Vaxart, Inc. announced that the last subject has completed dosing in the Phase 2 clinical trial of its oral pill bivalent norovirus vaccine candidate. In addition, all patients have been challenged in its challenge study of its G.1.1 monovalent vaccine candidate. No vaccine related SAEs have been reported to date in either trial, consistent with the safety profile observed in all norovirus trials.

Vaxart continues to expect to report topline data from the ongoing Phase 2 dose-ranging study (NCT05626803) of its bivalent norovirus vaccine candidate in mid-2023. The primary endpoints are safety and immunogenicity, with the objective of determining dose levels for Phase 3 development. The Company also expects to report topline data from the ongoing Phase 2 challenge study (NCT05212168) of Vaxart's G1.1 monovalent norovirus vaccine candidate during Third Quarter 2023.

Primary endpoints include safety and reduction in acute gastroenteritis (AGE) caused by norovirus infection, while additional endpoints include reduction in AGE severity, reduction in shedding, and immunogenicity, with the objective of determining efficacy against norovirus G1.1-induced AGE.