The delta variant took over because it is much more infectious than the alpha variant, period. Its emergence in India was not because of high rates of vaccinat

The delta variant took over because it is much more infectious than the alpha variant, period. Its emergence in India was not because of high rates of vaccination. In fact, quite the opposite. Also, I think you are misinterpreting the plots on next strain. Look at the distributions of variants in different countries on the world map. Vaccination timelines in the US/UK/EU did not coincide with most other parts of the world. In many of those places there is still not widespread access to vaccines. Taken all together one can infer that (1) countries with widespread vaccine availability are less impacted by the delta variant. And (2) the rise in the proportion of delta variant cases is being driven by infections outside of countries with widespread access to vaccines.