A Study to Evaluate the Safety, Tolerability, Pharmacokinetics, and Immunogenicity of Single Ascending Subcutaneous or Intravenous Doses of ABBV-701 in Healthy Adult Western and Asian Participants

* Body weight is ≥ 35 kg and BMI is ≥ 18.0 to ≤ 32.0 kg/m2 after rounding to the tenth's decimal. * A condition of general good health, based upon the results of a medical history, physical examination, vital signs, laboratory profile, and a 12-lead ECG * Part 2 and Part 4 only: For Japanese Participants: --Participant must be first or second-generation Japanese parentage (both parents of Japanese descent), residing outside of Japan. Participants must be in general good health and maintain a typical Japanese lifestyle, including consuming a typical Japanese diet. Han Chinese Participants: --Participant must be first or second-generation Han Chinese of full Chinese parentage (both parents of Han Chinese descent), residing outside of China. Participants must be in general good health and maintain a typical Chinese lifestyle, including consuming a typical Chinese diet.

* History of any clinically significant cardiovascular, respiratory (except mild asthma as a child), renal, endocrine, hepatic, gastrointestinal, hematologic, or psychiatric disease or disorder, or any uncontrolled medical illness. * History of any clinically significant sensitivity or allergy to any medication or food.