It’s too much of a coincidence for the delta to have two separate mutations - one that makes it more transmissible, and two, which makes it escape vaccines. It’s a recipe for massive spread and a proportionally higher death toll to go with it. Then you look at where it originated - India, a country at war with China. After India got ravaged in the second wave (delta) a CCP official tweeted a photo mocking India’s Covid cases. I just don’t believe it’s a random mutation.
Maybe, but high reproduction is a natural evolutionary goal for a virus.
More on immunity:
https://twitter.com/MonicaGandhi9/status/1416618945113583616
“... it’s important to add something about memory B cells and their longevity to this thread (and how natural infection induces them as shown in bone marrow biopsies; and vax induces them as shown by lymph node biopsies). And finally, you say,..
will those memory B cells be able to produce antibodies directed against variants in the future if they see a variant? This study shows us, yes. Those newly-produced antibodies will adapt to the variant at hand to fight it...
Having 11 mutations across a spike protein cannot knock out all 87 T cells (beta knocks out 13) so you should still be protected from severe disease; our severe breakthrough rate with vax (0.002%) has remained unchanged through delta
https://cdc.gov/vaccines/covid-19/health-departments/breakthrough-cases.html