India's rising output of Covid-19 vaccines and the inoculation of more than half of its adult population with at least one dose are raising hopes the country will return as an exporter within months, ramping up from early next year.

The Serum Institute of India, the world's biggest vaccine maker, is now producing about 150 million doses a month of its version of the AstraZeneca shot, more than twice its April output of about 65m, a source with knowledge of the matter said.

"No fixed timeline on exports but the company hopes to restart in a few months," said the source, who declined to be named without approval to talk on the matter.

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