Question 11
Which statement BEST explains why the influenza vaccine must be updated every year?
a
In some years, the influenza vaccine kills the virus, while in other years it does not.
b
In some years, the influenza vaccine is not as strong as in others.
c
The influenza virus adapts and mutates every year, so new vaccines must be produced.
d
The influenza vaccine does not necessarily stimulate the immune system to produce antigens.
Question 12
When a new viral infection appears, scientists try to develop a vaccine to destroy the virus. What would most likely be contained in the new vaccine?
a
a live bacterium that ingests the virus
b
a weakened form of the virus itself
c
a microbe that attacks the virus
d
a white blood cell from an infected individual
b
a weakened form of the virus itself