The Journal of infectious diseases · 2026
Avian Influenza Virus A(H5N1) Genotype D1.1 Is Better Adapted to Human Nasal and Airway Organoids Than Genotype B3.13.
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Zhang Xiaojuan, Lam Stephanie Joy-Ann, Chen Lin-Lei, Fong Carol Ho-Yan, Chan Wan-Mui, Ip Jonathan Daniel, Deng Shaofeng, Liu Siwen, Tam Rachel Chun-Yee, Wang Pui, Chan Kwok-Hung, Chan King-Pui Florence, Ho James Chung-Man, Zhou Jie, Yuen Kwok-Yung, Chen Honglin, To Kelvin Kai-Wang
Аннотация
Three critically ill or fatal avian influenza A(H5N1) human infections have been reported in North America since November 2024. Notably, all were infected with genotype D1.1 instead of B3.13, the dominant genotype before November 2024. Here, we demonstrated that D1.1 could replicate to higher titers in human nasal and airway organoid-derived transwell monolayers from 6 donors. D1.1 exhibited a better binding to α2,3- and α2,6-linked sialic acid than B3.13. No significant differences in most inflammatory or antiviral cytokines/chemokines were observed. These observations suggest that D1.1 is better adapted to both the upper and lower human respiratory tract epithelium than B3.13.