Interim data from the Indian arm of Oxford-AstraZeneca vaccine candidate AZD1222 (also known as Covishield) has shown the lowest efficacy results of 60-70 per cent. Pune-based Serum Institute of India (SII) is conducting phase-3 trials on 1,600 Indian volunteers, with people in the know indicating that these trials are being done with two full doses. So far, they added, trials have shown efficacy of 60-70 per cent. If the primer-booster regimen (half dose followed by a full dose) has to be adopted, SII would need to conduct additional tests.
On the Oxford-AstraZeneca vaccine, an SII spokesperson said: “The AstraZeneca-Oxford vaccine is