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The Chinese city of Shenzhen said it would implement COVID-19 restrictions on Monday.
It comes as Chengdu eased its lockdown for its 21 million people, announcing extended curbs.
Across China, 65 million citizens in more than 30 cities have been subjected to strict measures, according to Chinese business magazine Caixin.
Shenzhen officials vowed to “mobilize all available resources, mobilize all forces and take all possible measures” to stop the outbreaks.
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The city of 18 million has announced a new round of testing, ranking areas according to risk of infection.
Some restrictions will be lifted in places with low transmission.
Chengdu said the southwestern city would maintain curbs, carrying out tests until Wednesday.
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In Xinjin District and Qionglai City, where the lockdown has been lifted, indoor dining will be banned while public activities will remain limited.
Schools remain closed with all classes online.
Chinese authorities discourage domestic travel during upcoming national holidays
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According to the National Health Commission, China recorded 1,552 new cases in the past 24 hours.
Reuters and The Associated Press contributed to this report.