India will offer booster doses of Covid-19 vaccine to all adults from Sunday, although free third doses will be limited to frontline workers and those older than 60 who get them at government centres, reports Reuters.

The country has given 1.85 billion vaccine doses among its population of 1.35bn. Of these, 82 per cent are AstraZeneca doses made domestically and called Covishield.

Those older than 18 who received a second dose nine months ago will be eligible for the “precaution” dose, the health ministry said, using the government's term for boosters.