China announced plans to scrap its primary Covid tracking app in the latest rollback of pandemic control measures, just days after abruptly abandoning its long-running zero-Covid policy. It came as health authorities warned of widespread infections on the horizon, and redeployed hundreds of thousands of doctors and nurses to intensive care units in preparation for an Omicron surge through the population of 1.4 billion people. On Tuesday the government-run “communications itinerary card” will be retired, according to an official announcement on Monday. The app tracked people’s movements using mobile phone signals, identifying those who had been in high-risk areas in…