You’re misunderstanding the concept. It isn’t that it creates immunity in individuals. It’s that it collectively insulates a population from reinfection. Depending on the disease 90+% vaccination rates leave too few individuals vulnerable to infection for the disease in question to take hold and spread.
It is the collective “immunity” of a population.
Because what they’re suggesting is nonsense.
This kind of collective insulation from a disease does not, and largely can not come about from infection with the disease. And attempting to do it as a strategy is massively, massively unethical. Completely discarding the base point of medicine. You’d need nearly the entire population to be infected simultaneously, at a death rate that’s currently at 5% ish in the US.
And you’d have to do that continually till the disease peters out on it’s own. And hope it doesn’t mutate.
It’s also reliant on the sort of long term, reliable immunity that infection with many diseases does not provide, and mutations of said disease can’t get around. The kind of immunity we get from certain vaccines.
We’ve never achieved what they’re suggesting because what they’re suggesting isn’t at all how it works.
To the extent that that take on the subject is valid at all. It’s in epidemiology for shit like “why did this massive historical epidemic end on it’s own despite the lack of modern medicine”.
Smallpox is eradicated from the wild. As is rinderpest, a cattle disease. A core part of how we achieved that was herd immunity. These diseases ceased to be endemic in any area of the world in part because the unvaccinated population in areas where it was. Was too small for the disease to continue spreading through these areas, couldn’t get at the unvaccinated.
If smallpox got out in any area we could 1 quarantine the area, 2 reinstitute broad vaccination at rates that insulate those who can not be vaccinated. And it would be gone again.
No one talks about herd immunity to Smallpox. Because there isn’t enough Smallpox in the world for us to even vaccinate broadly anymore.
We are rediculously close to eradicating polio globally, and it has been eradicated for the most part from Europe and the US. Despite the fact that when it was straight up epidemic here, not everyone was vaccinated. Because herd immunity insulated the unvaccinated from the disease, preventing it from establishing itself in the overall population.
We have, and continue to achieve real herd immunity on all sorts of diseases. This is why when measles, formerlly eradicated from the US, began to pop up again. It did not rocket across the country through immuno compromised people and folks for whom immunity faded or the vaccine failed.
While anti-vaxers undermine herd immunity in specific populations, allowing the disease to take hold there. The next one over, there aren’t enough unprotected people for it to do the Covid globally or even nation wide.
Even the anti-vaxers and the knob in the article aren’t arguing herd immunity conveys literal immunity to individuals.
The base concept is what level of immunity, usually from vaccination, you need to prevent a disease from living in a population. Because practically you can not vaccinate 100%.
They’ve just twisted it to argue it can be done by letting a disease live in a population.
See the rest of my comment. It’s not.
You can’t insulate vulnerable individuals in a population from a disease by giving everyone the disease.
It’s like “intelligent design”. Taking some crazy and making it sound like science by cribbing terminology without understanding it or reference to it’s actual meaning.