India will revisit Covishield dosage gap based on emerging data: Official

On the decision to increase the gap between two doses of Covishield from four-six weeks to 12-16 weeks, NTAGI chairman said the move was based on scientific data

India is considering the emerging evidence on the efficacy of partial versus full immunisation with discussions going on since mid-May on whether the country should revert to 4-8 week gaps between two doses of Covishield vaccine, said Chairman of India's Covid-19 Working Group of NTAGI, Dr N K Arora.

 These discussions started after the reports from the UK showed that a single dose of AstraZeneca, which is the same as Covishield, gave only 33 per cent protection while two doses gave 60 per cent protection. This data emerged 2-3 days after India took the decision to increase the dose gap