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• W4221036299 abstract "Avian influenza viruses (AIVs) and especially highly pathogenic (HP) AIVs of the H5 and H7 subtypes are of both veterinary and public health concern worldwide. In response to the demand for effective vaccines against H5N1 HPAIVs, we produced recombinant protein based on hemagglutinin (HA), a protective viral antigen. A fragment of the HA ectodomain, with a multibasic cleavage site deletion, was expressed in Escherichia coli, refolded, and chromatographically purified from inclusion bodies. Finally, the protein was formulated in Tris-HCl buffer of pH 8.0 or PBS of pH 7.4 to obtain antigens denoted rH5-1 and rH5-2, respectively. The systemic prime and boost immunizations proved that rH5-1 adsorbed to aluminum hydroxide induces anti-H5 HA neutralizing antibodies and protective immune responses against H5N1 HPAIVs in chickens. The present studies were aimed at stimulating immune responses via the mucosal routes using the systemic prime-mucosal boost strategy. Efficacy trials were performed in commercial layer chickens. For systemic and mucosal immunizations, H5 HA antigens were adjuvanted with aluminum hydroxide and chitosan glutamate, respectively. The first dose of rH5-2 was administered subcutaneously, while its second dose was administered subcutaneously, intraocularly, oculo-nasally, or intranasally. rH5-1 was delivered to the subcutaneously primed chickens by the intranasal route. Post-vaccination sera were analyzed for anti-H5 HA antibodies, using homologous ELISA and heterologous FluAC H5 and hemagglutination inhibition tests. Intraocularly and oculo-nasally delivered rH5-2 mixed with chitosan glutamate was capable of stimulating anti-H5 HA IgY antibody responses in the subcutaneously primed chickens; however, it was ineffective when administered by the intranasal route. Efficient intranasal boosting was achieved using rH5-1. The enhanced production of antigen-specific antibodies was reflected in the development of H5-subtype specific and hemagglutination inhibiting antibodies. Conclusively, the subcutaneous prime and oculo-nasal boost vaccination is proposed as the target strategy for future optimization." @default.
• W4221036299 created "2022-04-03" @default.
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• W4221036299 date "2022-05-01" @default.
• W4221036299 modified "2023-10-16" @default.
• W4221036299 title "Chitosan-based formulation of hemagglutinin antigens for oculo-nasal booster vaccination of chickens against influenza viruses" @default.
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• W4221036299 doi "https://doi.org/10.1016/j.vetimm.2022.110406" @default.
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