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Nirsevimab

Phase 3

RSV Immunization | Monoclonal antibody | Infectious Disease |Sanofi|Last Updated: Oct 9, 2025

Success Probability
Approval Probability 71%
TA Base Rate26%
Adjusted LOA41%
ML RiskLOW_RISK
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Market & Valuation
rNPV $3.2B
Market Size $9.4B
Revenue Basis $1.6B
Competitors 6
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Trial Design
RandomizedNO_TREATMENT_CONTROLLEDBiomarker
Total Trials1
Total Enrollment8,057
FDA Designations
No designations recorded
Clinical Trials (1)
NCT IDTitlePhaseStatusEnrollmentVelocityDesignStartCompletionLast UpdatedSitesCountries
NCT05437510Study of a Single Intramuscular Dose of Nirsevimab in the Prevention of Hospitalizations Due to Respiratory Syncytial Virus (RSV) Infection in Healthy Term and Preterm Infants During the First Year of LifePHASE3 COMPLETED 8,057Aug 8, 2022Apr 9, 2025Oct 9, 2025240 France, Germany +1
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Study Endpoints
Primary Endpoints
Number of Participants With Respiratory Syncytial Virus (RSV) Lower Respiratory Tract Infection (LRTI) Hospitalization Through the Respiratory Syncytial Virus Season
From dosing/randomization (Day 1) up to approximately 7 months

LRTI included the following common symptoms: clinical finding of rhonchi, rales, crackles, or wheeze; increased respiratory rate at rest (age: \<2 months, ≥60 breaths per minute (/min); 2 to 6 months, ≥50 breaths/min; \>6 months, ≥40 breaths/min), and hypoxemia (in room air: oxygen saturation \<95%). Hospitalization was defined as the decision to admit to in-patient care by the treating physician. RSV season was the period of increased RSV infection.

Secondary Endpoints
Number of Participants With Very Severe Respiratory Syncytial Virus Lower Respiratory Tract Infection Through the Respiratory Syncytial Virus Season
From dosing/randomization (Day 1) up to approximately 7 months
Number of Participants With Respiratory Syncytial Virus Lower Respiratory Tract Infection Hospitalization Through the Respiratory Syncytial Virus Season in Each Country
From dosing/randomization (Day 1) up to approximately 7 months
Number of Participants With Hospitalization for All-Cause Lower Respiratory Tract Infection Through the Respiratory Syncytial Virus Season
From dosing/randomization (Day 1) up to approximately 7 months
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Study Design & Arms
AllocationRANDOMIZED
MaskingNONE
ModelPARALLEL
PurposePREVENTION
Treatment Arms
ArmTypeDescription
NirsevimabEXPERIMENTAL1 intramuscular injection at Day 01
No preventive intervention for RSVNO_INTERVENTIONNo intervention
Interventions
NameTypeDescription
NirsevimabBIOLOGICALPharmaceutical Form: Solution for Injection Route of Administration: Intramuscular
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Eligibility Criteria
Age Range0 Days — 12 Months
SexALL
Healthy VolunteersYes
Study Sites240

Inclusion Criteria: * Born at ≥ 29 weeks gestational age and aged 0 to 12 months (calendar age), who entered their first RSV season on the day of inclusion in the study (D01) * Informed consent form was signed and dated by the parent(s) or other LAR(s) (and by an independent witness if required by ...

Countries:FranceGermanyUnited Kingdom
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