|
Avian Infectious Bronchitis Virus
''Avian coronavirus'' is a species of virus from the genus ''Gammacoronavirus'' that infects birds; since 2018, all gammacoronaviruses which infect birds have been classified as this single species. The strain of avian coronavirus previously known as infectious bronchitis virus (IBV) is the only coronavirus that infects chickens. It causes avian infectious bronchitis, a highly infectious disease that affects the respiratory tract, gut, kidney and reproductive system. IBV affects the performance of both meat-producing and egg-producing chickens and is responsible for substantial economic loss within the poultry industry. The strain of avian coronavirus previously classified as Turkey coronavirus causes gastrointestinal disease in turkeys. Classification IBV is in the genus ''Gammacoronavirus'', or group 3, with a non-segmented, positive-sense single-stranded RNA genome. It was previously the type species of its genus '' Igacovirus''. When there was only one genus of coronavi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Gammacoronavirus
''Gammacoronavirus'' (Gamma-CoV) is one of the four genera (''Alpha''-, '' Beta-'', ''Gamma-'', and '' Delta-'') of coronaviruses. It is in the subfamily ''Orthocoronavirinae'' of the family ''Coronaviridae''. They are enveloped, positive-sense, single-stranded RNA viruses of zoonotic origin. Coronaviruses infect both animals and humans. While the alpha and beta genera are derived from the bat gene pool, the gamma and delta genera are derived from the avian and pig gene pools. Gamma-CoV also known as coronavirus group 3 are the avian coronaviruses. See also *Animal viruses * Positive/negative-sense *RNA virus An RNA virus is a virusother than a retrovirusthat has ribonucleic acid (RNA) as its genetic material. The nucleic acid is usually single-stranded RNA ( ssRNA) but it may be double-stranded (dsRNA). Notable human diseases caused by RNA viruses ... References External links CoronavirusesVirus Pathogen Database and Analysis Resource (ViPR): Coronaviridae {{Taxon ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Mycoplasma Gallisepticum
''Mycoplasma gallisepticum'' (MG) is a bacterium belonging to the class Mollicutes and the family Mycoplasmataceae. It is the causative agent of chronic respiratory disease (CRD) in chickens and infectious sinusitis in turkeys, chickens, game birds, pigeons, and passerine birds of all ages.Mercia, Leonard (2001). ''Storey's Guide to Raising Poultry''. 1. North Adams, MA: Storey Publishing. pp. 272–73. Mycoplasmosis is the disease caused by infection with mycoplasmas. Mycoplasmas have many defining characteristics. Mycoplasma lack cell walls, have highly variable surface proteins and a distinctive plasma membrane, and are the smallest self-replicating prokaryotes. Mycoplasma can cause disease in humans, animals, insects, and plants.U.S. Geological Survey SGS (1999). ''Field Manual of Wildlife Diseases: General Field Procedures and Disease of Birds''. Biological Resources Division Information and Technology Report 1999–2001. Mycoplasma attach to host epithelial cells, such as i ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Animal Viral Diseases
Animals are multicellular, eukaryotic organisms in the biological kingdom Animalia. With few exceptions, animals consume organic material, breathe oxygen, are able to move, can reproduce sexually, and go through an ontogenetic stage in which their body consists of a hollow sphere of cells, the blastula, during embryonic development. Over 1.5 million living animal species have been described—of which around 1 million are insects—but it has been estimated there are over 7 million animal species in total. Animals range in length from to . They have complex interactions with each other and their environments, forming intricate food webs. The scientific study of animals is known as zoology. Most living animal species are in Bilateria, a clade whose members have a bilaterally symmetric body plan. The Bilateria include the protostomes, containing animals such as nematodes, arthropods, flatworms, annelids and molluscs, and the deuterostomes, containing the echinoderms an ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Poultry Diseases
Poultry diseases occur in poultry, which are domesticated birds kept for their meat, eggs or feathers. Poultry species include the chicken, turkey, duck, goose and ostrich. Viral diseases * Avian infectious bronchitis, caused by a strain of Avian coronavirus previously known as infectious bronchitis virus * Avian infectious laryngotracheitis, caused by Gallid alphaherpesvirus 1 * Avian influenza, caused by Avian influenza virus * Duck plague, caused by Anatid alphaherpesvirus 1 * Chicken infectious anemia, caused by Chicken anaemia virus * Epidemic tremor, caused by Tremovirus * Fowlpox, caused by viruses in the genus ''Avipoxvirus'' * Infectious bursal disease (IBD), also known Gumboro disease, caused by Infectious bursal disease virus * Lymphoid leukosis caused by avian sarcoma leukosis virus * Marek's disease * Newcastle disease * Viral arthritis, caused by Avian reovirus Parasitic diseases * Scaly leg, caused by the mite ''Knemidocoptes mutans'' * Infestation by ''Der ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Veterinary Virology
Veterinary virology is the study of viruses in non-human animals. It is an important branch of veterinary medicine. Rhabdoviruses Rhabdoviruses are a diverse family of single stranded, negative sense RNA viruses that infect a wide range of hosts, from plants and insects, to fish and mammals. The ''Rhaboviridae'' family consists of six genera, two of which, cytorhabdoviruses and nucleorhabdoviruses, only infect plants. Novirhabdoviruses infect fish, and vesiculovirus, lyssavirus and ephemerovirus infect mammals, fish and invertebrates. The family includes pathogens such as rabies virus, vesicular stomatitis virus and potato yellow dwarf virus that are of public health, veterinary, and agricultural significance. Foot-and-mouth disease virus Foot-and-mouth disease virus (FMDV) is a member of the Aphthovirus genus in the Picornaviridae family and is the cause of foot-and-mouth disease in pigs, cattle, sheep and goats. It is a non-enveloped, positive strand, RNA virus. FMDV is a ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Infectious Bronchitis Virus D-RNA
The Infectious bronchitis virus D-RNA is an RNA element known as defective RNA or D-RNA. This element is thought to be essential for viral replication and efficient packaging of avian infectious bronchitis virus (IBV) particles. Coronavirus D-RNA like that of IBV, are produced during high multiplicity of infection and contain ''cis-''acting sequences which are required for viral replication. While it is unclear exactly how IBV D-RNA is made, it is thought to be synthesized in a similar manner as subgenomic mRNA (sg mRNA), with most of the genomic sequence left out of the product. Additionally, sg mRNA can also be synthesized from the IBV D-RNA, although the mechanism of that process is still largely unknown. IBV D-RNA is often used in the reverse genetics approach to experimentally induce heterologous gene expression and site-specific mutagenesis of the coronavirus genome. However, a translation associated sequence (TAS), which is normally used to transcribe sg mRNA and is der ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Inactivated Vaccine
An inactivated vaccine (or killed vaccine) is a vaccine consisting of virus particles, bacteria, or other pathogens that have been grown in culture and then killed to destroy disease-producing capacity. In contrast, live vaccines use pathogens that are still alive (but are almost always attenuated, that is, weakened). Pathogens for inactivated vaccines are grown under controlled conditions and are killed as a means to reduce infectivity and thus prevent infection from the vaccine. Inactivated vaccines were first developed in the late 1800s and early 1900s for cholera, plague, and typhoid. Today, inactivated vaccines exist for many pathogens, including influenza, polio (IPV), rabies, hepatitis A and pertussis. Because inactivated pathogens tend to produce a weaker response by the immune system than live pathogens, immunologic adjuvants and multiple "booster" injections may be required in some vaccines to provide an effective immune response against the pathogen. Attenuated vacci ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Attenuated Vaccine
An attenuated vaccine (or a live attenuated vaccine, LAV) is a vaccine created by reducing the virulence of a pathogen, but still keeping it viable (or "live"). Attenuation takes an infectious agent and alters it so that it becomes harmless or less virulent. These vaccines contrast to those produced by "killing" the virus (inactivated vaccine). Attenuated vaccines stimulate a strong and effective immune response that is long-lasting. In comparison to inactivated vaccines, attenuated vaccines produce a stronger and more durable immune response with a quick immunity onset. Attenuated vaccines function by encouraging the body to create antibodies and memory immune cells in response to the specific pathogen which the vaccine protects against. Common examples of live attenuated vaccines are measles, mumps, rubella, yellow fever, and some influenza vaccines. Development Attenuated viruses Viruses may be attenuated using the principles of evolution via serial passage of the virus ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Oviduct
The oviduct in mammals, is the passageway from an ovary. In human females this is more usually known as the Fallopian tube or uterine tube. The eggs travel along the oviduct. These eggs will either be fertilized by spermatozoa to become a zygote, or will degenerate in the body. Normally, these are paired structures, but in birds and some cartilaginous fishes, one or the other side fails to develop (together with the corresponding ovary), and only one functional oviduct can be found. Except in teleosts, the oviduct is not directly in contact with the ovary. Instead, the most anterior portion ends in a funnel-shaped structure called the infundibulum, which collects eggs as they are released by the ovary into the body cavity. The only female vertebrates to lack oviducts are the jawless fishes. In these species, the single fused ovary releases eggs directly into the body cavity. The fish eventually extrudes the eggs through a small genital pore towards the rear of the body. Fish and ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ureters
The ureters are tubes made of smooth muscle that propel urine from the kidneys to the urinary bladder. In a human adult, the ureters are usually long and around in diameter. The ureter is lined by urothelial cells, a type of transitional epithelium, and has an additional smooth muscle layer that assists with peristalsis in its lowest third. The ureters can be affected by a number of diseases, including urinary tract infections and kidney stone. is when a ureter is narrowed, due to for example chronic inflammation. Congenital abnormalities that affect the ureters can include the development of two ureters on the same side or abnormally placed ureters. Additionally, reflux of urine from the bladder back up the ureters is a condition commonly seen in children. The ureters have been identified for at least two thousand years, with the word "ureter" stemming from the stem relating to urinating and seen in written records since at least the time of Hippocrates. It is, however, onl ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Nephron
The nephron is the minute or microscopic structural and functional unit of the kidney. It is composed of a renal corpuscle and a renal tubule. The renal corpuscle consists of a tuft of capillaries called a glomerulus and a cup-shaped structure called Bowman's capsule. The renal tubule extends from the capsule. The capsule and tubule are connected and are composed of epithelial cells with a lumen. A healthy adult has 1 to 1.5 million nephrons in each kidney. Blood is filtered as it passes through three layers: the endothelial cells of the capillary wall, its basement membrane, and between the foot processes of the podocytes of the lining of the capsule. The tubule has adjacent peritubular capillaries that run between the descending and ascending portions of the tubule. As the fluid from the capsule flows down into the tubule, it is processed by the epithelial cells lining the tubule: water is reabsorbed and substances are exchanged (some are added, others are removed); first with t ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Avian Metapneumovirus
Avian metapneumovirus (aMPV), also known as turkey rhinotracheitis or swollen head syndrome, causes a variety of disease syndromes in birds, depending on the bird species and virus type (A, B, C or D). First detected in 1978 in South Africa, the virus has spread all over the world except Australia. It is mostly found in turkeys, pheasants, Muscovy ducks and guinea fowls. Turkeys are the most susceptible species for all subtypes. It is presumed that other species are immune. Etiology AMPV belongs to the genus Metapneumovirus alongside human metapneumovirus, both of which belong to the family Pneumoviridae. The spherical formed particles are 100 to 500 nm in diameter and the filamentous formed are 100 nm in width. Most of the particles are not highly pleomorphic but rounded. The virus is divided into four subtypes from A to D, which can be classified by the attachment of glycoprotein (G-protein). Subtypes A, B and D are more closely related in Europe than to the su ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
