Medical Dictionary

Vi antigen

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noun \ˈvē-ˈī-\

Medical Definition of Vi antigen

  1. :  a heat-labile somatic antigen thought to be associated with virulence in some bacteria (as of the genus Salmonella) and especially in the typhoid fever bacterium and used to detect typhoid carriers through the presence in their serum of agglutinins against this antigen


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