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Shanghai reported a record number of symptomatic COVID-19 cases on Saturday and other areas across China tightened controls as the country kept up its "dynamic clearance" approach that aims to stamp out the highly transmissible Omicron variant.

The Zhengzhou Airport Economic Zone, a central Chinese manufacturing area that includes Apple Inc supplier Foxconn, announced a 14-day lockdown on Friday "to be adjusted according to the epidemic situation".

In northwestern China, the city of Xian on Friday urged residents to avoid unnecessary trips outside their residential compounds and encouraged companies to have employees work from home or live at their workplace, following dozens of COVID-19 infections this month. read more

A Xian government official, responding to residents' concerns over potential food shortages, said on Saturday that the announcement did not constitute a lockdown and that the city would not impose one.

The city of Suzhou, near Shanghai, said on Saturday that all employees capable of working from home must do so, and residential compounds and company campuses should avoid unnecessary entry of people and vehicles. It has reported more than 500 infections in its latest outbreak.

Shanghai itself, which is at the centre of China's recent COVID surge starting in early March, on Saturday reported a record 3,590 symptomatic cases for April 15, as well as 19,923 asymptomatic cases. The asymptomatic case number was up slightly from 19,872 cases a day earlier.

The city's case tally makes up the vast majority of cases nationwide even as most of its 25 million residents remain under lockdown.

China's "dynamic clearance" policy aims to quickly contain sporadic outbreaks as they occur. On Saturday, a commentary in the Communist Party's official People's Daily newspaper said that the approach was the "best choice at this stage based on China's current epidemic situation."

But ongoing restrictions prompted Japan's consul general in Shanghai to call for the local government to address concerns of Japanese businesses, in a letter posted on the consulate's website on Saturday.

Domestic support for a zero-COVID policy has worn thin in recent weeks as virus-related restrictions have triggered food shortages, family separations, lost wages and economic pain.

SUPPLY CHAIN DISRUPTIONS

Analysts say broad supply chain disruptions are likely to lead to delays in shipments from companies including Apple, and to weigh on the country's economic growth rate this year. 

China's central bank on Friday evening cut the amount of cash that banks must hold as reserves, aiming to cushion a sharp slowdown in growth, though the cut was smaller than had been widely expected.