Effectiveness of coronavirus vaccines

A University of Oxford study has found that the Oxford-AstraZeneca vaccine could cut Covid-19 transmission by two-thirds. It is the first time that a vaccine has been shown to reduce the spread of the virus

 
ESTIMATED EFFECTIVENESS OF COVID-19 VACCINES (%)
Based on interim data from late-stage clinical trials* (date of study data) 

Pfizer-BioNTech	(Nov 18, 2020)   95
U.S.-Germany

Moderna		(Nov 30, 2020)   94.1
U.S.

Sputnik V	(Feb 2, 2021)   91.6
Russia

Novavax		(Jan 28, 2021)   89.3
U.S.

Oxford-AstraZeneca (Feb 2, 2021)   82.4
Britain-Sweden

Johnson & Johnson (Jan 29, 2021) 66†
U.S.-Belgium

Sinovac		(Jan 12, 2021) 50.4‡
China

 *Some trials are ongoing and findings have not been peer-reviewed. Vaccine effectiveness may differ with new Covid-19 variants

†Overall effectiveness. Vaccine was 72% effective in U.S. trials

‡Based on Brazil trials


Oxford-AstraZeneca
As well as showing effect on transmission, trial data found that vaccine offered 76 percent effectiveness from 3-12 weeks after injection, with no drop-off in protection
Effectiveness rose to 82.4 percent following second dose after 12 weeks


Sources: BBC, New York Times, Statista 
Picture: Getty Images 
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