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Porcine reproductive and respiratory syndrome virus: seminal transmission

PORCINE reproductive and respiratory syndrome is a highly contagious viral disease present in pig populations in North America and Europe (Collins and others 1992). The signs of the disease are reproductive failure, including abortion, stillbirth and neonatal death, and respiratory disease in piglets (Pol and others 1991). Genome organisation, strategy of gene expression and the sequence of deduced proteins show that porcine reproductive and respiratory syndrome virus (PRRSV) belongs to the arterivirus