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How are vaccines being tested in clinical trials? How is their effectiveness tested?

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There have been many unfair myths about vaccines recently. No one should doubt that vaccines are one of the most useful inventions of the 20th century. Nevertheless, the group of opponents of vaccines is constantly growing. There is so much untrue information circulating about vaccinations that many people can simply be misled. Since not everyone can go to clinical trial training, it is worth explaining what the trial looks like.