Multiple Choice
Although vaccination can provide a lifelong protection against some diseases, flu vaccines are rarely effective against next year's flu because the virus that causes flu
A) is not alive.
B) can evolve quickly.
C) can change its cell membranes and block the action of the vaccine.
D) can develop into immune bacteria and neutralize the action of the vaccine.
Correct Answer:
Verified
Correct Answer:
Verified
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