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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) NAOKI MATSUDA, Nikkei staff writer April 22, 2022 18:50 JST | China Copy Copied SHANGHAI -- Shanghai, which has been on COVID-19 lockdown, is tightening its restrictions such as curfew once again as infections remain high. Read Next
