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

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