With Diwali and other major religious celebrations fast approaching, fears are growing that India could be hit by a festival-fuelled surge in coronavirus cases.

The southern state of Kerala – previously hailed as a model for its actions in containing the virus – has already been hit by a fresh spurt of infections attributed to people mingling during the 10-day Onam festival in August. Health experts now fear similar problems could emerge as North India enters its festival season in the run up…