Definition of "antigenic" []

• Of or relating to an antigen. (adjective)

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• "This influenza virus, like all influenza viruses, can mutate via a process called antigenic drift, which can make it either more or less virulent."
• "New viral strains arise through a process called antigenic shift, or reassortment, when at least two viruses combine."
• "These errors, which result in what is called antigenic drift, explain why the flu virus is different each season and why new vaccines are needed each year."