Fig. 2From: Vaccination of 1-day-old pigs with a porcine reproductive and respiratory syndrome virus (PRRSV) modified live attenuated virus vaccine is able to overcome maternal immunityMean ELISA S/P ratio at vaccination (D0), at challenge (DC) and at necropsy (DC + 10); ELISA positive: S/P ratio ≥ 0,4Back to article page