Mass Balance Study of AT-527 in Healthy Adult Male Subjects (R07496998)

Inclusion Criteria: * Minimum body weight of 50 kg and body mass index (BMI) of 18-32 kg/m2 * No clinically significant diseases captured in the medical history or clinically significant findings at screening physical examination. * A non-vasectomized, male subject must agree to use a condom with spermicide or abstain from sexual intercourse during the study until 90 days after dosing. (No restrictions are required for a vasectomized male provided his vasectomy has been performed 4 months or more prior to dosing. A male who has been vasectomized less than 4 months prior to dosing must follow the same restrictions as a non-vasectomized male). * Willing to comply with the study requirements and to provide written informed consent Exclusion Criteria: * Infected with hepatitis B virus, hepatitis C virus, HIV or COVID-19 * Abuse of alcohol or drugs * Use of other investigational drugs within 28 days of dosing * Other clinically significant medical conditions or laboratory abnormalities