See China's COVID-19 contact tracing system in action

Walk up to the store. Open an app on your phone. Scan a QR code outside the entrance. Wait for your temperature to be taken. Get the OK. Enter the store. Make your purchase. Leave the store. Open the app again. Scan another QR code. Head home. This is how contact tracing works in Wuhan, China.Newsletter sign-up: Get The COVID-19 Brief sent to your inboxThe system can be seen in action in a video posted to Twitter on Sunday by an anonymous British man living in Wuhan.Track & Trace! How do the