“…Its applications in the treatment of various kinds of bacteria and virus infections are supported by solid experimental researches, meanwhile clinical trials are going through to further validate its safety and efficacy ( Al-Anazi and Al-Jasser, 2015 ; Marrazzo et al, 2019 ; Sleem and Saleh, 2020 ). Recently, the attention on mesenchymal stem cell (MSC) therapy rockets, with more than 50 clinical trials in progress to evaluate its application on COVID-19-associated acute respiratory distress syndrome (ARDS)/pneumonia ( Meng et al, 2020 ; Shetty et al, 2020 ). Other hot research fields include septic shock ( McIntyre et al, 2018 ; Schlosser et al, 2019 ; Laroye et al, 2020 ), human immunodeficiency virus infection ( Allam et al, 2013 ; Zhang et al, 2013 ), influenza-associated pneumonia ( Darwish et al, 2013 ), hepatitis B virus-induced liver failure/cirrhosis ( Peng et al, 2011 ; Kantarcioglu et al, 2015 ; Lin et al, 2017 ), mycobacterium tuberculosis-induced bone defects ( Zhang et al, 2021c ), and refractory cytomegalovirus infection ( Meisel et al, 2011 ).…”