Recently, the mainland began to deploy
The sequence of COVID-19 vaccines strengthens immunization
What is sequential immunity?
Is it a sequential immunization to play vaccines from different manufacturers?
A third booster injection has been given
Is sequential immunization still needed?
More content, a picture to understand
Source: CCTV News (ID: cctvnewscenter)
EDIT: Mo Shuo
Review: Jiajia Zhou