Multi factor. Starts off by saying most diseases declined in mortality because of improvements to living standards. She debunks polio, saying people still get it today, they just end up on a ventilator instead of an iron lung. Says how the smallpox vaccine was completely ridiculous and un-sterile. Talks about sv40 in the polio shot. They talk about the fact vaccination has almost become a modern day religion. Just what i can remember off the top of my head.