You might want to research Antibody-Dependent Enhancement in relation to the mRNA Wuhan Virus vaccines. Numerous articles have been posted on FreeRepublic on this subject.
Each of them ridiculous fearmongering. 15 months in since the first clinical trials began and not a single sign of ADE anywhere in anyone. Hundreds of millions of shots given, not a single sliver of evidence for ADE.
If we were going to see ADE anywhere, it’d be with the nucleocapsid protein antibodies in those with previous infection. Those are the ones most likely to present sub-optimal binding across serotypes. Still no evidence of that either.