What are the advantages of being vaccinated?
When one is vaccinated, the risk of getting the disease they are
being vaccinated against goes down greatly. They are also at less
risk of being a carrier of the disease and passing it onto those
who cannot fight the disease off, such as the elderly, the young,
and those with compromised immune systems. Herd immunity is caused
by most people getting the vaccine, and protecting those who are
unable to get the vaccine.
Also, certain diseases that are more common in other countries
can travel to countries where that disease is less common. Many
people may no longer be vaccinated against the disease, and it may
result in a deadly outbreak.
In the big picture, vaccination reduces both the incidence and
impact a disease has in a large population. While the (very) rare
individual may experience harmful side-effects of certain vaccines,
the overall population will be much more resistant (and, possibly
even immune) to infection by the disease inoculated against.