A Phase 2, Double-blind, Placebo-controlled Study to Evaluate the Antiviral Activity, Clinical Outcomes, Safety, Tolerability, and Pharmacokinetic/Pharmacodynamic Relationships of Different Doses of JNJ-53718678 in Children >=28 Days and <=3 Years of Age With Acute Respiratory Tract Infection Due to Respiratory Syncytial Virus Infection

CR108520

The purpose of this study is to evaluate the antiviral activity, clinical outcomes, safety, tolerability, and pharmacokinetic/pharmacodynamic relationships of different oral dose levels of JNJ-53718678 in children greater than or equal to 28 days and less than or equal to 3 years of age with respiratory syncytial virus (RSV) disease (hospitalized participants \[Cohort 1\] or outpatients \[Cohort 2\]).

2018-11-29

2022-04-18

2022-04-18

Terminated

Early phase I

246

Inclusion Criteria: * Informed consent form (ICF) must be given * Laboratory diagnosis of respiratory syncytial virus (RSV) infection * The participant has an acute respiratory illness * The time of onset of RSV symptoms to the anticipated time of randomization must be less than or equal to (\<=) 5 days * Except for the RSV-related illness, the Participant must be medically stable in case of allowed co-morbid conditions * The participant must have been assessed per local public health practice and considered not to have Severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) infection during this respiratory infection Exclusion Criteria: * The participant is less than (\<) 3 months postnatal age at screening and was born prematurely (i.e, \<37 weeks and 0 days of gestation) OR if the participant weighs \<2.4 kilogram (kg) or greater than (\>) 16.8 kg * Participant is considered by the investigator to be immunocompromised within the past 12 months * Participant unwilling or unable to undergo mid-turbinate nasal swab procedures * Participant is receiving chronic home oxygen therapy at screening * Participant has other clinically significant abnormal electrocardiogram (ECG) findings not consistent with the present risk factor for severe RSV disease (if applicable) in the study population, as judged by the investigator based on the machine read ECG results at screening * The participant has a QTcF interval greater than (\>)450 millisecond (ms) per the machine read (mean of triplicate) parameter result confirmed by repeat triplicate ECG recording during screening

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2023-09-21