Vaccine troubles

Earlier attempts at making vaccines for corona virusses seemed to have failed, since the vaccination made things worse uppon challenging:

https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3335060/?fbclid=IwAR3MwuDPVSxxNGjaCafSZAQQ0eHLj-bT258y7oJLJn54J8EBQ3egCHsuds0

Risk for ADE is significant, based on eperiences with earlier Corona-vaccines:

https://pubmed.ncbi.nlm.nih.gov/33113270/

For extra explanation on how the immunesystem can overreact to an infection:

https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7097326/