India’s second Covid wave undermines herd immunity theory

Easing of lockdown restrictions, new variants and reinfections are cited as potential driving factors

25 March 2021 - 19:59 By Benjamin Parkin, John Burn-Murdoch, Donato Paolo Mancini and Anna Gross

India is experiencing a sharp rise in coronavirus infections, increasing pressure on New Delhi to accelerate its vaccine rollout and puzzling scientists after a retreat of the pandemic had buoyed hopes that parts of the country had reached herd immunity.

The nation has reported more than 40,000 daily Covid-19 infections since Friday, up from lows of about 11,000 last month. On Thursday, India reported 53,000 new infections in the past 24 hours, the highest since October...

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