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

Topic |   Surveillance
Many neighborhoods in China check health codes before letting people pass. Other checkpoints include public transportation, offices and other public facilities. (Picture: Handout)
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