The Delta variant of the coronavirus is the cause of more than 80% of new U.S. COVID-19 cases, but the authorized vaccines remain more than 90% effective in preventing hospitalizations and deaths, Dr. Anthony Fauci said during a Senate hearing https://t.co/EcmjerXz9E pic.twitter.com/JRaSMaHmTE— Reuters (@Reuters) July 21, 2021
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