Figure 2From: Bottlenecks in the transmission of porcine reproductive and respiratory syndrome virus (PRRSV1) to naïve pigs and the quasi-species variation of the virus during infection in vaccinated pigsPreferentially and un-preferred transmitted variants. Mean percentage of variation in nucleotide frequencies along the PRRSV1 genome of the identified preferred or un-preferred transmitted variants in the transmission events between infected and naïve pigs studied (Figure 1B). Only positions with variations larger than 5% are shown.Back to article page