Many neighborhoods in China check health codes before letting people pass. Other checkpoints include public transportation, offices and other public facilities. (Picture: Handout)
From QR codes to social media, four ways China tracks Covid-19
ID and phone numbers are being scooped up in big data systems designed to help China track potential contact with coronavirus cases
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Surveillance
Many neighborhoods in China check health codes before letting people pass. Other checkpoints include public transportation, offices and other public facilities. (Picture: Handout)