The ACTIV4A Inpatient study is testing if antithrombotic treatments – medications that reduce the creation of clots -- improve recovery from patients hospitalized due to COVID-19.

The C3PO study is testing if convalescent plasma -- the liquid portion of blood collected from patients who have recovered from COVID-19 – prevents mild infection, being treated at home, from worsening and requiring hospitalization.

The ACTIV4B Outpatient study is testing if anticoagulation agents – blood thinners -- prevent mild infection, being treated at home, from worsening and requiring hospitalization.