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Why do some people become ill with the flu even if they have received the flu vaccine?

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GinnyAnsweridn

Final answer:

Flu vaccines may not fully protect against evolving flu strains due to rapid virus mutations.


Explanation:

Viruses, like the flu, evolve very quickly due to mutations and replication, making it challenging for vaccines to provide complete protection year after year.

Because the flu virus mutates annually, the vaccine developed for one flu season may not be effective against the strains circulating in the next season.

Individuals who still get the flu after vaccination may experience this because viral surface molecules undergo continuous mutation, necessitating new vaccine formulations each flu season.


Learn more about Influenza vaccine effectiveness here:

https://brainly.com/question/39121211


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