Mutational constraints on RSV F and its neutralization by antibodies.

Mutations in RSV F protein influence antibody neutralization, with resistance mutations emerging sporadically but remaining rare in circulating strains.

• Why it matters: Understanding how viral mutations impact antibody effectiveness is crucial for developing durable treatments and preventing resistance-related failures in RSV therapies.
• What they did: The study used biophysical modeling and pseudovirus deep mutational scanning to assess nearly all F protein mutations, measuring their effects on virus entry and neutralization by multiple antibodies.
• The result: Findings reveal that resistance arises sporadically and are currently rare, providing a framework for real-time resistance monitoring and guiding the design of more resilient future antibodies.