SEOUL — One dose of COVID-19 vaccines from AstraZeneca Plc and Pfizer was 86.6% effective in preventing infections among people aged 60 and older, real world data released by South Korea showed on Wednesday.
Data by the Korea Disease Control and Prevention Agency (KDCA) showed the Pfizer vaccine, jointly developed by BioNTech, was 89.7% effective in preventing infection at least two weeks after a first dose was given, while the AstraZeneca shot was 86.0% effective.
Its analysis is based on more than 3.5 million people in South Korea aged 60 and older for two months from Feb. 26 and included 521,133 people who received a first dose of either Pfizer or AstraZeneca shot.
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Keep on reading: South Korea says AstraZeneca, Pfizer COVID-19 vaccines 87% effective after first shot