Question

If a vaccine protects you for most of your life against a particular pathogen, why do you need a new flu shot every year? A. Influenza evolves very quickly and its antigens mutate so that your memory cells from the last vaccine won’t recognize it. B. Influenza is so strong that you need a booster every year to make sure your body can fight it. C. Influenza is a virus, and vaccines only generate memory cells for bacterial infections. D. You don’t need it every year, it is just offered every year for anyone who does not have it yet.

Answer 1

A.

Step-by-step explanation:

Influenza evolves very quickly and its antigens mutate so that your memory cells from the last vaccine won’t recognize it.

The 2020 influenza vaccine was not as efficient because scientists were scrambling to put out a vaccine for Coronavirus. Consequently, Coronavirus cases skyrocketed during the flu season.
Hope this helped!

also.. i have to put coronavirus and not "c0vid-19" because apparently it's too political. lol.

Answer 2

If you got a flu shot this year, next year you'll need it again.

Step-by-step explanation:

This is because the virus changes, usually rendering the previous year's vaccine partly or totally useless. hope this helps you :)