22- NCT043 48,435 A Randomized, Double-Blind, Placebo-Controlled Clinical Trial to Determine the Safety and Efficacy of Hope Biosciences Allogeneic Mesenchymal Stem Cell Therapy (HBadMSCs) to Provide Protection Against COVID19 II Enrolling by invitation 100 AD-MSCs DOS: April 2020 DOC: April 2021 Both Child, Adult, Older Adult United States