Evaluation of VX-828 in Healthy Participants and in Participants With Cystic Fibrosis

This clinical trial information was submitted voluntarily under the applicable law and, therefore, certain submission deadlines may not apply. (That is, clinical trial information for this applicable clinical trial was submitted under section 402(j)(4)(A) of the Public Health Service Act and 42 CFR 11.60 and is not subject to the deadlines established by sections 402(j)(2) and (3) of the Public Health Service Act or 42 CFR 11.24 and 11.44.).

Key Inclusion Criteria:

Parts A-D:

• Participants between the ages of 18 and 55 years
• Body mass index (BMI) of 18.0 to 32.0 kilogram per meter square (kg/m^2)
• A total body weight of more than (>) 50 kg
• Nonsmoker or ex-smoker for at least 3 months before screening with current nonsmoking status confirmed by urine or blood cotinine at screening
• Cohort C2 only: Willing to provide a single DNA sample

Part E:

• Participants 18 years or older
• Confirmed diagnosis of CF as determined by the investigator
• A total body weight of more than or equal to (>=) 35 kg
• Participants must be heterozygous for F508del with a second CFTR allele carrying a minimal function mutation that is not responsive to ELX/TEZ/IVA therapy
• Participants must have a forced expiratory volume in 1 second (FEV1) of greater than or equal to (≥) 40% of predicted normal for age, sex, and height

Key Exclusion Criteria:

Parts A-D:

• History of febrile illness or other acute illness within 14 days before the first dose of study drug
• Any condition possibly affecting drug absorption

Part E:

• An acute illness not related to CF (e.g., gastroenteritis) within 14 days before the first dose of study drug
• History of solid organ or hematological transplantation
• History of clinically significant cirrhosis with or without portal hypertension
• Lung infection with organisms associated with a more rapid decline in pulmonary status

Other protocol defined Inclusion/Exclusion criteria will apply.