DDT is a pesticide that was widely used after World War II and was sometimes sprayed in a vain attempt to keep polio outbreaks from getting out of control. That is the only connection to polio though.
Dr. Ignaz Semmelweis was ahead of his time in the mid-19th Century when he tried to get doctors to wash their hands to avoid getting their patients sick.
As you follow the anti-vaccine movement from the very beginning, it is easy to see the common threads that connect all of the players from the Victorian Age to the 21st Century. Germ theory denialism. Alternative medical providers. The media. What else? Fear, especially fear of vaccine-injury.
Many chiropractors push anti-vaccine myths and don’t believe in the germ theory of infectious disease.