This was a Phase 2, randomized, placebo -controlled, participant and investigator blinded, multi-center study to assess efficacy and safety of MAS825 for the treatment of SARS-CoV-2 infected patients with COVID-19 pneumonia and impaired respiratory function.~The study consisted of five study periods:~Screening / Baseline / Treatment visit (Day -1 to 1): Lasted up to a maximum of 24 hours and comprised a screening / baseline assessment. This visit was used to confirm that the study inclusion and exclusion criteria were met and served as baseline assessment prior to randomization. Participants were randomized as soon as possible, but within a maximum of 24 hours after screening in a 1:1 ratio receiving a single intravenous infusion of MAS825 or placebo in addition to standard of care (SoC) on Day -1 to 1.~Treatment period (Day 2-15): Study assessments were conducted every 2 days for hospitalized participants. If participants were discharged from the hospital prior to Day 15, assessments on the day of discharge were performed according to the schedule listed under Day 15 and those participants returned to the site for the Day 15 assessment (all other visits between discharge and Day 15 were omitted).~Follow-up (Day 16-29): After completion of the treatment period, participants were observed until Day 29 or discharged from hospital, whichever was sooner. Study assessments were conducted every 2 days for domiciled participants. If participants were discharged from hospital prior to Day 29, a study visit conducted by telephone was performed on Day 29 (all other visits between discharge and Day 29 were omitted).~Safety follow-up visit assessment (Day 45): A follow-up visit for safety was conducted at Day 45 if the participant was hospitalized. If participants were discharged from the hospital prior to Day 45, a study visit was conducted by telephone on Day 45.~End of Study/Safety follow-up visit assessment (Day 127): A follow-up visit for safety was conducted at Day 127 if the participant was hospitalized. If participants were discharged from the hospital prior to Day 127, a study visit was conducted by telephone on Day 127.
This clinical study was designed to assess the efficacy and safety of MAS825 for the treatment of severe acute respiratory syndrome coronavirus 2 (SARS-Cov-2) infected patients with coronavirus disease 2019 (COVID-19) pneumonia and impaired respiratory function.