A Study to Evaluate the Drug Levels, Absolute Bioavailability, Safety, Tolerability, and Immunogenicity of Single-Dose of BMS-986446 in Healthy Adults After Single-dose Administration, and Participants With Early Alzheimer's Disease After Multiple Dose Administration

For Parts A and B: Participants must not have a general history of any clinically significant gastrointestinal, renal, hepatic, broncho-pulmonary, neurological, psychiatric, cardiovascular, endocrinological, immune-mediated disorder, hematological, ongoing allergic disorder requiring treatment, metabolic disorder, cancer, or cirrhosis.

For Parts A and B: Participants must not have donated or lost 500 mL blood or more within 60 days prior to study intervention administration.

For Part C: Participants must not have a neurological condition that in the opinion of the investigator may be contributing to cognitive impairment aside from the AD diagnosis, including but not limited to: Parkinson's disease, vascular dementia, dementia with Lewy bodies, frontotemporal dementia, Huntington's disease, normal pressure hydrocephalus, brain tumor, progressive supranuclear palsy, seizure disorder, subdural hematoma, multiple sclerosis, long COVID, or baseline intellectual disability.

For Part C: Participants must not have any current primary psychiatric diagnosis (eg, major depression, schizoaffective disorder or bipolar disorder) other than AD or symptoms (eg, hallucination or delusions).