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Q:
Why do I need a vaccine shot to gain immunity? Why can't I just
be exposed to the pathogen instead?
A: Well, you will gain immunity
this way, but you will catch the disease that the pathogen
causes as well. Because unlike the real pathogen, vaccines are weakened
or partial forms of the pathogens and are not strong enough to make
you sick. Vaccines are usually given for diseases
that can be very dangerous, causing you to get very sick or even
die. By getting a vaccine, you can gain immunity
to the pathogen without risking the chance
that you'll get sick or die.
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