Fig. 4From: Prevalence and genetic evolution of porcine reproductive and respiratory syndrome virus in commercial fattening pig farms in ChinaPhylogenetic analysis based on the ORF5 gene of L1.8(L1C) PRRSV. Neighbour-joining trees based on ORF5 and bootstrap values at the nodes are based on 1000 replicates. L1.8(L1C) PRRSVS from different commercial fattening pig farms are represented in different coloursBack to article page