Study to Learn About a Respiratory Syncytial Virus Vaccine in Children at High Risk of RSV Disease

Trial statusNot yet recruiting
Trial phasePhase 3
Trial typeInterventional
Biological sexAll
Age5-17
SponsorPfizer

About this trial

The purpose of the study is to evaluate the safety, tolerability, and immunogenicity of RSVpreF in children 5 to \<18 years of age at high risk for RSV disease, including those who are immunocompromised.

Eligibility criteria

This trial accepts healthy volunteers

Qualifiers

Participants' age requirements for each study cohort at enrollment, respectively Cohort 1a (chronic medical conditions) 12 to <18 years of age Cohort 1b (chronic medical conditions) 5 to <12 years of age Cohort 2a (immunocompromising conditions) 12 to <18 years of age Cohort 2b (immunocompromising conditions) 5 to <12 years of age

Cystic fibrosis

Medically treated asthma

Other chronic respiratory diseases and malformations of the lung

Disqualifiers

Applicable to Cohort 1 (a and b) participants only: Immunocompromised individuals with known or suspected immunodeficiency, as determined by history and/or laboratory/physical examination

Applicable to Cohort 1 (a and b) participants only: Individuals with a history of autoimmune disease, past or present, requiring therapeutic intervention including, but not limited to, systemic lupus erythematosus. Note: Stable type 1 diabetes and hypothyroidism are permitted

History of severe adverse reaction associated with a vaccine and/or severe allergic reaction (eg, anaphylaxis) to any component of the study intervention(s)

Bleeding diathesis or condition associated with prolonged bleeding that would, in the opinion of the investigator, contraindicate intramuscular injection

Trial design

Design model

Parallel

Treatments tested in this trial

  • RSVpreF

    Biological/Vaccine

    RSVpreF Vaccine

  • Placebo

    Biological/Vaccine

    Placebo

Treatment groups

920 Participants
are divided into 4 treatment groups
Group A: Cohort 1: RSVpreFExperimental treatment 1 intervention
Group B: Cohort 1: PlaceboPlacebo comparator 1 intervention
Group C: Cohort 2: RSVpreF/RSVpreFExperimental treatment 1 intervention
Group D: Cohort 2: RSVpreF/PlaceboExperimental treatment 2 interventions

Trial outcomes

Primary outcomes

1

Cohort 1: Proportion of participants reporting pre-specified local reactions within 7 days following investigational product administration

Describe pre-specified local reactions in children 5 to \<18 years of age with chronic medical conditions

Time frame
Within 7 days
2

Cohort 2: Proportion of participants reporting pre-specified local reactions within 7 days following each investigational product administration

Describe pre-specified local reactions in children 5 to \<18 years of age with immunocompromising conditions

Time frame
Within 7 days
3

Cohort 1: Proportion of participants reporting pre-specified systemic events within 7 days following investigational product administration

Describe pre-specified systemic events in children 5 to \<18 years of age with chronic medical conditions

Time frame
Within 7 days
4

Cohort 2: Proportion of participants reporting pre-specified systemic events within 7 days following each investigational product administration

Describe pre-specified systemic events in children 5 to \<18 years of age with immunocompromising conditions

Time frame
Within 7 days

Secondary outcomes

1

Cohort 1: NTs for RSV A and RSV B expressed as Geometric Mean Titers (GMT)

Describe the immune responses elicited by RSVpreF in children 5 to \<18 years of age with chronic medical conditions

Time frame
Before vaccination, 1 month after vaccination, 12 months after vaccination, 24 months after vaccination
2

Cohort 1: NTs for RSV A and RSV B expressed as GMFR

Describe the immune responses elicited by RSVpreF in children 5 to \<18 years of age with chronic medical conditions

Time frame
1 month after vaccination, 12 months after vaccination, 24 months after vaccination
3

Cohort 1: NTs for RSV A and RSV B expressed as seroresponse rate

Describe the immune responses elicited by RSVpreF in children 5 to \<18 years of age with chronic medical conditions. Seroresponse is defined as a postvaccination NT ≥4 times the lower limit of quantitation (LLOQ) if the prevaccination titer is below the LLOQ; or a ≥4-fold rise from prevaccination if the prevaccination titer is ≥ LLOQ

Time frame
1 month after vaccination, 12 months after vaccination, 24 months after vaccination

Other outcomes

Sponsors and contacts

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