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Porcine reproductive and respiratory syndrome virus (PRRSV) is renowned for its genetic, antigenic, and pathogenic heterogeneity. As a consequence, highly pathogenic PRRSV (HP-PRRSV) has emerged and caused tremendous economic losses in the swine industry. In this study, a Chinese HP-PRRSV JX143 isolate was serially passaged in MARC-145 cells up to 100 times. We found that phenotypic changes involved...
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