India`s new COVID-19 vaccine plan is to study mixing doses

"We have heard recently that Europe, Spain and the UK are also doing a study where two vaccines-- Covishield and Pfizer-- have been given on alternate days," said Dr N K Arora, Chairman of COVID-19 working group under NTAGI.

source https://zeenews.india.com/india/indias-new-covid-19-vaccine-plan-is-to-study-mixing-doses-2365783.html