Power of Attorney for Christophe Arbet-Engels at Altimmune, Inc.

Christophe Arbet-Engels, Chief Medical Officer of Altimmune, Inc., has executed a Power of Attorney appointing Vipin K. Garg and Gregory Weaver as his attorneys-in-fact. This authorization allows them to act on his behalf in matters related to SEC filings, including Forms 3, 4, and 5, Schedule 13D, Schedule 13G, and any amendments thereto. The Power of Attorney also permits them to perform any necessary actions to complete and file these forms with the SEC and any relevant stock exchanges. The authorization remains in effect until Arbet-Engels is no longer required to file these forms or until it is revoked in writing. The document was executed on October 1, 2025.