China on Thursday reported a record number of daily Covid infections, as a nationwide surge in cases heaps pressure on the country’s increasingly unpopular zero-tolerance approach to the virus.

The National Health Commission (NHC) recorded 31,444 locally transmitted cases on Wednesday – surpassing the previous peak of 29,317 recorded April 13 during Shanghai’s months-long lockdown.

The surge is being fueled by outbreaks in multiple cities and comes despite a refusal by authorities to end tight infection controls even in the face of an increasing – and unprecedented – backlash against their hardline approach of incessant lockdowns, quarantines and mass testing mandates. 

On Thursday, city officials said they were converting a major exhibition center into a makeshift hospital for the quarantine and treatment of Covid patients.

That was just the latest sign of the capital ratcheting up Covid controls. Earlier this week, schools in several districts moved classes online while Chaoyang – epicenter of the city’s outbreak and home to many international businesses and embassies – urged residents to stay at home and shuttered restaurants, gyms and beauty salons.

CNN