Inclusion Criteria:  Non-smoker for at least 12 months prior to screening for the study BMI ≥ 18.5 and ≤ 32 (kg/m2) and weight between 55.0 and 100.0 kg (both inclusive) Medically healthy without clinically significant abnormalities as assessed by the Investigator based on screening medical history, physical examination, vital signs, 12-lead ECG, hematology, biochemistry, coagulation, and urinalysis Forced expiratory volume in 1 second (FEV1) of at least 80% of predicted value at screening Ability and willingness to abstain from alcohol, caffeine, xanthine-containing beverages or food from 48 hours prior to study drug administration until discharge from the clinical unit If male, must agree to use a condom and have a non-pregnant female partner of childbearing potential agree to use a highly effective method of contraception If female, must be of non-childbearing potential or, if female of childbearing potential, a willingness to abstain from sexual activity or agree to use a high effective method of contraception that could lead to pregnancy Other inclusion criteria per protocol  Exclusion Criteria:  History or presence of significant oncologic, cardiovascular, pulmonary, hepatic, renal, hematological, gastrointestinal, endocrine, immunologic, dermatologic, vascular or neurological disease, including any acute illness or surgery within the past 3 months determined by the Investigator to be clinically relevant Recent history (within 6 months) of known or suspected Clostridium difficile infection History of seizure disorders Positive urine drug, alcohol or cotinine testing at screening or check-in (Day -1) Positive testing for human immunodeficiency virus (HIV), hepatitis B surface antigen (HBsAg) or hepatitis C antibodies (HCV Ab) Positive testing for severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) at screening or prior to first dosing  Presence of the following symptoms at screening or within 28 days prior to screening or check-in (Day -1):  Fever, chills or sweats (temperature of 38 °C / 100.4 °F or higher) Difficulty breathing Cough Sore throat New or recent loss of taste or smell Nausea, vomiting or diarrhea Close contact with anyone who tested positive for SARS-CoV-2 infection within 28 days prior to screening or check-in (Day -1) Electrocardiogram (ECG) with QTcF interval duration equal or greater than 450 msec for males and 470 msec for females  Subjects who have any of the following abnormalities on laboratory values at screening or Check-In including:  White blood cell count < 3,000/mm3, hemoglobin < 11g/dL Absolute neutrophil count ≤ 2,000/mm3, platelet count <120,000/mm3 alanine aminotransferase (ALT) OR aspartate aminotransferase (AST) greater than the upper limit of normal (ULN) for the reference laboratory History of substance abuse or alcohol abuse Use of prescription medicine & tobacco/nicotine or marijuana-containing products A female who is pregnant or breastfeeding Other exclusion criteria per protocol