Overview

The purpose of this study is to measure how well LY3819253 works against the virus that causes COVID-19. LY3819253 will be given to participants with early symptoms of COVID-19, via an injection into a vein. Samples will be taken from the back of the nose to determine how much virus is in the body at various times during the study. Participation could last about 12 weeks and includes one required visit to the study site, with the remainder of assessments performed in the home or by phone.

Eligibility

Inclusion Criteria:

• Are currently not hospitalized
• Have one or more mild or moderate COVID-19 symptoms: Fever, cough, sore throat, malaise, headache, muscle pain, gastrointestinal symptoms, or shortness of breath with exertion
• Must have sample taken for test confirming viral infection no more than 3 days prior to starting the drug infusion
• Are men or non-pregnant women who agree to contraceptive requirements
• Understand and agree to comply with planned study procedures
• Agree to the collection of nasopharyngeal swabs and venous blood
• The participant or legally authorized representative give signed informed consent

Exclusion Criteria:

• Have oxygen saturation (SpO2) less than or equal to ()93 percent (%) on room air at sea level or ratio of arterial oxygen partial pressure (PaO2 in millimeters of mercury) to fractional inspired oxygen (FiO2) less than (<)300, respiratory rate greater than or equal to ()30 per minute, heart rate 125 per minute
• Require mechanical ventilation or anticipated impending need for mechanical ventilation
• Have known allergies to any of the components used in the formulation of the interventions
• Have hemodynamic instability requiring use of pressors within 24 hours of randomization
• Suspected or proven serious, active bacterial, fungal, viral, or other infection (besides COVID-19) that in the opinion of the investigator could constitute a risk when taking intervention
• Have any co-morbidity requiring surgery within <7 days, or that is considered life-threatening within 29 days
• Have any serious concomitant systemic disease, condition or disorder that, in the opinion of the investigator, should preclude participation in this study
• Have a history of a positive SARS-CoV-2 test prior to the one serving as eligibility for this study
• Have received an investigational intervention for SARS-CoV-2 prophylaxis within 30 days before dosing
• Have received treatment with a SARS-CoV-2 specific monoclonal antibody
• Have a history of convalescent COVID-19 plasma treatment
• Have participated in a previous SARS-CoV-2 vaccine study
• Have participated, within the last 30 days, in a clinical study involving an investigational intervention. If the previous investigational intervention has a long half-life, 5 half-lives or 30 days, whichever is longer, should have passed
• Are concurrently enrolled in any other type of medical research judged not to be scientifically or medically compatible with this study
• Are pregnant or breast feeding