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During previous flu seasons, small variations in the influenza virus resulted in the immune system's inability to full recognize and respond to flu exposure. As a result, the vaccine was less than 30% effective. This is an example of _____.

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ajinems

This is an example of antigenic drift.

What is antigenic drift?

Antigenic drift is defined as the changes that occur during replication in the genes encoding antigens in an organism due to mutations.

When these mutations occur in virus such as the influenza virus, the immune system would not be able to fully recognise the new viral mutant thereby rendering the administered vaccine less effective.

Learn more about vaccines here:

https://brainly.com/question/625596

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