"I think it would be difficult to prove that vaccines have cured any diseases. I think you will find that cleaning up sanitation laws, inspection of cattle and stuff like that, getting rid of diseased creatures and diseased crops is really what has done the job. Now there may be a coincidence they happened at the same time. Like when they started, you know, vaccinating for one thing and at the same time had better sanitation laws and inspections. It may look like the vaccine cured the disease when actually something else cured the disease."
Who came up with that idea? I know it is wrong. For example, the early smallpox vaccine was based on cowpox. He gave it to someone, and exposed them to smallpox. The test subject did not get smallpox.