I’m not a scientist either, but that question has been brought up and it certainly sounds feasible between the first and second shots:
Viruses also evolve, but the process is different and the result is usually much less severe when it comes to vaccines.
Paul Bieniasz, a Howard Hughes investigator at the Rockefeller University, is particularly concerned this could happen between the time of an initial vaccination and a second shot to maximize the immune response.
When a virus such as the coronavirus infects someone, that person’s immune system mounts a response. Viruses produce slight variations when they multiply, and if any of these variants can evade a person’s immune response, those variants are more likely to survive and possibly to spread to other people.So far, the concerning coronavirus strains have appeared in individuals who have not been vaccinated. But this evolution can happen in vaccinated people, as well.
"They might serve as a sort of a breeding ground for the virus to acquire new mutations," he says.This issue is part of a debate over the best timing of vaccine doses. Some scientists have argued that it would be better to use the scarce vaccines to give first doses to as many people as possible, so the maximum number of people have at least partial immunity. That could help slow the spread of the virus.
Bieniasz worries that would also hasten the evolution of new strains of virus.
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And so far, it seems that in the UK, they have just the one dominant variant. Haven’t checked recently so I could be wrong, but I haven’t heard of any other troubling mutations. They have only between 2-3 thousand new cases daily and seem to be doing the best job of any European country. They have been waiting 12 weeks between the first and second doses. Seems to be working. Just due to the pandemic, seems that leaving the EU has saved the lives of thousands of their citizens. I like everyone else thought Brexit was a bad thing. I have since changed my mind to being convinced it was the best thing they could’ve done. Sure, they left for the wrong reasons, but in the long run, it will be better for the UK.