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Antibodies, Viral definition: Immunoglobulins produced as a response to VIRAL ANTIGENS; includes all classes of immunoglobulins elicited by all viral components.
antiviral antibody definition: immunoglobulins induced by exposure to viral antigens.
Antigens, Viral definition: Substances elaborated by viruses that have antigenic activity.
virus antigen definition: substances elaborated by viruses that have antigenic activity.
Bronchiolitis, Viral definition: An acute inflammatory disease of the upper RESPIRATORY TRACT, caused by paramyxoviruses, occurring primarily in infants and young children; the viruses most commonly implicated are PARAINFLUENZA VIRUS TYPE 3; RESPIRATORY SYNCYTIAL VIRUS, HUMAN; and METAPNEUMOVIRUS.
Conjunctivitis, Viral definition: Inflammation, often mild, of the conjunctiva caused by a variety of viral agents. Conjunctival involvement may be part of a systemic infection.
Cytopathogenic Effect, Viral definition: Visible morphologic changes in cells infected with viruses. It includes shutdown of cellular RNA and protein synthesis, cell fusion, release of lysosomal enzymes, changes in cell membrane permeability, diffuse changes in intracellular structures, presence of viral inclusion bodies, and chromosomal aberrations. It excludes malignant transformation, which is CELL TRANSFORMATION, VIRAL. Viral cytopathogenic effects provide a valuable method for identifying and classifying the infecting viruses.
virus cytopathogenic effect definition: visible morphologic changes in virus-infected cells effecting intracellular structures and cell functions, e.g. chromosomal aberrations, viral inclusion bodies, membrane permeability, and protein synthesis; do not confuse with CELL TRANSFORMATION.
DNA, Viral definition: Deoxyribonucleic acid that makes up the genetic material of viruses.
virus DNA definition: DNA that makes up the genetic material of viruses.
Genes, Viral definition: The functional hereditary units of VIRUSES.
Viral Gene definition: Genes of viral origin.
Hemagglutination, Viral definition: Agglutination of ERYTHROCYTES by a virus.
Hemagglutinins, Viral definition: Specific hemagglutinin subtypes encoded by VIRUSES.
Meningitis, Viral definition: Viral infections of the leptomeninges and subarachnoid space. TOGAVIRIDAE INFECTIONS; FLAVIVIRIDAE INFECTIONS; RUBELLA; BUNYAVIRIDAE INFECTIONS; ORBIVIRUS infections; PICORNAVIRIDAE INFECTIONS; ORTHOMYXOVIRIDAE INFECTIONS; RHABDOVIRIDAE INFECTIONS; ARENAVIRIDAE INFECTIONS; HERPESVIRIDAE INFECTIONS; ADENOVIRIDAE INFECTIONS; JC VIRUS infections; and RETROVIRIDAE INFECTIONS may cause this form of meningitis. Clinical manifestations include fever, headache, neck pain, vomiting, PHOTOPHOBIA, and signs of meningeal irritation. (From Joynt, Clinical Neurology, 1996, Ch26, pp1-3)
viral meningitis definition: viral infections of the leptomeninges and subarachnoid space.
Pneumonia, Viral definition: Inflammation of the lung parenchyma that is caused by a viral infection.
viral pneumonia definition: pneumonia (inflammation of the lungs) caused by a virus.
RNA, Viral definition: Ribonucleic acid that makes up the genetic material of viruses.
virus RNA definition: RNA that makes up the genetic material of viruses.
Genome, Viral definition: The complete genetic complement contained in a DNA or RNA molecule in a virus.
Viral Hepatitis definition: An acute or chronic inflammation of the liver parenchyma caused by viruses. Representative examples include hepatitis A, B, and C, cytomegalovirus hepatitis, and herpes simplex hepatitis.
Viral Interference definition: A phenomenon in which infection by a first virus results in resistance of cells or tissues to infection by a second, unrelated virus.
interfering virus definition: a virus which prevents replication of another virus; may be due to blocking of virus attachment sites or the presence of defective interfering particles which block the replication of competent ones.
Viral Proteins definition: Proteins found in any species of virus.
virus protein definition: proteins found in any species of virus.
Viral Protein definition: Proteins found in any species of virus.
Viral Vaccines definition: Suspensions of attenuated or killed viruses administered for the prevention or treatment of infectious viral disease.
viral vaccine definition: suspensions of attenuated or killed viruses administered for the prevention or treatment of infectious viral disease.
Virion definition: The infective system of a virus, composed of the viral genome, a protein core, and a protein coat called a capsid, which may be naked or enclosed in a lipoprotein envelope called the peplos.
virion definition: the infectious unit of a virus.
virion definition: The complete fully infectious extracellular virus particle. [ISBN:0781718325]
Virus Activation definition: The mechanism by which latent viruses, such as genetically transmitted tumor viruses (PROVIRUSES) or PROPHAGES of lysogenic bacteria, are induced to replicate and then released as infectious viruses. It may be effected by various endogenous and exogenous stimuli, including B-cell LIPOPOLYSACCHARIDES, glucocorticoid hormones, halogenated pyrimidines, IONIZING RADIATION, ultraviolet light, and superinfecting viruses.
Virus Diseases definition: A general term for diseases produced by viruses.
virus disease definition: disease produced by viruses.
Viral Infection definition: Any disease caused by a virus.
Virus Integration definition: Insertion of viral DNA into host-cell DNA. This includes integration of phage DNA into bacterial DNA; (LYSOGENY); to form a PROPHAGE or integration of retroviral DNA into cellular DNA to form a PROVIRUS.
virus integration definition: naturally occurring process of insertion of viral DNA into the host genome; not a genetic technique.
Virus Shedding definition: The expelling of virus particles from the body. Important routes include the respiratory tract, genital tract, and intestinal tract. Virus shedding is an important means of vertical transmission (INFECTIOUS DISEASE TRANSMISSION, VERTICAL).
Virus Latency definition: The ability of a pathogenic virus to lie dormant within a cell (latent infection). In eukaryotes, subsequent activation and viral replication is thought to be caused by extracellular stimulation of cellular transcription factors. Latency in bacteriophage is maintained by the expression of virally encoded repressors.
Virus Physiological Phenomena definition: Biological properties, processes, and activities of VIRUSES.
Viral Function definition: Biological functions, activities, or processes of viral elements that support the viability, propagation, or maintenance of a virus. (NCI)
Virus Assembly definition: The assembly of VIRAL STRUCTURAL PROTEINS and nucleic acid (VIRAL DNA or VIRAL RNA) to form a VIRUS PARTICLE.
virus assembly definition: coming together of the constituent parts of a virus particle; process can vary from autoassembly of protein subunits around the viral nucleic acid to assembly of complex viruses at cell membranes.
virion assembly definition: A late phase of viral replication during which all the components necessary for the formation of a mature virion collect at a particular site in the cell and the basic structure of the virus particle is formed. [ISBN:0121585336]
Viral Load definition: The quantity of measurable virus in a body fluid. Change in viral load, measured in plasma, is sometimes used as a SURROGATE MARKER in disease progression.
Viral Load definition: The number of viral particles (usually HIV) in a sample of blood plasma.
viral definition: Having to do with a virus.
viral carcinogenesis definition: process by which normal cells are transformed into cancer cells by means of a virus.
Viral Carcinogenesis definition: Studies of the role of viruses as factors or cofactors in the etiology of human and animal cancer.
Virus Inactivation definition: Inactivation of viruses by non-immune related techniques. They include extremes of pH, HEAT treatment, ultraviolet radiation, IONIZING RADIATION; DESICCATION; ANTISEPTICS; DISINFECTANTS; organic solvents, and DETERGENTS.
viral capsid definition: The protein coat that surrounds the infective nucleic acid in some virus particles. It comprises numerous regularly arranged subunits, or capsomeres. [GOC:mtg_sensu, ISBN:0198506732 "Oxford Dictionary of Biochemistry and Molecular Biology"]
Cancer, Viral definition: Virus as an agent in the cause of a cancer.
Viral Tropism definition: The specificity of a virus for infecting a particular type of cell or tissue.
Viral Structures definition: The structural parts of the VIRION.
viral definition: [1] Medizin: von Viren verursacht [2] Medizin: das Virus betreffend