Fig. 2From: Prevalence and genetic evolution of porcine reproductive and respiratory syndrome virus in commercial fattening pig farms in ChinaStatistical analysis of PRRSV subtypes in seven commercial fattening pig farms. a The number of subtypes and the number of samples in each subtype. b Proportion of PRRSV subtypes. Subtypes are represented by different colours. The positive samples and percentage of L1.8 (L1C) PRRSV is shown at the top of the bar chartBack to article page