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PCV2 CP(160–233)/CP(43–233) ratio at 42 days after coinfection. Sera were analyzed for anti-PCV2 CP antibodies. The serum antibody ratio was calculated as the MFI for reactivity with the CP(160–233) decoy epitope divided by the MFI for the CP(43–233) conformational antigen. The difference between the means for the PRRSV-vaccinated and nonvaccinated groups was significant (P = 0.0006 by Student's t test).
