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Vaccines are always 100% effective for every person who receives them, so outbreaks can never happen after vaccination.

Many people dislike getting shots because needles can be scary.

The first vaccine was invented a long time ago, and medicine has improved since then.

Vaccines can reduce the spread of contagious diseases by helping more people become immune, which lowers the chance that an infected person will pass the disease to others (a community effect often called herd immunity).