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Infectious Diseases

Nirsevimab Cuts RSV Lower Respiratory Infections in Infants Without Replacing Other Viruses: Post‑hoc Analysis of the Phase 3 MELODY Trial

MedXY Editorial TeamNov 10, 2025
infantsmonoclonal antibodynirsevimabRSV

Highlights

– In the MELODY phase 3 randomized trial, nirsevimab reduced RSV-associated medically attended lower respiratory tract infections (MA-LRTIs) and RSV coinfections in infants entering their first RSV season.
– No evidence was found for replacement of RSV infection by other respiratory viruses following nirsevimab immunization.
– Most RSV-associated LRTIs adjudicated in the trial were mild; hospitalization occurred in roughly one-quarter of single RSV infections.

Background: clinical context and unmet need

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This article was created using several editorial tools, including AI, as part of the process. Human editors reviewed this content before publication.

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