Abstract
BackgroundPorcine reproductive and respiratory syndrome (PRRS) is one of the most economically devastating diseases affecting the swine industry globally. Evaluation of antibody responses and neutralizing antibody titers is the most effective method for vaccine evaluation. In this study, the B cell line epitopes of PRRSV M protein were predicted, and two peptide ELISA assays were established (M-A110-129 ELISA, M-A148-174 ELISA) to detect antibodies against PRRSV M protein. Field serum samples collected from pig farms were used to validate the peptide ELISA and compare it with an indirect immunofluorescence assay.ResultsThe sensitivity and specificity of M-A110-129 ELISA and M-A148-174 ELISA were (111/125) 88.80%, (69/70) 98.57% and (122/125) 97.60%, (70/70) 100%, relative to indirect immunofluorescence assay. This peptide ELISA could detect antibodies against different genotypes of PRRSV including type 1 PRRSV, classical PRRSV, HP-PRRSV, and NADC30 like PRRSV, but not antibodies against other common swine viruses. The results of ROC analysis showed that the area under the curve (AUC) of the M-A110-129 ELISA and M-A148-174 ELISA were 0.967 and 0.996, respectively. Compared the concordance of results using two peptide ELISA assays, the IDEXX PRRSV X3 Ab ELISA and a virus neutralization test, were assessed using a series of 147 sera from pigs vaccinated with the NADC30-like PRRSV inactivated vaccine. The M-A148-174 ELISA had the best consistency, with a Cohen’s kappa coefficient of 0.8772. The concordance rates of the Hipra PRRSV ELISA kit, M-A110-129 ELISA and M-A148-174 ELISA in the field seropositive detection results were 91.08, 86.32 and 95.35%, relative to indirect immunofluorescence assay.ConclusionsIn summary, compared with M-A110-129 ELISA, the PRRSV M-A148-174 ELISA is of value for detecting antibodies against PRRSV and the evaluation of the NADC30-like PRRSV inactivated vaccine, but the advantage is insufficient in serological early diagnosis.
Highlights
Porcine reproductive and respiratory syndrome (PRRS) is one of the most economically devastating diseases affecting the swine industry globally
Porcine reproductive and respiratory syndrome virus (PRRSV) M protein analysis and B cell line epitopes prediction The M protein amino acid of HP-PRRSV and NADC30like PRRSV strains sequence alignment showed that aa5 L-I, aa10 H-N, aa15 P-V, aa29 V-I, aa63 A-V, aa66 E-Q, aa70 R-K, aa89 I-M, aa93 K-R, aa126 A-T, aa128 N-S, aa151 L-F, aa159 R-S, aa160 K-R and aa164 Q-R were replaced (Fig. 1A)
The 6 B cell epitopes with different lengths of PRRSV M protein were predicted on the Immune Epitope Database (IEDB) (Table S2)
Summary
Porcine reproductive and respiratory syndrome (PRRS) is one of the most economically devastating diseases affecting the swine industry globally. Porcine reproductive and respiratory syndrome virus (PRRSV) is the causative agent of porcine reproductive and respiratory syndrome (PRRS) It is an economically devastating pandemic disease of swine that mainly infect the respiratory system and reproductive system [1]. The N protein of PRRSV has the highest immunogenicity among all structural proteins, but the N protein antibody produced by the host does not neutralize the virus. Antibodies produced by the host in the early stage of PRRSV infection are mainly against the N protein, and antibodies against the N protein can be detected 1 week after infection [8]. The M protein is a non-glycosylated membrane matrix protein encoded by ORF6. It has strong immunogenicity and contains a large number of antigenic epitopes [12, 13]. Specific antibodies against the M protein can be detected in the early stage of virus infection, and the antibody level remains stable for a long time [14]
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