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Porcine reproductive and respiratory syndrome virus (PRRSV) is an emerging pathogen causing significant economic losses in the swine industry worldwide. Two novel gene-deleted viruses were constructed and evaluated as vaccine candidates. Using the full-length infectious cDNA clone of North American PRRS isolate P129, the ORF2 and ORF4 genes (which encoded minor structural glycoproteins GP2a/2b and...
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