As the number of COVID-19 cases climbed in Beijing in recent days, officials identified more than 350,000 people who needed to be tested.
I was one of them.
After word first emerged of a cluster of cases at a sprawling wholesale market in the Chinese capital, I had gone to the area to take photographs. Although I never entered the Xinfadi market and only took photos from nearby streets, unknown to me, I had been flagged as a potential vector for the virus.
My phone rang on Wednesday afternoon. An official from my neighborhood’s community association informed me that I should shortly report to the gates of a nearby sports stadium to be bused to a coronavirus testing site.
The caller did not know my name, but they knew that someone associated with my cellphone number had been in the vicinity of the market. I may have been tracked through my cellphone. A Beijing city official said Wednesday that 355,000 people have been identifed for testing via big data, but he did not specify...
June 19