Zika virus --- nucleoside analogues --- antiviral agents --- NS5 --- prodrugs --- ProTides --- neural stem cells --- RNA-dependent RNA polymerase --- cytomegalovirus --- latent infection --- TALEN --- Surveyor nuclease mutation detection assay --- ie-1 gene --- quantitative real-time PCR --- Epstein-Barr virus --- herpes viruses --- lytic gene expression --- Burkitt lymphoma cells --- clozapine --- antipsychotic drug --- antiviral drug --- enteroviruses --- coxsackievirus B4 --- persistent infection --- fluoxetine --- resistance --- mutations --- herpes B virus --- macacine herpesvirus-1 --- genistein --- flavonoids --- acyclovir --- ganciclovir --- Plantago asiatica --- Clerodendrum trichotomum --- RSV --- therapeutic effects --- acteoside --- human antimicrobial peptides --- antiviral strategies --- defensins --- cathelicidins --- hepcidins --- transferrins --- influenza A virus --- brevilin A --- antiviral --- sesquiterpene lactone --- replication --- PRRSV --- polyethylenimine --- PEI --- virion internalization --- endocytosis --- HIV --- pediatrics --- Ethiopia --- pre-treatment drug resistance --- combination antiretroviral therapy (cART) --- dried plasma spots --- dried blood spots --- sphingolipids --- glycosphingolipids --- viruses --- lipid biosynthesis --- flavivirus --- Japanese encephalitis virus --- furin inhibitor --- precursor membrane protein --- measles virus --- central nervous system --- tropism --- treatments --- porcine reproductive and respiratory syndrome virus --- ginsenoside Rg1 --- antiviral activity --- pro-inflammatory factor --- NF-κB signaling pathway --- acute/latent infection --- congenital infection --- antiviral agent --- therapeutic strategies --- nucleic acid-based therapeutic approach --- HCMV vaccine --- adoptive cell therapy --- Rev response element --- chemical footprinting --- SHAPE --- drug discovery --- branched peptides --- herpesvirus --- immediate-early --- IE1 --- IE2 --- ribozyme --- RNA interference --- CRISPR/Cas --- small molecule --- orthohantavirus --- phenyl-benzotriazoles --- C-FRA --- Porcine circovirus type 2 --- epigallocatechin gallate --- heparan sulfate --- antiviral effect --- virus attachment --- microvirin --- lectin --- human immunodeficiency virus --- hepatitis C virus --- antiviral inhibitor --- non-immunogenic --- viral entry --- protein drugs --- LUMS1 --- oleanane-type derivatives --- influenza A virus (IAV) --- virus entry inhibitors --- hemagglutinin (HA)