Tens of millions of Indian adults are unlikely to be fully vaccinated against Covid-19 by the end of 2021, despite ample supplies, due to an unusually large gap between the doses of the most widely used vaccine and growing complacency as cases fall, Reuters reports.

The locally produced AstraZeneca vaccine which is known as Covishield has a 12- to 16-week gap between doses, in contrast to the 8- to 12-week gap recommended by the World Health Organisation.

Based on current trends, the Covishield dosage gap means more than 200 million people will be eligible for their second dose only in late January even if all of them were to get their first shot on Friday.

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