Symptomatic improvement typically begins 2–4 weeks post-infusion and progresses over 8–12 weeks. Functional gains plateau by 5–6 months. Follow-up studies extending to 12–24 months show sustained benefit in approximately 60% of initial responders; others experience gradual symptom recurrence. Some patients require repeat treatment cycles; optimal re-dosing intervals remain unclear.
Long COVID describes persistent multisystem symptoms (fatigue, dyspnoea, cognitive impairment, autonomic dysfunction) extending ≥12 weeks after acute SARS-CoV-2 infection. Proposed mechanisms include persistent viral fragments in reservoir tissues, endothelial activation with microclot formation, dysregulated immune memory (skewed Th1/Th17 responses, reduced regulatory T cells), and mitochondrial dysfunction. Placental mesenchymal stem cells and exosomes address these pathways through endothelial repair, anti-inflammatory cytokine secretion, and metabolic rescue of dysfunctional immune cells. Eleven registered clinical trials and two actively recruiting protocols evaluate MSC and exosome infusions in long-COVID cohorts, predominantly focusing on severe functional impairment or cardiopulmonary involvement.
Am I a candidate? → · Long COVID: full overview → · Long COVID cost → · Cost →
Medically reviewed by StemCellAtlas’s editorial team with Dr Polina Krasenova (Haematologist · Clinical Haematology & Integrative Oncology · 15+ yrs cell therapy) of partner clinic Stem Plus (Sofia), against ISSCR, FDA & EMA guidance. Educational information, not medical advice; figures indicative.
StemCellAtlas is your guide to stem-cell therapy: what the evidence shows, which conditions are treated, and the real all-in cost by country — typically €3,000–8,000 with our partner Stem Plus (Sofia), Europe's lowest-cost EU destination, versus $15,000–35,000 in the US.
Get an honest assessment