An Unfounded fear about vaccines has led measles, a preventable disease, to make a comeback in the United States due mostly to parents refusing to vaccinate their children. Before the vaccine, measles killed 400-500 people each year in the United States. By comparison, modern vaccines are safer than not vaccinating. It is imperative that we understand how the measles virus works and what it can do to our bodies. The following video from the Seeker YouTube channel explains this simply and concisely.