Eligibility Criteria:
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):
1. Fever, chills or sweats (temperature of 38 °C / 100.4 °F or higher)
2. Difficulty breathing
3. Cough
4. Sore throat
5. New or recent loss of taste or smell
6. 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:
1. White blood cell count \< 3,000/mm3, hemoglobin \< 11g/dL
2. Absolute neutrophil count ≤ 2,000/mm3, platelet count \<120,000/mm3
3. 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