> If there's a reasonable theory why this is, please explain. The % of Americans fully vaccinated is too low to achieve herd immunity against the more transmis

> If there's a reasonable theory why this is, please explain. The % of Americans fully vaccinated is too low to achieve herd immunity against the more transmissible delta variant. > no democracy has been more aggressive about vaccinations than Israel Israel is no longer even in the top 30 countries in terms of % of population fully vaccinated. Where they are having success is controlling breakthrough infections after a 3rd dose. > I'd suggest that the properties of the vaccines (minimizing symptoms) makes it so that vaccinated people don't quickly realize that they're sick and go about their business normally and some can act as unwitting super-spreaders. There is no evidence the vaccine delays symptom onset. It reduces the chances of severe symptoms and death. > I'd discount it as unlikely given how viruses tend to mutate towards being less lethal in order to spread more The delta variant originated in India, which was at the time the world’s largest population of unvaccinated people. No variants have emerged from highly vaccinated populations.