Convalescent Plasma Antibody Levels and the Risk of Death from Covid-19 – nejm.org

Patients
The cohort consisted of 3082 patients from 680 acute care facilities across the United States (Figure 1). Table 1 shows key characteristics of the patients, stratified into three groups according to antiSARS-CoV-2 IgG antibody levels (based on signal-to-cutoff ratios). Overall, 61% of the patients were men, 23% were Black, 37% were Hispanic, 69% were younger than 70 years of age, and two thirds had received transfusions before invasive mechanical ventilation. The median number of patients…

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