: MeSH: Antigenic Variation

Immune System Phenomena > Immunogenetic Phenomena > Antigenic Variation

Genetic Phenomena > Genetic Variation > Antigenic Variation

Antigenic Variation

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Change in the surface ANTIGEN of a microorganism. There are two different types. One is a phenomenon, especially associated with INFLUENZA VIRUSES, where they undergo spontaneous variation both as slow antigenic drift and sudden emergence of new strains (antigenic shift). The second type is when certain PARASITES, especially trypanosomes, PLASMODIUM, and BORRELIA, survive the immune response of the host by changing the surface coat (antigen switching). (From Herbert et al., The Dictionary of Immunology, 4th ed) Antigenic variation as the pathogen passes through an entire host population rather than just a single host.

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