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Phylogenetic relationship of 83 PRRSV field isolates with the vaccine viruses (MLV, ATP) and their parental viruses (VR2332, JA142) based on ORF5 nucleotide sequence. Boldface and asterisks indicate isolates whose infections were significantly affected by VR2332 or JA142 antiserum. The symbol + indicates VLVs, which produced medium- to big-sized plaques. The reliability of analysis was determined by 1,000-times-repeated bootstraps.
