Development of an in-cell ELISA for the titration of porcine reproductive and respiratory syndrome virus using monoclonal antibodies against its nucleocapsid protein - Shiyu Xu; Xiaojin Chen; Feifei Meng; Ying Zhang; Jiayi Liao; Xiaoyan Zhang; Pengcheng Li; Taotao Yang; Kai Li; Cong Wang; Zhibang Zhang (The Veterinary Journal, 2026)