* with suspected covid-19 but not confirmed by rt-pcr test * having a known history of any other pathology that could be confused with the diagnosis of long covid: multiple sclerosis, autoimmune disease (lupus and gougerot syndrome, inflammatory muscle disease, and myasthenia gravis), untreated hypothyroidism, major depression, use of narcotics regular. * unable to perform a cycle ergometer stress test * with innate or drug-induced coagulation disorders (oral or parenteral anticoagulation) * with contraindications to plasmapheresis such as: lack of peripheral venous access or unstable cardiac pathology * pregnant or breastfeeding woman

* with suspected covid-19 but not confirmed by rt-pcr test * having a known history of any other pathology that could be confused with the diagnosis of long covid: multiple sclerosis, autoimmune disease (lupus and gougerot syndrome, inflammatory muscle disease, and myasthenia gravis), untreated hypothyroidism, major depression, use of narcotics regular. * unable to perform a cycle ergometer stress test * with innate or drug-induced coagulation disorders (oral or parenteral anticoagulation) * with contraindications to plasmapheresis such as: lack of peripheral venous access or unstable cardiac pathology * pregnant or breastfeeding woman

with suspected covid-19 but not confirmed by rt-pcr test having a known history of any other pathology that could be confused with the diagnosis of long covid: multiple sclerosis, autoimmune disease (lupus and gougerot syndrome, inflammatory muscle disease, and myasthenia gravis), untreated hypothyroidism, major depression, use of narcotics regular. unable to perform a cycle ergometer stress test with innate or drug-induced coagulation disorders (oral or parenteral anticoagulation) with contraindications to plasmapheresis such as: lack of peripheral venous access or unstable cardiac pathology pregnant or breastfeeding woman

with suspected covid-19 but not confirmed by rt-pcr test having a known history of any other pathology that could be confused with the diagnosis of long covid: multiple sclerosis, autoimmune disease (lupus and gougerot syndrome, inflammatory muscle disease, and myasthenia gravis), untreated hypothyroidism, major depression, use of narcotics regular. unable to perform a cycle ergometer stress test with innate or drug-induced coagulation disorders (oral or parenteral anticoagulation) with contraindications to plasmapheresis such as: lack of peripheral venous access or unstable cardiac pathology pregnant or breastfeeding woman