BEIJING (Reuters) - Dumpling delicacies stuffed with cardboard shreds and bogus rabies vaccines are the focus of the latest health scares in China, where an industrial solvent used in toothpaste was banned after a spate of global recalls.China has stepped up its battle against substandard and fake food and drugs, new examples of which are reported on an almost daily basis around the world, and this week executed a former drug and food safety chief for corruption.