There are many reasons that parents cite when it comes to not vaccinating, but there are decades of great scientific and medical research that shows those concerns aren't justified. Unfortunately, it's difficult for us to get that information out to the people who need to hear it. There are so many conflicting sources of information at people's fingertips, especially on the Internet, and it can be hard for someone to determine what's accurate and from a trusted source, and what my look scientific but is actually misleading.