A Study to Evaluate the Effect of JNJ-53718678 on the Cardiac Repolarization Interval in Healthy Adult Participants

A Double-blind, Randomized, Placebo-controlled, 4-Period Cross-over Study to Evaluate the Effect of JNJ-53718678 on the Cardiac Repolarization Interval in Healthy Adult Subjects

The purpose of this study is to assess the effect of JNJ-53718678 on QT interval corrected for heart rate (QTc) changes using exposure response analysis in healthy adult participants (Part 2).

Inclusion Criteria:

• Participants must have a Body mass index (BMI) between 18 and 30 kilogram per square meter (kg/m^2) (inclusive), and body weight not less than (<) 50 kg at screening
• Participants must have a blood pressure between 90 and 140 millimeter of mercury (mmHg) systolic, inclusive, and no higher than 90 mmHg diastolic at screening
• Participants must have a 12-lead electrocardiogram (ECG) consistent with normal cardiac conduction and function at screening, including: a) Normal sinus rhythm (heart rate (HR) between 45 and 100 beats per minute (bpm), inclusive); b) QT interval corrected for HR according to Fridericia's formula (QTcF) between 350 milliseconds (ms) and 430 ms for male participants, and between 350 ms and 450 ms for female participants (inclusive); c) QRS interval of ECG <110 ms; d) PR interval of the ECG less-than or equal to (<=) 200 ms; e) Morphology consistent with healthy cardiac conduction and function
• A female participant must be of non-childbearing potential, defined as: a) Postmenopausal or b) Permanently sterile
• A female participant must have a negative serum beta-human chorionic gonadotropin (b-hCG) pregnancy test at screening and a negative urine pregnancy test (except if postmenopausal) on Day -1 (or Day -2 in the first treatment period in Part 2)

Exclusion Criteria:

• Participants has a history of current clinically significant medical illness or certain laboratory abnormalities at screening
• Participant has a history of hepatitis A virus immunoglobulin M (IgM) antibody, hepatitis B surface antigen (HBsAg), or hepatitis C virus (HCV) antibody positive, or other clinically active liver disease, or tests positive for hepatitis A virus IgM antibody, HBsAg or HCV antibody at screening
• Participants with unusual T wave morphology (such as bifid T wave) likely to interfere with QTc measurements
• Participants with a past history of heart arrhythmias or with a history of risk factors for Torsade de Pointes syndrome (for example, hypokalemia or family history of short/long QT syndrome, or sudden unexplained death at a young age [<=40 years], drowning or sudden infant death in a first degree relative [that is, sibling, offspring, or biological parent])
• Participants with any skin condition likely to interfere with ECG electrode placement or adhesion