This is a randomized, double-blind, placebo-controlled, single ascending dose, single site, interventional study. There will be 5 single ascending dose (SAD) IV cohorts and 1 SC cohort. Nine participants will be enrolled into each of 5 IV cohorts and 1 SC cohort and participants will be randomized at a ratio of 2:1 to receive JNJ-61178104 or placebo. The total duration of participants participation will be approximately 21 weeks including a Screening Visit up to 4 weeks prior to study drug administration. Participants will have an inpatient period consisting of 6 days/5 nights and will return to the study-site at Weeks 2, 3, 4, 5, 7, 9, 13, and 17. Participants will be evaluated for safety throughout the study.
The purpose of this study is to assess the safety, tolerability, pharmacokinetics (PK) and immunogenicity of JNJ-61178104 following a single ascending Intravenous (IV) dose administration and a single Subcutaneous (SC) dose administration in healthy participants.