No date has been set for the successful development of a new coronavirus vaccine. Vaccine development is a very long process, and like new drug development and production, there is a fixed cycle for vaccine development. The development of a vaccine requires the design and determination of the active ingredients of the vaccine, such as inactivated or attenuated viruses, etc., followed by the establishment of the manufacturing process and quality control, etc. The vaccine then needs to complete a series of tests to obtain sufficient data to apply for approval and conduct clinical trials. This includes vaccine efficacy evaluation and safety evaluation in animal models. If the process goes smoothly, it will take at least 1 year or so. Then the vaccine has to be validated in humans and undergo phase I, II and III clinical trials before it can be approved, a process that often takes several years and requires a lot of time and expense. Therefore, it is difficult to develop and apply a new coronavirus vaccine to the current epidemic in a short period of time, but the current epidemic is very urgent and the development and approval process will certainly be greatly accelerated, potentially shortening the vaccine development cycle significantly. Content source: Dr. You Lai