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Shanghai tightens lockdown again as it struggles to combat COVID

Daily PCR testing required for e-commerce delivery workers in hot spots

 A medical worker in Shanghai collects a swab from a resident for testing on April 22. The city's PCR testing system will be strengthened in areas facing serious infections. ( cnsphoto via Reuters)

SHANGHAI -- Shanghai, which has been on COVID-19 lockdown, is tightening its restrictions such as curfew once again as infections remain high.

China's most populous city had said it would ease curfew curbs in areas where new infections are low, but it has partially reversed the plan, requiring mandatory PCR testing in areas with high infection rates.

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