Why are new flu shots necessary every year?
A) The flu is caused by either bacteria or viruses, depending on the year.
B) The shots do not result in the production of memory cells.
C) Flu viruses mutate rapidly.
D) The antiviral chemicals in flu shots last only 11 months.
Correct Answer:
Verified
Q50: Which of the following can make plasma
Q51: Imagine that the immune cells of your
Q52: Which of these is a function of
Q53: Which of the following provides cell-mediated immunity?
A)B
Q54: Vaccinations protect against future exposure to disease
Q56: Vaccinations are effective because they stimulate the
Q57: Life-long immunity to a disease after a
Q58: Vaccinations involve injecting _ into the person
Q59: No antibiotics are effective against:
A)bacteria.
B)viruses.
C)fungi.
D)protists.
Q60: Each B cell of the immune system
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