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Table 2 Results of PRRSV antibody ELISA in the study piglets

From: Efficacy of live attenuated porcine reproductive and respiratory syndrome virus 2 strains to protect pigs from challenge with a heterologous Vietnamese PRRSV 2 field strain

  No. of positive piglets
Study day −42 −21 0 3 7 10 14 21 28
Group 1 0 9 10 10 10 10 10 9 9
Group 2 0   0 0 0 6 10 10 10
  1. Group 1 – pre-vaccinated with an experimental PRRSV 2 live vaccine
  2. Group 2 – not pre-vaccinated