Safety and PK of Ceftibuten-ledaborbactam Etzadroxil Fixed-dose Combination

This is a Phase 1, open-label, three-part, study in approximately 96 healthy adult participants between 18 and 55 years of age (both inclusive) (16 participants in Part 1, 20 participants in Part 2 and , and approximately 60 participants in Part 3). The study will be conducted at one clinical site in the United States. Participants in Part 1 and Part 2 may be conducted in parallel. The duration of an individual participation will be approximately 46 days for Part 1 , 43 days for Part 2 and 83 days for Part 3. All participants in Parts I und 2 will be screened within 28 days prior to dosing. All participants in Part 3 will be screened within 33 days prior to dosing. They will be admitted to the clinical research unit (CRU) the day prior to dosing and will remain in the CRU until the end of the PK sample collection period. All participants will return to the clinic for follow-up assessments 7 days ± 1 day after the last dose of study intervention. Participants in Part 3 will also return to the clinic for follow-up assessments 28 days ± 2 days and 42 days ± 2 days after the last dose of study intervention.