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You will be protected for life against that exactsubtype/strain of the flu virus that was contained in the vaccine (or that you caught which caused you to be ill), and you will likely also have some cross-over protection from very similar strains.

However, viruses do mutate easily, and if later you are infected with another strain or mutation of the virus, and if your immune system does not recognize it any longer because it has mutated to a different form, then you may have no immunity to that new strain. This is one reason we need to take annual vaccines for the rapidly mutating common seasonal flu strains.

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11y ago

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