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This experiment aims to compare the efficacy of porcine reproductive and respiratory syndrome (PRRS) vaccine using North America and European genotypes attenuated vaccines including determine the correlation of enzyme-linked immunosorbent assay (ELISA) kit tests for antibody detection using LSIVetTM Porcine PRRS/EU-Serum (LSI-EU; LSI, France), LSIVetTM Porcine PRRS/US-Serum (LSI-US; LSI, France) and IDEXX PRRS X3 Ab Test (IDEXX®, USA). The antibody level of North America strain vaccinated group was rather steady during the first 6-weeks-post vaccination then increasing and steady until slaughtering. For European strain vaccinated group, was decrease up to 4 weeks post vaccination then increasing and steady until slaughtering. These data suggest that North American genotype vaccinated group have a tendency better than European genotype vaccinated group in term maintain the maternal immunity after vaccination, onset duration of antibody increasing and maintain high level of immunity until slaughtering. In addition, present study was compared the correlation between 2 groups of commercial ELISA test kits for PRRS antibody detection such as IDEXX that detects both NA and EU genotypes, and LSI’s test kits that were developed to detect specifically either antibodies NA or EU strains of PRRS viruses. The correlation between LSI-EU and LSI-US compared with IDEXX, was showed in Kappa (κ) value as 0.9097, interpreted as almost perfect agreement. And the degree of linear association between both LSIs and IDEXX were use a correlation coefficient as 0.513 (p≤0.01), indicated that both ELISA test kit was moderate correlation. The explanation for these results that both types of LSIVetTM ELISA test kit for PRRS antibody detection could be tested as same as IDEXX.
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