Exhibit 99.1 Vaxart Provides Business Update and Reports Full Year 2023 Financial Results Significant progress made in preparing for a Phase 2b study evaluating Vaxart’s oral pill XBB COVID-19 vaccine against an approved mRNA vaccine comparator Topline data from Phase 1 norovirus study in lactating mothers expected in mid-2024 Steven Lo appointed President, Chief Executive Officer and Board Member Conference call today at 4:30 p.m. ET SOUTH SAN FRANCISCO, Calif., March 14, 2024 — Vaxart, Inc. (Nasdaq: VXRT) ...