What is the most plausible reason why it is necessary to update the flu vaccine yearly?

Question

Answer

Internal proteins within the virus continue to change due to antigenic drift

Answer

Most years the flu virus changes so much that existing immunity against the flu virus won’t provide any immunity against the new versions of the virus

Answer

Proteins on the surface of the virus continue to change due to antigenic drift

Answer

Each year the flu virus changes so much that existing immunity against the flu virus won’t provide any immunity against the new versions of the virus

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What is the most plausible reason why it is necessary to update the flu vaccine ...

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