The evidence for it is overwhelming. I read something to that effect from a soldier in the trenches in World War One, that troops dumb enough to let the medics at them with their inoculations were instantly quarantined by the other soldiers and often died not soon afterwards.
Doctors from just a couple decades back would consider "modern" vaccine theory to border on Dark Age pagan witchcraft. If doctors discovered that their vaccines carried live cultures, they could explain to you in one second why you were sentencing your patients to death by injecting them. You would be bypassing their natural immune system to go right to their bloodstream. It is utterly insane and vaccination is actually becoming a kind of white man's voodoo it is so irrational. They don't even try to make sense of what they are doing anymore, they just plunge that thing into your veins if you don't stop them. Even they can no longer explain the theory of what they think is happening. They don't think that deeply on any subject. They just push the plunger if you don't stop them.
A while back one of them was swabbing my arm with alcohol during a routine checkup. He was tapping the syringe before he decided to tell me what was in it. I asked him, did he know I was strong enough to force that syringe in one ear and out the other side of his head without breaking it? He deferred my treatment. Otherwise God only knows what he was about to stick me with. I think he was mumbling about tetanus. I told him I would take my chances but he better put the syringe away. Turns out that tetanus is afraid of Neanderthals, not the other way around. The tetanus germs, if they were there, appear to have died before I did. They fell on their own swords when they realised they were in the courtyard of a Neanderthal immune system. I left their bodies piled beside a million other victims that day, none of them stopped by a vaccination. Turns out the body left to it's own devices if healthy wipes out billions of these critters each day without blinking an eye. It is just that easy.
I just don't know how people survived before doctors. They probably had to endure the slings and arrows of life to a much older age, wistfully looking forward to a day when advanced scienmajists would jab them and their kids with mercury, formaldehyde and aluminium.