The immune system is an amazing instrument of the human body

The immune system is an amazing instrument of the human body. The value of a healthy immune system means that the body will fight off disease. Vaccination manipulates an important component of the immune system by selectively building immunity against a pathogen that we target, and has played an important role in disease prevention and epidemiology. The topic of vaccination has become quite controversial for some people, and growing numbers of our population refuse to vaccinate their children, even in our modern times. In this discussion post some common arguments "for" versus "against" vaccinating. Note the sources from which you find each argument. Which arguments are supported with peer-reviewed scientific research? In your search, did you find regions in the U.S. where diseases that were once rare have resulted in outbreaks in communities who are predominantly against vaccination?