Delta variant shown more in vaccinated per a Massachusetts study
https://arstechnica.com/science/2021/07/this-900-person-delta-cluster-in-mass-has-cdc-freaked-out-74-are-vaccinated/
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https://arstechnica.com/science/2021/07/this-900-person-delta-cluster-in-mass-has-cdc-freaked-out-74-are-vaccinated/
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