Exhibit 99.1 Vaxart Provides Business Update and Reports First Quarter 2024 Financial Results Positive results from Phase 1 norovirus study in lactating mothers indicate the potential of Vaxart’s oral pill vaccine candidate to protect or reduce the effect of the disease in infants Expects to initiate Phase 2b study evaluating Vaxart’s oral pill XBB COVID-19 vaccine against an approved mRNA vaccine comparator as early as the second quarter of 2024 Anticipates meeting with the FDA in mid-2024 to evaluate clin ...