Polyethylenimine-coated PLGA nanoparticles-encapsulated Angelica sinensis polysaccharide as an adjuvant for H9N2 vaccine to improve immune responses in chickens compared to Alum and oil-based adjuvants

Pengfei Gu, Adelijiang Wusiman, Yue Zhang, Gaofeng Cai, Shuwen Xu, Shaowu Zhu, Zhenguang Liu, Yuanliang Hu, Jiaguo Liu, Deyun Wang