BEIJING - China is ready to begin human trials on an experimental SARS (news - web sites) vaccine, a government official said Monday, but the World Health Organization (news - web sites) cautioned that a safe and effective vaccine was likely still a long way off. "This vaccine will protect the body," Yin Hongzhang, head of China's State Food and Drug Administration (news - web sites)'s biological product section, told The Associated Press. "We cannot tell yet whether it will be successful in humans, but we can say it is effective in animals, especially monkeys." The agency is looking for...