BEIJING : China National Biotec Group (CNBG) said on Sunday that early human test results for a coronavirus vaccine candidate suggested it could be safe and effective, the second vaccine candidate from the firm to show encouraging results in a clinical trial.The experimental shot, developed by a Beijing-based unit of CNBG, has induced high-level antibodies in all the inoculated participants in a Phase 1/2 clinical trial involving 1,120 healthy people, according to preliminary data of the trial, CNBG said in a posting on the social media platform WeChat, without disclosing specific readings.Chinese companies and researchers have been allowed to test eight vaccine candidates in humans at home and abroad, making China a major front-runner in.