you need a flu shot every year/season because (HA- haemoagglutinin; NA-neuroaminidase):flu virus gets rid of...
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you need a flu shot every year/season because (HA- haemoagglutinin; NA-neuroaminidase):flu virus gets rid of its HA and NA and replace them with completely new ones every yearthe virus can change its HA and NA every year, so a new shot is needed to teach your immune system how to recognize the changed HA and NAyour immune system weakens after a year-so you have to get another shot to get the system strong enough to attack the virusantigen shift occurs every year

you need a flu shot every year/season because (HA- haemoagglutinin; NA-neuroaminidase):flu virus gets rid of its HA and NA and replace them with completely new ones every yearthe virus can change its HA and NA every year, so a new shot is needed to teach your immune system how to recognize the changed HA and NAyour immune system weakens after a year-so you have to get another shot to get the system strong enough to attack the virusantigen shift occurs every year
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