Study: 2 COVID vaccine doses much more effective than 1 against Delta

Vaccine needle going into arm
Jul 22, 2021

Two doses of either Pfizer or AstraZeneca vaccine were 80% effective against the Delta COVID-19 variant.

Source: Center for Infectious Disease Research and Policy

Total COVID-19 Vaccines Distributed = 393,929,955. Total Doses Administered = 340,363,922. Number of People Receiving 1 or More Doses = 187,579,557. Number of People Fully Vaccinated = 162,435,276.

*As of July 23, 2021 CDC COVID-19 Vaccination Data Tracker

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