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If you get it before the age of 65 (like say at age 35) you do not need to get it again until you then turn 65 years old. Therefore in this scenario you would get the vaccine twice in your lifetime.
However if you get the vaccine within 5 years of turning 65 years old (like say at age 62) then you do not need to get it ever again for as long as you live.
The final scenario is that if you get the vaccine after the age of 65 (like say at age 70) then you also do not need ever to get the vaccine again for as long as you live.
At the most, a person would receive the vaccine twice in their lifetime.
Now the flu vaccine is another story. The influenza virus is clever and
mutates to have the potential of introducing new strains ever flu season.
The expert from JHU on C-Span yesterday said that the flu vaccine is good for
about 9-10 months only. So it will last for the standard flu season, but
that's it. It's a an annual vaccine and it won't even make it 100% certain
that you will not get the flu, however if you do get it the severity and
duration should be reduced.
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