Beijing's zero-Covid strategy has come under strain since March as over 100,000 cases in Shanghai have seen its 25 million inhabitants locked down in phases, inciting complaints of food shortages and clashes with health workers – Copyright AFP Hector RETAMAL China blasted the United States for making “groundless accusations” about its Covid-19 policy, after surging cases in Shanghai prompted the American consulate to let some staff leave the locked-down megacity. Beijing’s zero-Covid strategy has come under strain since March as over 100,000 cases in Shanghai have seen its 25 million inhabitants locked down in phases, inciting complaints of food shortages…