Covishield, which is the main Covid vaccine in use in India, accounts for nearly 90 per cent of the 208.89 million doses administered since January 16. “A platform is being established where three sets of administrative data in terms of diagnostic data, vaccine data and the overall disease data are to be harmonised. Discussions on the need to study the effectiveness of Covid vaccines began in March-April, according to Arora. “An argument being placed is that other viral vector vaccines have single-dose versions, and this might work for Covishield too, which started out as a single-dose vaccine,” the source said. The AstraZeneca vaccine started out as a single-dose formulation, before being calibrated as a two-dose vaccine based on efficacy reports.

Source: Indian Express May 30, 2021 22:30 UTC