The surface of this inactivated virus is dotted with dozens of antigens, or proteins. This explains why mRNA vaccine manufacturers don’t need Bio Safety Level 3 labs, as inactivated vaccine manufacturers do. It also explains why the risk of enhanced respiratory disease (ERD) is different for mRNA vaccines and inactivated vaccines. Adenovirus vector vaccines also use the genetic code of the spike antigen, but deploy it differently. But making such an adenovirus vector vaccine requires live adenovirus to be grown in large quantities first.

Source: Mint May 26, 2021 09:56 UTC