In addition, to determine the therapeutic efficacy of the CP, the titer of neutralizing anti-SARS-CoV-2 antibodies (IgG) obtained from the CP of the fully recovered patients from COVID-19 is administered on days 1–7, 14, 21, 28, and 35 from the start of treatment in 60 patients (age: 18 years and older) with severe SARS-Cov-19 infection (Clinicaltrials.Gov, 2020r). Here, CP is linked to COVID-19.