Figure 3From: Vaccination of sows against type 2 Porcine Reproductive and Respiratory Syndrome Virus (PRRSV) before artificial insemination protects against type 2 PRRSV challenge but does not protect against type 1 PRRSV challenge in late gestationMean values of the genomic copies of PRRSV RNA in serum in different treatment groups. Sows that received PRRSV vaccine followed by type 1 PRRSV challenge (group 1, □); sows that received PRRSV vaccine followed by type 2 PRRSV challenge (group 2, ■); non-vaccinated sows challenged with type 1 PRRSV (group 3, ○); and non-vaccinated sows challenged with type 2 PRRSV (group 4, ●). *Significant (P < 0.05) difference between group 2 and group 4.Back to article page