Antigenic Matching of rHVT-H5 via CRISPR/Cas9 Confers Complete Protection Against Novel H5N1 Clade 2.3.4.4b in Chicken.

ABSTRACT: The widespread panzootic of clade 2.3.4.4b highly pathogenic avian influenza (HPAI) H5N1 necessitates the development of vaccine platforms capable of rapid adaptation to emerging antigenic variants. Although commercial recombinant turkey herpesvirus (rHVT) vaccines are available, they often utilize heterologous inserts that may fail to optimally limit viral shedding of novel field strains. Here, we report the rapid construction of a homologous rHVT-H5 vaccine expressing the hemagglutinin (HA) gene of a representative clade 2.3.4.4b isolate via CRISPR/Cas9-mediated non-homologous end joining (NHEJ). In vitro characterization confirmed stable HA surface expression and growth kinetics comparable to the parental virus. In specific-pathogen-free (SPF) chickens, rHVT-H5 elicited robust hemagglut

SUBMITTER: Kim SW 

PROVIDER: S-EPMC12944848 | biostudies-literature | 2026 Jan

REPOSITORIES: biostudies-literature