This could be considered misinformation because it is misinformation. We can in fact measure these things and the mRNA vaccines have been demonstrated to genera

This could be considered misinformation because it is misinformation. We can in fact measure these things and the mRNA vaccines have been demonstrated to generated a robust immune response including memory B cells: https://immunology.sciencemag.org/content/6/58/eabi6950 https://immunology.sciencemag.org/content/6/58/eabi6950 https://science.sciencemag.org/content/371/6529/eabf4063 https://science.sciencemag.org/content/371/6529/eabf4063