The Chinese metropolis of 13 million, Xi’an, has been in lockdown for two weeks. Authorities have registered around 1,800 corona cases in the big city in central China since the outbreak in mid-December, which is considered to be one of the largest in China since the original one in Wuhan two years ago. A local failure of the app-based system for the “Covid-19 health code”, which strictly regulates the movements of people in China, has now made the situation of the residents of Xi’an worse. The citizens trapped in the city are actually only allowed outside for testing purposes and...