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A pseudorabies virus (PRV) variant with enhanced pathogenicity has emerged in many vaccinated swine herds in China since 2011. rPRVTJ-delgE/gI, a previously described gE/gI-deleted PRV based on the PRV variant TJ strain, has been shown to be avirulent to pigs yet virulent to sheep. To ensure desirable biosafety, we further deleted the thymidine kinase (TK) gene of rPRVTJ-delgE/gI to generate a gE/gI/TK-deleted...
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