If so it is an flu shot pattern. Clinical flu/corona vaccination trials start traditionally in Wuhan, after that export, after that other chinese provinces.
https://www.deccanchronicle.com/world/asia/250320/over-5000-volunteers-in-wuhan-sign-up-for-clinical-trials-over-covid1.html
https://www.deccanchronicle.com/world/asia/250320/over-5000-volunteers-in-wuhan-sign-up-for-clinical-trials-over-covid1.html