India has administered more Covid-19 vaccine doses in the last two weeks than the number of people who signed up for shots during the period, government data cited in a Reuters report shows, signalling improving supplies after widespread shortages.

Rising production at the Serum Institute of India, the world's biggest vaccine maker, has boosted the availability of Covid-19 shots in the country this month.

The company is on course to raise monthly output of the AstraZeneca vaccine to 100 million doses or more from July, from about 90 million this month and about 65 million in May.

That has helped India administer 61 million doses in the last two weeks starting June 12, compared with 58 million registrations for vaccination on the government's Co-Win vaccination website.

It was the first time vaccinations exceeded registrations since the immunisation drive was expanded from May 1.