China might starting using coronavirus vaccines this year, even if trials haven't been completed

Various coronavirus vaccine development programs have advanced at a rapid pace, with several candidates proving that they're safe and effective in pre-clinical and clinical trials. Some drugs are already approaching the final phases of human trials and could be ready in the coming months, but others have run into an unexpected problem: Not enough sick people. China is considering using some of the vaccine candidates on specific groups of people by the end of the year, even if the final trials ha...