China has identified a pork knuckle imported from Germany as the trigger for a new corona case. State media reported that a worker in a cold store in the east Chinese city of Tianjin was infected. Tests then led to virus traces on the packaging of a frozen pork knuckle. This was first imported from Bremen to Tianjin and sent from there to the city of Dezhou. Eight people with whom the worker previously had close contacts were quarantined as a precaution, according to the state newspaper “Global Times”. China has already identified frozen food or its packaging imported from abroad as a source of infection.