Q&A: COVID-19 booster shots

4. Which type of COVID-19 vaccines can be used as booster shot?

COVID-19 vaccines that can be used as a booster shot include the inactivated virus vaccines developed by Sinopharm's Beijing Institute of Biological Products, Sinopharm's Wuhan Institute of Biological Products or Sinovac Biotech, as well as the adenovirus vector vaccine developed by CanSino Biologics.

5. How does the COVID-19 booster shot work?

After a full vaccination, neutralizing antibodies will subside after a period of time. However, the body will have already produced corresponding memory-B cells.

When a booster shot is administered, it will induce memory-B cells to proliferate rapidly and produce antibodies so the human body can maintain high immunity again.