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07-30-2021, 09:32 AM
Infections in vaccinated Americans also may be as transmissible as those in unvaccinated people, the document said, and lead more often to severe illness.
More... (https://www.nytimes.com/2021/07/30/health/covid-cdc-delta-masks.html)
More... (https://www.nytimes.com/2021/07/30/health/covid-cdc-delta-masks.html)