In?uenza virus can exhibit constant mutation of viral glycoproteins, called antigenic ________, or alternatively antigenic ________, which is a more serious phenomenon caused by the exchange of a viral gene with that of another in?uenza virus strain.

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Antigenic drift refers to the minor changes or mutations in the virus's proteins, leading to new virus strains. Antigenic shift, on the other hand, is a more drastic change that occurs when two different strains of the virus combine to form a new subtype, potentially leading to pandemics.

In?uenza Virus Can Exhibit Constant Mutation of Viral Glycoproteins, Called