There is a different aspect of reactogenicity between BNT162b2 and ChAdOx1 nCoV-19 vaccine. Both new platform vaccines were concerned if they would elicit more significant local or systemic reactogenicity compared to the conventional vaccines. Previous studies had reported that immune cells such as mast cells and macrophages are activated just after vaccination, and release proinflammatory cytokines such as interleukin (IL)-6 and tumor necrosis factor (TNF)-α. The post-vaccination kinetics of inflammatory cytokines would be variable by each vaccine platform, and might be associated with reactogenicity. It is an interesting issue to be investigated whether the reactogenicity following newly developed BNT162b2 and ChAdOx1 would be associated with immunogenicity and inflammatory response or not. To better clarify these uncertainties, we evaluated the change of antibody response between BNT162b2 and ChAdOx1 over three months post-vaccination, in relation to the kinetics of inflammatory cytokines and reactogenicity.
Analysis of humoral antibody and cytokine kinetics after vaccination with either BNT162b2 or ChAdOx1 nCoV-19 vaccine and factors influencing the vaccine immunogenicity