You and a number of others here declare it a myth.

My homecountry is highly developed and one of the best of the world to live in. We belong to the tallest in the world, thanks to good food, good living conditions, good healthcare, etc. In some areas people live who do not want their children vaccinated because of religion. Despite having all you think is enough, and living among vaccinated persons, in those areas people still get seriously ill from contageous diseases, with often bad outcomes.