Human placenta-derived mesenchymal stromal cells transfusion in a critically Ill infant diagnosed with Coronavirus Disease 2019 (COVID-19): A case report.

Coronavirus disease 2019 (COVID-19) is still an emergency in many countries. Herein, we report treatment with human placental-derived mesenchymal stromal cells transfusion (hPD-MSCT) in a critically ill infant diagnosed with COVID-19. A 28-day-old male infant with a history of pneumonia was referred to our center with decreased SpO2 (92%) and fever (38.5 °C). Real-time reverse transcription polymerase chain reaction (RT-PCR) and chest computed tomography (CT) confirmed COVID-19 infection. Considering the deteriorating clinical status of the patient despite the routine treatments (SpO2 82%), human placental derived mesenchymal stromal cells (hPD-MSCs) was transfused to him on day 9 and 11 (7 × 106 cells/session). The patient's general condition started to change 3 days after hPD-MSCT and poor feeding and low SpO2 improved day by day. On day 20, the patient was discharged (SpO2 97%) and our one-year follow-up showed a successful response to the treatment with no reported complications. hPD-MSCT may be considered as a possible treatment option in infants/children diagnosed with COVID-19 who fail to respond to conventional therapies. However, required dose, safety, and mechanistic studies are still warranted to further investigate this treatment.