China announced the tightening of travel measures for its citizens to combat the coronavirus. On Wednesday, China recorded the highest daily number of locally transmitted COVID-19 cases in six months, as a testing and contact tracing campaign revealed a series of infections with the Delta variant. Health authorities reported 71 locally transmitted cases, the highest since January 2021, as China faces its largest outbreak in months, conducting tests across entire cities and isolating millions of people. Official results from the testing indicated a low number of infections, despite the virus reaching dozens of major cities. In March, China launched a digital passport for its citizens, allowing them to prove their health status while traveling to and from abroad. This digital certificate, which shows whether the holder has been vaccinated and includes COVID-19 test results, is available to Chinese citizens through an app on the Chinese social media platform WeChat.