Study to Evaluate a Single Intranasal Dose of STI-2099 (COVI-DROPS™) in Outpatient Adults With COVID-19 (UK)

Inclusion Criteria: * Positive for COVID-19 with any locally approved RT-PCR within 7 days of planned treatment. * Either have no COVID-19 symptoms (asymptomatic) or mild illness/symptoms * Must be willing and able to comply with all planned study procedures and be available for all in-person and telephonic study visits and follow-up as required per protocol * Subject must have provided written informed consent * Willing to follow contraception guidelines Exclusion Criteria: * Moderate or severe illness/symptoms or rapidly progressive symptoms which are likely to progress such that a hospitalization is imminent (within 24-48 hours) * Any medical condition that, in the Investigator's opinion, could adversely impact subject safety or key objectives of the study, including any intranasal pathology, or clinically significant laboratory abnormalities, or active clinical disease process * Documented acute infection other thand COVID-19 * Pregnant or lactating women who are breast feeding or planning to during the study * Has participated, or is participating, in a clinical research study evaluating COVID-19 convalescent plasma, mAbs against SARS-CoV-2, or intravenous immunoglobulin (IVIG) within 3 months or less than 5 half-lives of the investigational product (whichever is longer) prior to the screening visit