Study of Efavaleukin Alfa in Healthy Chinese, Japanese, and Caucasian Participants

Inclusion Criteria: * Healthy male or female participants, between 18 and 55 years of age (inclusive) at the time of Screening. * Chinese, Japanese, or Caucasian participant: * Chinese participants must be of Chinese ancestry (4 grandparents and biological parents). * Japanese participants must be first- or second-generation Japanese (4 grandparents and biological parents; participant or both of their parents must have been born in Japan). * Caucasian participants are those who self-identify exclusively as such on the electronic case report form (eCRF) and also identify their biological parents as such. * In good health, determined by no clinically significant findings from medical history, physical examinations, 12-lead electrocardiogram (ECG), vital signs measurements, and clinical laboratory evaluations (congenital nonhemolytic hyperbilirubinemia \[eg, suspicion of Gilbert's syndrome based on total and direct bilirubin\] is not acceptable) as assessed by the Investigator (or designee). * Body mass index between 17 and 30 kg/m\^2 (inclusive) at the time of Screening. Exclusion Criteria: * Evidence of scars, tattoos, or other skin lesions that may interfere with the injection site or injection site assessments. * History or evidence of clinically significant arrhythmia at Screening, including any clinically significant findings on the ECG taken at Check-in. * A QT interval corrected for heart rate using Fridericia's method (QTcF) interval \> 450 msec in male participants or \> 470 msec in female participants or history/evidence of long QT syndrome, at Screening or Check-in. * PR interval \> 210 msec, at Screening or Check-in. * Second- or third-degree atrioventricular (AV) block , at Screening or Check-in. * Systolic blood pressure (BP) \> 140 mmHg or \< 90 mmHg, or diastolic BP \> 90 mmHg, or HR \> 100 bpm, at Screening or Check-in. * Estimated glomerular filtration rate less than 60 mL/min/1.73 m\^2 as calculated by the Modification of Diet in Renal Disease equation, at Screening. * HbA1C ≥ 7%, at Screening or Check-in. * Participants who have received live vaccines within 5 weeks prior to Screening, or plan to receive live vaccines within 105 days after administration of an investigational product. * Positive hepatitis B or hepatitis C panel (ie, positive hepatitis B surface antigen, hepatitis B core antibody or hepatitis C antibody) at Screening, or a medical history for hepatitis B or C; and/or positive human immunodeficiency virus test, at Screening. Participants whose results are compatible with prior vaccination may be included. Participants with a history of hepatitis B vaccination without a history of hepatitis B or C are allowed to participate. * Consumption of foods and beverages containing poppy seeds within 7 days prior to Check-in. * History of alcoholism or drug/chemical abuse within 1 year prior to Check-in. * Use of tobacco- or nicotine-containing products within 6 months prior to Check-in. * Positive test for illicit drugs, cotinine (tobacco or nicotine use), and/or alcohol use at Screening or Check-in. * Female participants with a positive pregnancy test at Screening or Check-in. * Participant has received a dose of an investigational drug within the past 90 days or 5 half-lives of the drug, whichever is longer, prior to Check-in. * Donation of blood from 90 days prior to Check-in, plasma from 2 weeks prior to Check-in, or platelets from 6 weeks prior to Check-in. * Participants with abnormal laboratory results for alanine aminotransferase (ALT) or aspartate aminotransferase (AST) (ie, \> upper limit of normal) and total bilirubin (ie, \> upper limit of normal) at Screening and Check-in.