A Study of AK119 (Anti-CD73 Antibody), a Treatment for COVID-19, in Healthy Subjects

Inclusion Criteria: Subjects must meet ALL the following inclusion criteria (as applicable) to be eligible for participation in this study: * Adults between 18 and 55 years of age, inclusive, at screening. * Must have a calculated body mass index (BMI, weight \[kg\]/height \[m2\]) within 18.0 to 30.0 kg/m2 (inclusive) at screening, and a total body weight ≥50 kg for men or ≥45 kg for women at screening and Day -1 before randomization. * Must, in the opinion of the Investigator, be in good general health based upon medical history, physical examination (including vital signs), and 12-lead ECG; and clinical laboratory tests (up to 1 repeat permitted) must fall within the clinical laboratory"s reference normal ranges. Exclusion Criteria: Subjects who meet ANY of the following exclusion criteria will not be enrolled in this study * Have a history of latent or active granulomatous infection, including histoplasmosis, candidiasis, or coccidioidomycosis prior to screening, or a history of any other infectious disease within 4 weeks prior to screening that, in the opinion of the Investigator, affects the subject"s ability to participate in the study. * Have a history of multiple drug allergies or a known allergy or hypersensitivity to any biologic therapy at screening that is important in the opinion of the Investigator. * Have a known allergy or reaction to any component of the AK119 formulation. * Have any known malignancy or have a history of malignancy within the previous 5 years. * Have a 12-lead ECG demonstrating QTcF interval \> 450 msec for male subjects and \>470 msec for female subjects at screening and Day -1 from average of 3 ECGs obtained after 5 minutes of supine rest. * Blood pressure (BP) \>150 mmHg (systolic) or \> 95 mmHg (diastolic) at screening and Day -1, following at least 5 minutes of supine rest. * Have had a live vaccination within 12 weeks prior to the study dosing or intend to have a live vaccination during the course of the study or have participated in a vaccine clinical study within 12 weeks prior to the study dosing.