ALT INVESTOR NOTICE: ROSEN, NATIONAL TRIAL COUNSEL, Encourages Altimmune, Inc. Investors to Secure Counsel Before Important Deadline in Securities Class Action – ALT NEW YORK, May 09, 2024 (GLOBE NEWSWIRE) -- WHY: Rosen Law Firm, a global investor rights law firm, announces the filing of a class action lawsuit on behalf of purchasers of securities of...