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Yes, with the Delta variant herd immunity seems out of reach according to experts, as vaccines can't completely stop transmission:

https://www.theguardian.com/world/2021/aug/10/delta-variant-...

https://www.theatlantic.com/health/archive/2021/02/herd-immu...

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That's not strictly settled science. The truth is herd immunity / lack thereof is well within the error bars of the vaccine efficacy / R0 estimates. We don't actually know, but it looks like the delta curve is peaking in some areas so my bet is in favor of herd immunity.

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