None

None

• patients with known equine allergies - patients with past medical history of serum sickness - patients with more than 4 days of hospitalization before being randomized in study - patients who have received convalescent plasma or intravenous immunoglobulin (ivig) for covid-19 - pregnant or breastfeeding women - patients with chronic kidney disease under dialysis - patients under invasive mechanical ventilation and/or extracorporeal membrane oxygenation at the beginning of study - patients participating in another intervention clinical trial - patients who are immunocompromised or with another chronic condition, that is judged by medical staff, to be at higher risk of infection or complications from participating in study - patients who are judged by medical staff who are unlikely to survive at 48 hours

• patients with known equine allergies - patients with past medical history of serum sickness - patients with more than 4 days of hospitalization before being randomized in study - patients who have received convalescent plasma or intravenous immunoglobulin (ivig) for covid-19 - pregnant or breastfeeding women - patients with chronic kidney disease under dialysis - patients under invasive mechanical ventilation and/or extracorporeal membrane oxygenation at the beginning of study - patients participating in another intervention clinical trial - patients who are immunocompromised or with another chronic condition, that is judged by medical staff, to be at higher risk of infection or complications from participating in study - patients who are judged by medical staff who are unlikely to survive at 48 hours