Porcine reproductive and respiratory syndrome (PRRS) is a
swine disease which appeared simultaneously in Europe (early
1990s) and North America (late 1980s) [1,2] and continues to be
one of the major diseases that affect the swine industry
worldwide, being responsible for losses of $664 million
annually in U.S.A national breeding and growing pig herds [3,4].
PRRS is caused by a virus (PRRSV), which belongs to the
family Arteriviridae, genus Arterivirus [5]. Generally, PRRSV is
divided into two major genotypes, the type I (European) and
Porcine reproductive and respiratory syndrome (PRRS) is aswine disease which appeared simultaneously in Europe (early1990s) and North America (late 1980s) [1,2] and continues to beone of the major diseases that affect the swine industryworldwide, being responsible for losses of $664 millionannually in U.S.A national breeding and growing pig herds [3,4].PRRS is caused by a virus (PRRSV), which belongs to thefamily Arteriviridae, genus Arterivirus [5]. Generally, PRRSV isdivided into two major genotypes, the type I (European) and
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