Download or read book Studies on the Interaction Between Porcine Circovirus Type 2 and the Porcine Immune System written by D. F. Gilpin and published by . This book was released on 2003 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Interaction Between Porcine Circovirus Type 2 and the Immune System of the Pig written by Frida Hasslung Wikström and published by . This book was released on 2008 with total page 76 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Polymicrobial Diseases written by Kim A. Brogden and published by . This book was released on 2002 with total page 460 pages. Available in PDF, EPUB and Kindle. Book excerpt: Polymicrobial diseases, those involving more than one etiologic agent, are more common than is generally realized and include respiratory diseases, gastroenteritis, conjunctivitis, keratitis, hepatitis, periodontal diseases, multiple sclerosis, genital infections, intra -- abdominal infections, and pertussis.

Download or read book Porcine Circovirus Type 2 written by Esther Steiner and published by . This book was released on 2008 with total page 105 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Effect of Porcine Circovirus Type 2 on Porcine Cell Populations written by Shan Yu and published by . This book was released on 2006 with total page 296 pages. Available in PDF, EPUB and Kindle. Book excerpt: Porcine circovirus type 2 (PCV2) is an important pathogen of swine and is associated with post weaning multisystemic wasting syndrome which is characterized by follicular and interfollicular lymphoid depletion and a concurrent macrophage infiltration of lymphoid tissues. The mechanism of the lymphocyte depletion in PCV2 infected pigs and the specific immune cell populations in which PCV2 replicates remains unknown. The objectives of these studies were to evaluate PCV2 replication in specific immune cell populations in vitro and in vivo, and investigate the effects of PCV2 infection and replication on activated immune cells in vitro. We demonstrated that mitogen stimulation/activation increases virus replication in peripheral blood mononuclear cells (PBMCs) in vitro and the virus replication level was higher with pokeweed mitogen (PWM) stimulation compared to concanavalin A (ConA) stimulation. PCV2 replicates in T and B lymphocytes, which appear to be the primary cells that support virus replication while monocytes appear to be a site for PCV2 persistence in the infected host. We found that PCV2 replicates in most tissues except thymus and lymphoid tissues near the site of infection play an important role in PCV2 replication and persistence. Our investigation of the effect of PCV2 infection and replication on activated porcine PBMCs in vitro demonstrated that PCV2 infection does not impair the ability of PBMCs to proliferate in response to ConA/PWM stimulation. Increased apoptosis was associated with PCV2 infection in the presence of PWM, but not ConA, indicating that PCV2 induced apoptosis requires a specific stimulation/trigger. In the presence of PCV2 alone, apoptosis was decreased suggesting that PCV2 may persist in immune cells by inhibiting apoptosis. The relationship between virus replication and cellular proliferation was investigated and no significant differences were observed between the levels of PCV2 replication product, spliced capsid mRNA, in PBMCs stimulated at various times prior to PCV2 infection or between proliferating and non-proliferating PBMCs with ConA/PWM stimulation. These findings suggest that PCV2 replication requires a specific stimulation/trigger and is not dependent just on cell division/proliferation. These studies provide important information on understanding the pathogenesis of PCV2-induced diseases.

Download or read book Characterization of the Antibody Response to Vaccination and Or Infection with Porcine Circovirus Type 2 and Identification and Characterization of a Decoy Epitope in the Capsid Protein written by Benjamin Ralph Trible and published by . This book was released on 2021 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Chapter 1: Porcine circovirus-associated disease (PCVAD) encompasses a group of complex, multi-factorial syndromes, which are dependent on infection with porcine circovirus type 2 (PCV2). Current strains of PCV2 circulating in the field are phylogenically classified into two groups, termed PCV2a and 2b. Outbreaks of severe PCVAD in North America in 2005 are linked with a shift in the predominant circulating genotype, from PCV2a to PCV2b. Therefore genotype specific differences in pathogenesis and antigenicity have been suggested. Overall, evidence suggests pathogenicity is a function of the specific PCV2 isolate, regardless of genotype. In addition, only minor antigenic differences have been reported. In terms of immunopathogenisis, a genotypically conserved immune decoy epitope, located in the C-terminal region of the capsid protein, provides an explanation for the inability to identify pathogenic differences between genotypes. Finally, genetic variation of PCV2 and the resulting consequences with respect to vaccination and diagnostics is discussed. Chapter 2: Open reading frame 2 (ORF2) of porcine circovirus type 2 (PCV2) codes for the 233 amino acid capsid protein (CP). Baculovirus-based vaccines that express only ORF2 are protective against clinical disease following experimental challenge or natural infection. The goal of this study was to identify regions in CP preferentially recognized by sera from experimentally infected and vaccinated pigs, and compare these responses to pigs diagnosed with porcine circovirus-associated disease (PCVAD), including porcine multi-systemic wasting syndrome (PMWS) and porcine dermatitis and nephropathy syndrome (PDNS). The approach was to react porcine sera with CP polypeptide fragments followed by finer mapping studies using overlapping oligopeptides that covered amino acids 141-200. The results showed that vaccinated pigs preferentially recognized only the largest CP(43-233) polypeptide fragment. A subset of experimentally infected pigs and pigs with PDNS showed strong reactivity against a CP oligopeptide, 169-STIDYFQPNNKR-180. Alanine scanning identified Y-173, F-174, Q-175 and K-179 as important for antibody recognition. The results from this study support the notion of PCV2 modulation of immunity, including antibody responses that may represent a precursor for disease. The recognition of CP(169-180) and other polypeptides provide opportunities to devise diagnostic tests for monitoring the immunological effectiveness of vaccination. Chapter 3: Porcine circovirus associated disease (PCVAD) encompasses a group of syndromes linked to infection with porcine circovirus type 2 (PCV2). Based on the hypothesis that the immune response to vaccination versus infection are quantitatively and qualitatively different, the objective of this study was to evaluate immunity, virus replication and disease protection in pigs vaccinated with PCV2 capsid protein (CP) and natural infection. The disease model included dual infection with PCV2 and porcine reproductive and respiratory syndrome virus (PRRSV), a factor known to enhance disease progression and severity. The principal effect of PRRSV infection was to increase peak PCV2 viremia by almost 40-fold; however, PCV2 failed to show a reciprocal effect on PRRSV. In vaccinated pigs, there was no evidence of disease or PCV2 replication following dual virus challenge. Immunity following vaccination favored neutralizing antibody; whereas, PCV2 infection produced high levels of non-neutralizing antibody, primarily directed against a polypeptide in the C-terminal region of CP. These results support the notion that the magnitude of the total antibody response cannot be used as a measure of protective immunity. Furthermore, protection versus disease lies in the immunodominance of specific epitopes. Epitope specificity should be taken into consideration when designing PCV2 vaccines. Chapter 4: Porcine circovirus type 2 (PCV2) capsid protein (CP) is the only protein necessary for the formation of the virion capsid and recombinant CP spontaneously forms virus-like particles (VLPs). Located within a single CP subunit is an immunodominant epitope, CP(169-180), which is exposed on the surface of the subunit; but, in the structural context of the VLP, the epitope is buried and inaccessible to antibody. High levels of anti-CP(169-180) activity are associated with porcine circovirus-associated disease (PCVAD). The purpose of this study was to investigate the role of the immune response to monomer CP in the development of PCVAD. The approach was to immunize pigs with CP monomer followed by challenge with PCV2 and porcine reproductive and respiratory syndrome virus (PRRSV). To maintain the CP immunogen as a stable monomer, CP(43-233) was fused to ubiquitin (Ub-CP). Size exclusion chromatography showed that Ub-CP was present as a single 33 kDa protein. Pigs immunized with Ub-CP developed a strong antibody response to PCV2, including antibodies against CP(169-180). However, only low levels of virus neutralizing activity were detected and viremia was similar to non-immunized pigs. As a positive control, immunization with baculovirus-expressed CP (Bac-CP) resulted in high levels of virus neutralizing activity, low amounts of anti-CP(169-180) activity, and the absence of viremia in pigs following virus challenge. The data support the role of CP(169-180) as an immunological decoy and illustrate the importance of the structural form of the CP immunogen in determining the outcome following infection.

Download or read book Veterinary Vaccines written by R. Pandey and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 354 pages. Available in PDF, EPUB and Kindle. Book excerpt: Vaccines have historically been considered to be the most cost-effective method for preventing communicable diseases. It was a vaccine that enabled global eradication of the dreaded disease smallpox. Mass immunization of children forms the anchor of the strategy of the World Health Organization (WHO) to attain "health for all" status by the year 2000. Vaccinology is undergoing a dimensional change with the advances that have taken place in immunology and genetic engineering. Vaccines that confer short or inadequate immunity or that have side effects are being replaced by better vaccines. New vaccines are being developed for a variety of maladies. Monoclonal antibodies and T cell clones have been employed to delineate the immunodeterminants on microbes, an approach elegantly complemented by computer graphics and molecular imaging techniques. Possibilities have opened for obtaining hitherto scarce antigens of parasites by the DNA recombinant route. Better appreciation of the idiotypic network has aroused research on anti idiotypic vaccines. Solid-phase synthesis of peptides is leading to an array of synthetic vaccines, an approach that is expected to attain its full potential once the sequences activating suppressor cells are discovered and the rules for presentation of antigens to T and B cells are better worked out. A new breed of vaccines is on the horizon that seeks to control fertility. Originally conceived to intercept a step in the reproductive process, they are conceptual models for developing approaches to regulate the body's internal processes.

Download or read book Mycoplasmas in Swine written by Dominiek Maes and published by CABI. This book was released on 2021-03-12 with total page 346 pages. Available in PDF, EPUB and Kindle. Book excerpt: Swine can be infected with many different mycoplasmas. Some are important pathogens, causing significant health and welfare issues in pigs and major losses to the swine industry worldwide. Other mycoplasmas are not pathogenic for swine and can be considered commensals. This book provides up-to-date scientific, clinical and practical information of the most important pathogenic mycoplasmas in swine. Most emphasis has been placed on Mycoplasma hyopneumoniae as the most economically important, but other pathogenic species like Mycoplasma hyorhinis, Mycoplasma hyosynoviae and Mycoplasma suis are also discussed. Written by internationally renowned scientists and clinicians from all over the world, this book draws together in depth knowledge, expertise and experience in swine mycoplasmas to provide an evidence-based, academically rigorous and practical collection. It aims to serve the scientific and veterinary community and the swine industry worldwide.

Download or read book Interactions of Porcine Circovirus Type 2 and Porcine Reproductive and Respiratory Syndrome Virus written by Avanti Sinha and published by . This book was released on 2011 with total page 215 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book It Ain t Necessarily So written by Richard Lewontin and published by New York Review of Books. This book was released on 2001-09-30 with total page 404 pages. Available in PDF, EPUB and Kindle. Book excerpt: Is our nature—as individuals, as a species—determined by our evolution and encoded in our genes? If we unravel the protein sequences of our DNA, will we gain the power to cure all of our physiological and psychological afflictions and even to solve the problems of our society? Today biologists—especially geneticists—are proposing answers to questions that have long been asked by philosophy or faith or the social sciences. Their work carries the weight of scientific authority and attracts widespread public attention, but it is often based on what the renowned evolutionary biologist Richard Lewontin identifies as a highly reductive misconception: "the pervasive error that confuses the genetic state of an organism with its total physical and psychic nature as a human being." In these nine essays covering the history of modern biology from Darwin to Dolly the sheep, all of which were originally published in The New York Review of Books, Lewontin combines sharp criticisms of overreaching scientific claims with lucid expositions of the exact state of current scientific knowledge—not only what we do know, but what we don't and maybe won't anytime soon. Among the subjects he discusses are heredity and natural selection, evolutionary psychology and altruism, nineteenth-century naturalist novels, sex surveys, cloning, and the Human Genome Project. In each case he casts an ever-vigilant and deflationary eye on the temptation to look to biology for explanations of everything we want to know about our physical, mental, and social lives. These essays—several of them updated with epilogues that take account of scientific developments since they were first written—are an indispensable guide to the most controversial issues in the life sciences today. The second edition of this collection includes new essays on genetically modified food and the completion of the Human Genome Project. It is an indispensable guide to the most controversial issues in the life sciences today.

Download or read book Aquaculture Virology written by Frederick S.B. Kibenge and published by Elsevier. This book was released on 2024-07-16 with total page 745 pages. Available in PDF, EPUB and Kindle. Book excerpt: Aquaculture Virology, Second Edition covers all the known virus families, and specific diseases that affect each aquatic organism. Descriptions of each disease includes disease name, structure and composition of virus, classification and virus replication, epidemiology, pathology and immunity, diagnostic methods (gross pathology, histopathology, cell culture, PCR, sequencing, ELISA, etc.) and prevention and control. This is an excellent reference of updated foundational and practical knowledge from experts in both academia and research.Those interested in fish viral diseases will find the book an excellent source for high quality illustrations of viral structure, diagrams of pathogenesis of diseases, and many images of gross pathology and histopathology lesions, using the same format in all chapters to facilitate the reading and studying. This second edition of the book will cover all virus families and the specific diseases relevant to aquaculture with current information delivered in a systematic and succinct way to the researcher, teacher, student, diagnostic laboratory staff, clinical veterinarian, aquaculture disease practitioner, farmer, and all people that are interested in viruses in general. - Provides unique, comprehensive information on animal pathogens and viruses found in aquaculture and fisheries - Presents high-quality illustrations of viral structure, diagrams of viral disease processes, gross pathology, and histopathology lesions to aid in understanding - Incorporates all updated changes in taxonomy since the first edition - Includes a new chapter on the impact of climate change on the manifestations of different aquatic animal viral diseases - Describes aquatic viruses of the major aquatic animals, fish, crustaceans, and mollusks

Download or read book Jubb Kennedy Palmer s Pathology of Domestic Animals Volume 2 written by Grant Maxie and published by Elsevier Health Sciences. This book was released on 2015-08-14 with total page 1219 pages. Available in PDF, EPUB and Kindle. Book excerpt: With an emphasis on the disease conditions of dogs, cats, horses, swine, cattle and small ruminants, Jubb, Kennedy, and Palmer's Pathology of Domestic Animals, 6th Edition continues its long tradition of being the most comprehensive reference book on common domestic mammal pathology. Using a body systems approach, veterinary pathology experts provide overviews of general system characteristics, reactions to insult, and disease conditions that are broken down by type of infectious or toxic insult affecting the anatomical subdivisions of each body system. The sixth edition now boasts a new full-color design, including more than 2,000 high-resolution images of normal and abnormal organs, tissues, and cells. Updated content also includes evolved coverage of disease agents such as the Schmallenberg virus, porcine epidemic diarrhea virus, and the porcine deltacoronavirus; plus new information on molecular-based testing, including polymerase chain reaction (PCR) and in-situ hybridization, keep you abreast of the latest diagnostic capabilities. - Updated content includes new and evolving pathogens and diagnostic techniques. - Updated bibliographies give readers new entry points into the rapidly expanding literature on each subject. - NEW! High-resolution color images clearly depict the diagnostic features of hundreds of conditions. - NEW! Introduction to the Diagnostic Process chapter illustrates the whole animal perspective and details the approaches to systemic, multi-system, and polymicrobial disease. - NEW! Coverage of camelids is now included in the reference's widened scope of species. - NEW! Team of 30+ expert contributors offers the latest perspective on the continuum of issues in veterinary pathology. - NEW! Expanded resources on the companion website include a variety of helpful tools such as full reference lists with entries linked to abstracts in Pub Med and bonus web-only figures. - NEW! Full-color design improves the accessibility of the text.

Download or read book Porcine Viruses written by Hovakim Zakaryan and published by . This book was released on 2019 with total page 208 pages. Available in PDF, EPUB and Kindle. Book excerpt: A comprehensive review of the current knowledge written by prominent scientists.

Download or read book Diseases of Swine written by Jeffrey J. Zimmerman and published by John Wiley & Sons. This book was released on 2019-06-18 with total page 1136 pages. Available in PDF, EPUB and Kindle. Book excerpt: Provides a fully revised Eleventh Edition of the definitive reference to swine health and disease Diseases of Swine has been the definitive reference on swine health and disease for over 60 years. This new edition has been completely revised to include the latest information, developments, and research in the field. Now with full color images throughout, this comprehensive and authoritative resource has been redesigned for improved consistency and readability, with a reorganized format for more intuitive access to information. Diseases of Swine covers a wide range of essential topics on swine production, health, and management, with contributions from more than 100 of the foremost international experts in the field. This revised edition makes the information easy to find and includes expanded information on welfare and behavior. A key reference for anyone involved in the swine industry, Diseases of Swine, Eleventh Edition: Presents a thorough revision to the gold-standard reference on pig health and disease Features full color images throughout the book Includes information on the most current advances in the field Provides comprehensive information on swine welfare and behavior Offers a reorganized format to make the information more accessible Written for veterinarians, academicians, students, and individuals and agencies responsible for swine health and public health, Diseases of Swine, Eleventh Edition is an essential guide to swine health. "The 11th edition of Diseases of Swine continues to serve as the gold-standard resource for anything and everything related to swine herd health...this edition does an outstanding job of keeping up with the advanced diagnostic technologies and the latest research on new or emerging diseases and syndromes...there is no other informational resource that comes close to providing the depth or quality of information on the topic of swine diseases as does this book"

Download or read book Swine Respiratory Disease written by Paolo Martelli and published by Grupo Asís Biomedia S.L.. This book was released on 2021-08-24T00:00:00+02:00 with total page 148 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book aims to provide an updated overview on the most common pathogens responsible for porcine respiratory disease complex. The authors, all renowned and award-winning experts with a wide experience in respiratory diseases in pigs, have focused their efforts on gathering the latest information and data available on the topics covered while making the book as readable as possible.

Download or read book Emerging Swine Viruses written by Zhenhai Chen and published by Frontiers Media SA. This book was released on 2020-05-13 with total page 134 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Virus Infections of Ruminants written by Z. Dinter and published by Elsevier. This book was released on 1990 with total page 593 pages. Available in PDF, EPUB and Kindle. Book excerpt: Hardbound. As its title suggests, this book is intended to give exhaustive information on virus infections and diseases occurring in ruminants. Each virus and corresponding disease is described in a separate chapter, and the chapters are ordered according to current virus classification. Contributing authors are experts on the virus and disease they describe. Where necessary, the text is accompanied by tables and pictures. The accent is placed on diagnosis of the disease by clinical observations including epizootological data. There is also a description of the laboratory procedures of diagnostic virology, and suggestions concerning control measures (e.g. vaccination and/or eradication policy).This book should prove indispensable to: the practising veterinarian, by facilitating recognition of a viral disease, and giving advice on collecting appropriate specimens for laboratory investigation; the veterinary virologist by aiding the choice of appropriate