A study to investigate the safety, tolerability, and pharmacokinetics of the monoclonal antibody VYD222 in healthy adult participants.

This is a Phase I, first-in-human, randomized, triple blind, single escalating dose study to evaluate the safety and tolerability of VYD222, a monoclonal antibody targeting SARS-CoV-2, in healthy adult volunteers.

The primary objective is to evaluate the safety and tolerability of multiple dose levels of VYD222 after a single administration in healthy participants. The secondary objective is to evaluate the plasma pharmacokinetics and immunogenicity of VYD222 after administration in healthy participants.

Inclusion Criteria:

• Has a body mass index 18.5 to 32.0 kg/m2, inclusive.
• Negative for current SARS-CoV-2 infection by rapid antigen test on Day -1.
• Is seropositive to N and/or S SARS-CoV-2 antigens at Screening.
• For participants assigned female sex at birth: Is not of childbearing potential OR is of childbearing potential and practicing highly effective contraception.
• Is able and willing to provide written informed consent.
• NOTE: Other protocol defined inclusion/exclusion criteria apply

Exclusion Criteria:

• Intends to receive a COVID-19 vaccine/booster within 3 months of Day 1.
• Is pregnant, breastfeeding, or seeking pregnancy while on study.
• Has a history of a malignancy (or active malignancy), except for participants with basal cell carcinoma, squamous cell carcinoma, or carcinoma in situ of the cervix who have been treated and cured.
• Has had any symptoms of acute respiratory illness (e.g., cough, shortness of breath, sore throat, fatigue, loss of smell, fever), or other febrile illness within 2 weeks prior to dosing.
• Has evidence of active infection with HIV, HBV, or HCV.
• Has donated more than 500 mL of blood within 60 days before the scheduled dose of study drug.
• Had major surgery within 30 days prior to study drug dosing or planned surgeries within 12 months after planned study drug dosing.
• Received any investigational drug or biologic within 30 days or 5 half-lives (whichever is longer) prior to Screening or planned administration of any investigational drug or biologic during the study period.
• Received immunoglobulin or blood products within 6 months prior to Screening.
• Previously received a mAb within 6 months or 5 half-lives (whichever is longer) prior to Screening.
• NOTE: Other protocol defined inclusion/exclusion criteria apply