This statement as said is almost certainly false, it's too overly simplistic - half of what? Half of peak? Or do you mean only IgG but not IgM, etc? But, relat

This statement as said is almost certainly false, it's too overly simplistic - half of what? Half of peak? Or do you mean only IgG but not IgM, etc? But, related, and maybe what the professor was talking about: https://en.wikipedia.org/wiki/Antibody-dependent_enhancement https://en.wikipedia.org/wiki/Antibody-dependent_enhancement ^ This should be mandatory reading for anyone. Especially people that are obsessed with the idea that all vaccine candidates are inherently safe. (Unfortunately the term "anti-vaxxer" now gets thrown around for any actual legitimate discussion of the risks of untested vaccine candidates). I'd note that ADE literally happens in Coronaviruses, so it's extra relevant. It can even happen outside the context of a vaccine, and may play a role in the pathology of severe SARS-CoV-2 infection.