Effectiveness of COVID-19 Vaccines in Preventing SARS-CoV-2 Infection Among Frontline Workers Before and During B.1.617.2 (Delta) Variant Predominance — Eight U.S. Locations, December 2020–August 2021 – CDC Morbidity and Mortality Weekly Report Commentaries: Vaccines are less protective against Delta infection but still reduce risk by two-thirds, US CDC study shows – CNN Messenger RNA COVID […]

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