The number of sequences showed an increasing trend since 2006, within the range of 24 to 118 from 2007 to 2018 ( Fig. 1B ).
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Analysis of Recombinant Characteristics Based on 949 PRRSV-2 Genomic Sequences Obtained from 1991 to 2021 Shows That Viral Multiplication Ability Contributes to Dominant Recombination.
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