Evaluate the safety and tolerability of PE in patients with Post-Acute Covid-19 Syndrome (PCC) comparing to sham plasma exchange (placebo);Proportion of subjects with Grade 0, 1 o 2 functional disability assessed by the fatigue severity scale (FSS);Proportion of subjects with Grade 0, 1 o 2 functional disability assessed by the functional status scale (PCFS)

Evaluate the safety and tolerability of PE in patients with Post-Acute Covid-19 Syndrome (PCC) comparing to sham plasma exchange (placebo);Proportion of subjects with Grade 0, 1 o 2 functional disability assessed by the fatigue severity scale (FSS);Proportion of subjects with Grade 0, 1 o 2 functional disability assessed by the functional status scale (PCFS)