Question 19 (3 points)
ices a sign saying that flu shots are available in the pharmacy, Enrique says, "I got a flu shot last year. I don't need
another one. That shot made me immune to the flu forever."
Which statement is most useful for evaluating Enrique's statement?
Viruses remain essentially the same from year to year, but a vaccine wears off over
time.
Viruses constantly change and evolve, and the new shot will be effective against this year's viruses.
Viruses are nonliving, so vaccinations against them are especially powerful and long-lasting.
Viruses are nonliving, so vaccinations against them have little value.