It is now recommended that all people over the age of 6 months should receive a flu

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It is now recommended that all people over the age of 6 months should receive a flu vaccine every fall based on the understanding that the vaccine is repeated because 

a. The immunity wears off after a year. 

b. The strains of virus predicted to cause the flu change every year. 

c. A booster shot will activate the immune system. 

d. Flu shots do not produce good antibodies.

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