Duration of Protection of Nirsevimab Against Hospitalisation for Respiratory Syncytial Virus Infection

NCT ID: NCT06993753

Last Updated: 2025-05-29

Study Results

Results pending

The study team has not published outcome measurements, participant flow, or safety data for this trial yet. Check back later for updates.

Basic Information

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Recruitment Status

ACTIVE_NOT_RECRUITING

Total Enrollment

4350 participants

Study Classification

OBSERVATIONAL

Study Start Date

2024-04-15

Study Completion Date

2027-03-31

Brief Summary

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Respiratory syncytial virus (RSV) is a leading cause of hospitalizations for acute lower respiratory tract infection (LRTI) in infants. In Australia approximately 1.5% of infants are hospitalized due to RSV, 80% of whom are born full-term and are otherwise healthy. Two randomized trials have used a seasonal implementation strategy to show nirsevimab, a long-acting monoclonal antibody, has sustained efficacy against RSV LRTI hospitalizations in the first 150-180 days after administration. Nirsevimab has been approved in many countries for the prevention of RSV-LRTI in neonates and infants. However, the protection offered by nirsevimab beyond 180 days remains unknown. Queensland is a large Australian state spanning the tropical and sub-tropical climate zones, where RSV circulates year-round. The Queensland government publicly funded nirsevimab for all infants at birth from 15 April 2024. The aim of this study is to estimate the duration of effectiveness of nirsevimab against RSV-related hospitalizations.

A case-control study will be conducted using routinely collected linked data. Cases will be children born in Queensland from 15 April 2024 to 14 April 2025 who are hospitalised with an RSV-related condition prior to 14 April 2026. Controls will be drawn from the set of infants who are admitted to the same hospital in a 5:1 ratio, and matched on age and sex using the Queensland Perinatal Data Collection. Nirsevimab receipt will be extracted from hospital's electronic medical records and linked to hospitalization data by the Queensland Health Data Linkage Unit. Duration of protection against RSV-related hospitalisation due to nirsevimab will be assessed using multivariable logistic regression model accounting for matching and adjusting for confounding variables.

This case-control study will determine the level and duration of protection offered by nirsevimab in a region with year-round RSV circulation and inform future prevention strategies. Interim analysis is expected to be available at the time of the conference, allowing for early dissemination of this first evidence about nirsevimab duration of protection beyond 180 days.

Funding: From Sanofi and AstraZeneca through a collaboration grant.

Detailed Description

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Conditions

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Respiratory Syncytial Viral (RSV) Infections

Study Design

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Observational Model Type

CASE_CONTROL

Study Time Perspective

RETROSPECTIVE

Study Groups

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RSV hospitalised infant

Description: Cases (RSV hospitalised infant) will be children born in Queensland from 15 April 2024 to 14 April 2025 who are hospitalised with a RSV-related condition prior to 14 April 2026. Nirsevimab receipt will be extracted from hospital's electronic medical records and linked to hospitalisation data by the Queensland Health Data Linkage Unit.

No interventions assigned to this group

Non-RSV hospitalised infant

Description: Controls (Non-RSV hospitalised infant) will be drawn from the set of infants who are admitted to the same hospital in a 5:1 ratio, and matched on age and sex using the Queensland Perinatal Data Collection. Nirsevimab receipt will be extracted from hospital's electronic medical records and linked to hospitalization data by the Queensland Health Data Linkage Unit.

No interventions assigned to this group

Eligibility Criteria

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Inclusion Criteria

Inclusion Criteria: Any infant born between 15 April 2024 and 30 April 2025 and hospitalized for any reason between 15 April 2024 and 30 April 2026.

Exclusion Criteria: Infants who admitted to hospitals with an elective admission. ((i.e. admissions that are planned ahead of time, such as scheduled surgeries or other pre-arranged medical procedures).
Maximum Eligible Age

1 Year

Eligible Sex

ALL

Accepts Healthy Volunteers

No

Sponsors

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Griffith University

OTHER

Sponsor Role lead

Responsible Party

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Asmaa El-Heneidy

Dr

Responsibility Role PRINCIPAL_INVESTIGATOR

Locations

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Griffith University

Gold Coast, Queensland, Australia

Site Status

Countries

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Australia

Other Identifiers

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VAS00012

Identifier Type: OTHER_GRANT

Identifier Source: secondary_id

2024/851

Identifier Type: -

Identifier Source: org_study_id

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