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Yes of course, no i understand that.
The point is without vaccinated people you never get vaccine resistant strains. However even if you vaccinated 100% of people, since the vaccines cant achieve herd immunity even at 100% vaccination then you will get vaccine resistant straints even with 100% vaccination.
So its clear through simple inductive reasoning that you need vaccinated people to produce vaccine resistant strains, you dont necessarily need unvaccinated people to do it (the only exception being if you could achieve herd immunity and cause the virus to become extinct or near to it.
@olamundo @hans_w also no, unvaccinated countries are very unlikely to introduce vaccine resistant strains. A vaccine resistant strain can not thrive in an unvaccinated country and will likely not have a high enough R0. So it wont ever get beyond a dozen or so infected individuals (if it even gets that far) before dying off by being out competed by the main branch.
The only way a vaccine resistant strain is likely to get very far is when it is created in a vaccinated person with partial immunity or hops directly from patient 0 to a vaccinated person.
So vaccine resistant strains need vaccinated people in a high perpetration of the population to be a potential. As you get closer to 100% vaccination (when herd immunity inst possible) you increase the chances of such strains rather than decrease it.
