A Two-Part Infant Study for Early Diagnosis of Respiratory Syncytial Virus (RSV) and Evaluation of JNJ-53718678 in RSV Acute Respiratory Tract Disease

Janssen Research & Development, LLC22 enrolled

Overview

The purpose of this two-part designed study is to assess in the setting of a planned early interception of pediatric RSV disease, early viral and disease kinetics (observational stage) and the antiviral effects of an Respiratory Syncytial Virus (RSV) fusion inhibitor, JNJ-53718678 (interventional stage). In the observational stage the infant is closely monitored for early symptoms by the parent(s)/caregiver(s) and thus may be brought in for diagnosis earlier than in the typical setting.

Study Type

INTERVENTIONAL

Allocation

RANDOMIZED

Purpose

TREATMENT

Masking

DOUBLE

Enrollment

Conditions

Respiratory Syncytial Viruses

Interventions

RSV Mobile Application

Eligibility

Sex: ALLMin age: 28 DaysMax age: 4 Months

Medical Language ↔ Plain English

Inclusion Criteria: Part 1: Observational Stage * The infant is less than or equal to (\<=) 4 months of age at enrollment and asymptomatic for acute respiratory illness (ARI)-like symptoms requiring medical intervention at the time of consent to participate in the study * At least 1 parent/caregiver must be able to use the respiratory syncytial virus (RSV) mobile application (App) at home via his/her own Android/iOS electronic device (compatible with RSV mobile App) * 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 Part 2: Interventional Stage * The infant is 28 days and if prematurely born infant (that is \[i.e.\], less than \[\<\] 37 weeks and 0 days of gestation at birth) is at least 3 months postnatal age * The participant has been diagnosed with RSV infection using a rapid molecular-based diagnostic assay * The participant weighs more than 2.4 kilogram (kg) * The participant has an acute respiratory illness as evaluated by the investigator * 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 SARS-CoV-2 infection during this respiratory infection Exclusion Criteria: Part 1: Observational Stage * The participant has any physical abnormality which limits the ability to collect regular nasal specimens * The participant is receiving chronic home oxygen therapy at enrollment (applicable to both parts) Part 2: Interventional Stage * The participant is \<3 months postnatal age at screening and was born prematurely (i.e., \<37 weeks and 0 days of gestation) or if the participant weights \<2.4 kg * The participant has a QT interval with Fridericia's correction (QTcF) greater than (\>) 450 milliseconds per the machine read (mean of triplicate) parameter result confirmed by repeat triplicate Electrocardiogram (ECG) recording during screening * The participant is considered by the investigator to be immunocompromised, whether due to underlying medical condition or medical therapy * The participant has had any of: a) Confirmed SARS-CoV-2 infection (test positive) during the four weeks prior to randomization, or b) Close contact with a person with Coronavirus Disease 2019 (COVID-19) (test confirmed or suspected SARS-CoV-2 infection) within 14 days prior to randomization

Locations (10)

Instituto de Maternidad y Ginecología Nuestra Senora de las Mercedes

San Miguel de Tucumán, Argentina

UZ Antwerpen

Edegem, Belgium

Cevaxin 24 de diciembre

Panama City, Panama

Cevaxin Avenida Mexico

Panama City, Panama

Cevaxin La Chorrera

Republica de Panama, Panama

Hsinchu MacKay Memorial Hospital

Hsinchu, Taiwan

National Taiwan University Hospital

Taipei, Taiwan

Department of Pediatrics, MacKay Memorial Hospital

Taipei, Taiwan

Chang Gung Memorial Hospital- Linkou

Taoyuan District, Taiwan

St George's University Hospital NHS Foundation Trust

London, United Kingdom

Outcomes

Primary Outcomes

Respiratory Syncytial Virus (RSV) Viral Load-time Curve From Immediately Prior to First Dose of JNJ-53718678 Through Day 5 (AUC [Day 1-5])

RSV viral load AUC was determined from immediately prior to first dose of JNJ-53718678 through Day 5. The RSV viral load was measured by quantitative reverse transcription polymerase chain reaction (qRT-PCR) assay in mid-turbinate nasal swab specimens.

Time frame: Baseline (Day 1) up to Day 5

Secondary Outcomes

RSV Viral Load Over Time

RSV viral load actual values over time was measured by qRT-PCR in the nasal swab specimens collected at the clinic visits and at home.

Time frame: Baseline, Days 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 14, and 21

Change From Baseline in RSV Viral Load Over Time

Change from baseline in RSV viral load over time was measured by qRT-PCR in the nasal swab specimens collected at the clinic visits and at home.

Time frame: Baseline, Days 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 14, and 21

RSV Viral Load Area Under the Curve (AUC) From Immediately Prior to First Dose of Study Drug (Baseline) Through Days 3, 8, and 14

RSV viral load AUC was determined by qRT-PCR assay in mid-turbinate nasal swab specimens.

Time frame: Baseline through Days 3, 8, and 14

Time to Undetectable RSV Viral Load

Time to undetectable RSV viral load is defined as the time in hours from initiation of study treatment until the first post-baseline time point at which the virus is confirmed undetectable. A confirmed undetectable sample is defined as the first of at least two consecutive samples that are undetectable. The last obtained sample for a participant, if undetectable, is considered confirmed.

Time frame: Up to 21 days

Percentage of Participants With Undetectable RSV Viral Load at Each Time Point Throughout the Study

Percentage of participants with undetectable RSV viral load at each time point throughout the study were reported.

Time frame: Baseline, Days 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 14, 21

Severity of Signs and Symptoms of RSV Infection Assessed by Parent(s)/Caregiver(s) Pediatric RSV Electronic Severity and Outcome Rating System (PRESORS)

The severity of signs and symptoms of RSV infection (breathing problems, retractions, tachypnea, breathing sounds, cough, tachycardia, nasal secretions, sleep disturbance, crying, illness behavior, feeding problems, and dehydration) were assessed by the PRESORS. PRESORS is a questionnaire by parent(s)/caregiver(s) recording presence and severity of signs and symptoms of RSV disease. PRESORS score consisted of 12-items, each score ranges from 0 to 3. A summary score was derived (mean of the item scores) which also ranges from 0 to 3. The higher the score, the worse the symptom.

Time frame: Baseline, Days 3, 5, 8, 14, and 21

Change From Baseline in Parent(s)/Caregiver(s) PRESORS Scores

PRESORS is a questionnaire recording presence and severity of signs and symptoms of RSV disease. PRESORS score consisted of 12-items, each item score ranges from 0 to 3. A summary score was derived (mean of the item scores) which also ranges from 0 to 3. The higher the score, the worse the symptom.

Time frame: Baseline, Day 3, 5, 8, 14, 21

Change From Baseline in Clinician PRESORS Score

Change from baseline in clinician (for concepts: activity level, sleep disturbance, breathing problems, retractions, tachypnea, feeding problem, cough, nasal secretions, wheezing, dehydration) PRESORS scores was reported. PRESORS is a questionnaire recording presence and severity of signs and symptoms of RSV disease. PRESORS score consisted of 10-items, each item score ranges from 0 to 3. A summary score was derived (mean of the item scores) which also ranges from 0 to 3. The higher the score, the worse the symptom.

Time frame: Baseline, Day 3, 5, 8, 14, 21

Time to Resolution of RSV Symptoms

Time to resolution from first dose of study drug until the first time of resolution of all RSV Symptoms (breathing problems, retractions, tachypnea, breathing sounds, cough, tachycardia, nasal secretions, sleep disturbance, crying, illness behavior, feeding problems, and dehydration). Resolution occurs when all symptoms from the caregiver reported outcomes (ObsRO) are scored as none or mild (score of 0 or 1, respectively) for at least 24 hours.

Time frame: Up to 21 days

Time to Improvement on Overall Health

Time to improvement based on general questions on overall health was reported. Time from first dose of study drug until first time status of improvement of RSV symptoms reported as "very much improved" or "much improved" based on response to question 'Would you say the child's RSV symptoms have improved, are about the same or are worse than when the child entered the study'.

Time frame: Up to 21 days

Percentage of Participants With Worsening or Improvement of RSV Disease

Percentage of participants with worsening or improvement of RSV disease based on general questions on overall health was reported. Improvement is defined improvement of RSV symptoms reported as "very much improved" or "much improved" based on response to question 'Would you say the child's RSV symptoms have improved, are about the same or are worse than when the child entered the study'.

Time frame: On Days 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21

Time to Return to Pre-RSV Health as Rated by the Parent(s)/Caregiver(s)

Time to return to pre-RSV health as rated by the parent(s)/caregiver(s) was evaluated. It is the time from first dose of study drug until the time to return to pre-RSV disease level.

Time frame: Up to 21 days

Percentage of Participants Who Require (re)Hospitalization During Treatment and Follow-up

Percentage of participants who require (re)hospitalization during treatment and follow-up were reported.

Time frame: Up to Day 31

Percentage of Participants With Adverse Events as a Measure of Safety and Tolerability

An adverse event is any untoward medical event that occurs in a participant administered an investigational product, and it does not necessarily indicate only events with clear causal relationship with the relevant investigational product.

Time frame: Up to Day 31

Percentage of Participants With Abnormal Chemistry Laboratory Findings

Percentage of participants with abnormal chemistry laboratory findings (alanine aminotransferase \[ALT; Grade 1 and 4\], aspartate aminotransferase \[AST; Grade 1\], and Hyperkalemia \[Grade 1 and 2\]) were reported based on Division of Microbiology and Infectious Diseases (DMID) toxicity grading scale. DMID toxicity grades ranges from 1 to 4. Grade 1 = mild: transient or mild discomfort (\<48 hours); no medical intervention/therapy required. Grade 2 = moderate: mild to moderate limitation in activity - some assistance may be needed; no or minimal medical intervention/therapy required. Grade 3 = severe: marked limitation in activity, some assistance usually required; medical intervention/therapy required, hospitalizations possible. Grade 4 = life-threatening or death: Extreme limitation in activity, significant assistance required; significant medical intervention/therapy required, hospitalization or hospice care probable.

Time frame: Up to Day 31

Percentage of Participants With Abnormal Urinalysis Laboratory Findings

Percentage of participants with abnormal urinalysis (Hematuria- Grade 1) laboratory finding was reported based on DMID toxicity grading scale. DMID toxicity grades ranges from 1 to 4. Grade 1 = mild: transient or mild discomfort (\<48 hours); no medical intervention/therapy required. Grade 2 = moderate: mild to moderate limitation in activity - some assistance may be needed; no or minimal medical intervention/therapy required. Grade 3 = severe: marked limitation in activity, some assistance usually required; medical intervention/therapy required, hospitalizations possible. Grade 4 = life-threatening or death: Extreme limitation in activity, significant assistance required; significant medical intervention/therapy required, hospitalization or hospice care probable.

Time frame: Up to Day 31

Percentage of Participants With Abnormal Electrocardiograms (ECGs) Findings

Percentage of participants with abnormal ECGs findings were reported. Parameters for abnormal ECG findings were QT interval corrected for heart rate (QTc) according to Bazett's formula (QTcB) Interval (\[450 milliseconds {ms}, 480 ms\], \[480 ms, 500 ms\], and \[more than 500 ms\]), QTc according to Fridericia's formula (QTcF) Interval (\[450 ms, 480 ms\], \[480 ms, 500 ms\], and \[more than 500 ms\]), change from baseline for QTcB Interval (\[30; 60\] ms, and greater than \[\>\] 60 ms), and for QTcF Interval (\[30; 60\] ms, and \>60 ms).

Time frame: Up to Day 31

Percentage of Participants With Vital Sign Abnormalities

Percentage of participants with vital signs (systolic blood pressure \[SBP\], diastolic blood pressure \[DBP\], pulse rate, respiratory rate, body temperature and peripheral capillary oxygen saturation \[SpO2\]) abnormalities (abnormally low \[ABL\] and abnormally high \[ABH\]) were reported.

Time frame: Up to Day 31

Plasma Concentrations of JNJ-53718678

No data was collected for pharmacokinetic (PK) analysis due to small sample size. Hence, no results are reported.

Time frame: Day 1 and Day 3