Corrigendum to ‘Cross-protective efficacy of inactivated whole influenza vaccines against Korean Y280 and Y439 lineage H9N2 viruses in mice’ [Vaccine 39 (2021) 6213–6220](S0264410X2101207X)(10.1016/j.vaccine.2021.09.028)

The authors regret that an error occurred in Fig. 3B of their published article. Using horse RBCs, HI antibody titers were only detectable in the vac564-vaccinated group after the boosting vaccination and 14 dpi after homologous challenge (3.4 ± 1.1 log₂ and 5.6 ± 1.5 log₂, respectively). Using horse RBCs, HI antibody titers were not detectable in the primary vaccination (Fig. 3B). The correct version of the figure is now reproduced below. [Figure presented] Fig. 3. Antibody responses 2 weeks after the primary and boosting vaccinations and after viral challenge in mice. Hemagglutinin inhibition (HI) assays were performed against each challenge virus with 0.5% turkey RBCs (A) or 1% horse RBCs (B) using sera from mice collected 2 weeks after the primary and the boosting vaccinations, and 2 weeks post-infection. Black circles (●) and gray diamonds (♦) indicate HI titers with 0.5% turkey RBCs and 1% horse RBCs, respectively. Gray daggers (†) indicate that horse RBCs did not react with HS314 as antigen. Serum neutralization (SN) assays were performed against each homologous challenge virus with sera collected from mice after the primary and boosting vaccinations and post-infection (C). White circles (○) indicate SN titers. NT indicates that no test was performed due to the death of the mice by 2 weeks post-infection. The authors would like to apologise for any inconvenience caused.