Flu shots are vaccines against the most common strains of the flu virus. Most vaccines are rarely changed but new flu vaccines are produced every year. Why are flu shots constantly being reformulated?
A) The flu virus is not completely known.
B) Certain parts of the viral genome are reshuffled by mutations and recombination.
C) The virus mixes with prions.
D) The virus shifts from RNA to DNA.
Correct Answer:
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