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DictionarySeeantigenicantigenic drift
antigenic drift[‚an·tə¦jen·ik ′drift] (immunology) Minor change of an antigen on the surface of a pathogenic microorganism. antigenic drift
drift [drift] 1. slow movement away from the normal or original position.2. a chance variation, as in gene frequency from one generation to another; the smaller the population, the greater are the random variations.antigenic drift relatively minor changes in the antigenic structure of a virus strain, probably resulting from natural selection of variants circulating among an immune or partially immune population. See also shift" >antigenic shift.ulnar drift ulnar deviation.an·ti·gen·ic driftthe process of "evolutionary" changes in the molecular structure of DNA/RNA in microorganisms during their passage from one host to another; it may result from recombination, deletion, or insertion of genes, point mutations or combinations of these events; it leads to alteration (usually slow and progressive) in the antigenic composition, and therefore in the immunologic responses of individual people and populations to exposure to the microorganism concerned; common with influenzavirus.an·ti·gen·ic drift (an'ti-jen'ik drift) The process of "evolutionary" changes in molecular structure of DNA/RNA in microorganisms during their passage from one host to another; it may be due to recombination, deletion, or insertion of genes, point mutations, or combinations of these events; it leads to alteration (usually slow and progressive) in the antigenic composition, and therefore in the immunologic responses of individual people and populations to exposure to the microorganism concerned. antigenic drift minor changes in the surface ANTIGENS of INFLUENZA VIRUS, resulting from MUTATION and subsequent selection by the immune system of human and animal populations. These changes occur slowly over periods of years. See IMMUNITY.an·ti·gen·ic drift (an'ti-jen'ik drift) The process of "evolutionary" changes in molecular structure of DNA/RNA in microorganisms during their passage from one host to another; affecting the immunologic responses of people and populations to exposure to the microorganism concerned. ThesaurusSeedrift |