Exhibit A

JOINT FILING AGREEMENT

The undersigned agree that this Schedule 13G Amendment No. 1 dated August 13, 2025 relating to the Common Stock, par value $0.00001 per share, of Aura Biosciences, Inc. shall be filed on behalf of the undersigned.

SUVRETTA CAPITAL MANAGEMENT, LLC

By: /s/ Andrew Nathanson

Name: Andrew Nathanson

Title:   General Counsel and Chief Compliance Officer

AVERILL MASTER FUND, LTD.

By: /s/ Andrew Nathanson

Name: Andrew Nathanson

Title:   Authorized Signatory

AARON COWEN

By: /s/ Aaron Cowen