If Our Bodies Are Capable of Secondary Responses, How Do

If our bodies are capable of secondary responses, how do people contract influenza more than once?

A) Memory cells lose their ability to recognize antigens after six months.
B) The affinity of antibodies diminishes in the secondary response.
C) New varieties of flu virus continuously evolve.
D) Our bodies cannot launch a strong enough immune response against the flu virus.
E) There are no effective vaccinations for the flu.

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