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Detection of porcine reproductive and respiratory syndrome virus (PRRSV)-specific N protein antibody and neutralization antibody in each group. (A) N protein antibody level after vaccination and data are expressed as mean ± SD (error bars); Neutralization antibody titers against HuN4-F112 (B), VR2332 MLV (C), and ZJnb16-2 (D) of serum collected at 28 days post vaccination (DPV), 7 DPC, 14 DPC, and 21 DPC.
