[nradov]

The Delta variant is sufficiently contagious that we can't achieve any real herd immunity through vaccination. It's still important to get vaccinated to protect yourself.

https://www.businessinsider.com/delta-variant-made-herd-immu...

Those calculations of herd immunity threshold percentages were usually over simplified based on the assumption that immunity is a binary condition. But in reality while vaccinated people are less likely to suffer severe symptoms they can still get infected and spread the virus.