I'm gathering these links together for a friend looking for info about why to vaccinate her child. Since I'm on tablet, I'm having trouble linking them all. The URLs will need to be copied into your browser.
https://www.cdc.gov/vaccines/vac-gen/howvpd.htm
https://www.vaccines.gov/more_info/features/five-important-reasons-to-vaccinate-your-child.html
http://www.nfid.org/about-vaccines/reasons
About vaccine safety
https://www.livescience.com/57488-vaccine-safety-numbers.html
https://www.healthychildren.org/English/safety-prevention/immunizations/Pages/How-Safe-are-Vaccines.aspx
https://www.vaccines.gov/basics/safety/index.html
https://www.cdc.gov/vaccinesafety/index.html
This sums it up