2026-09-09 ワシントン大学セントルイス校
＜関連情報＞
- https://source.washu.edu/2026/09/nasal-spray-vaccine-protects-against-bird-flu-in-mice/
- https://www.nature.com/articles/s41541-026-01523-8
- https://medibio.tiisys.com/174102/
鼻腔内および筋肉内投与のH5-Matrix-Mナノ粒子ワクチンは、マウスにおいて高病原性H5N1インフルエンザウイルスに対する防御効果を示す Intranasal and intramuscular H5-Matrix-M nanoparticle vaccines protects against highly pathogenic H5N1 influenza virus in mice
Kelly Pyles,Tamarand L. Darling,Lin-Chen Huang,Mimi Guebre-Xabier,Melinda Hersey,Ann M. Greene,Nita Patel,Gale Smith & Adrianus C. M. Boon
npj Vaccines Published:10 July 2026
DOI:https://doi.org/10.1038/s41541-026-01523-8 Early provide
Abstract
The emergence of clade 2.3.4.4b highly pathogenic H5N1 influenza virus in dairy cows and transmission to humans has heightened public health concerns. In this work, we characterized the immunogenicity and efficacy of a Matrix-M®–adjuvanted nanoparticle protein vaccine containing recombinant H5 HA of A/American wigeon/South Carolina/22/000345-001/2021 virus (clade 2.3.4.4b, H5-MNP). In naïve mice, intranasal or intramuscular vaccination with H5-MNP induced robust H5 binding and virus neutralizing antibody responses and protected against a lethal H5N1 challenge (A/Michigan/90/2024, clade 2.3.4.4b). In mice primed with seasonal influenza vaccine, one dose of H5-MNP vaccine provided similar levels of protection, with fewer breakthrough infections detected in the upper airways of mice that received the H5-MNP intranasally compared to those that were immunized intramuscularly. This novel H5-MNP vaccine technology could potentially induce protective immunity against pandemic influenza viruses in individuals with pre-existing seasonal influenza HA immunity.
