Cases are soaring across China, with hospitals struggling and pharmacy shelves stripped bare in the wake of the government's sudden decision to lift years of lockdowns, quarantines and mass testing.The United States has warned the outbreak is now of concern to the rest of the world, given the potential for further mutations and the size of China's economy.In Chongqing -- a city of 30 million where authorities this week urged people with mild Covid symptoms to go to work -- one worker told AFP their crematorium had run out of space to keep bodies."The number of bodies picked up in recent days is many times more than previously," a staffer who did not give their name said."At present after being infected with the Omicron variant, the main cause of death remains underlying diseases," Wang Guiqiang of Peking University First Hospital told a press conference of the National Health Commission (NHC)."