Agree to your point of negligent and serious public misinformation. The details of the comparison need to be stated fully: Small subset of patients in a non-randomized trial (Mayo clinic) who were under 80 years old, not on ventilators and received plasma was analyzed. In this small subset of patients, those contain low levels of virus-fighting antibodies had a 30-day mortality rate of 37% vs. 24% in those with high antibody levels, with absolute reduction of 13%, and relative reduction of 35% (per an agency spokeswoman stated in the article). The question would be then on the results from full set of patients. The cherry-picked analyses by FDA were not found anywhere in the preprint of non-peer reviewed Mayo report.