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Lineage identification of multiple introductions of Thai PRRSVs. The phylogenetic trees were constructed in MrBayes and were mid-point rooted. For clarity, only the bootstrap values of selected and well-supported nodes were shown. (A) Thai Type 1 PRRSVs and (B) Thai Type 2 PRRSV on global context show multiple introductions. Blue arrows and colored rectangles show different lineages of Thai PRRSVs.
