One dose of Covid-19 vaccines from AstraZeneca Plc and Pfizer was 86.6 per cent effective in preventing infections among people aged 60 and older, real world data released by South Korea showed.

Data by the Korea Disease Control and Prevention Agency showed the Pfizer vaccine, jointly developed by BioNTech , was 89.7pc effective in preventing infection at least two weeks after a first dose was given, while the AstraZeneca shot was 86pc effective.

Reuters reports that 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.

Read more here.